WorldWideScience

Sample records for resin-treated polyester fabrics

  1. Properties of honeycomb polyester knitted fabrics

    Science.gov (United States)

    Feng, A. F.

    2016-07-01

    The properties of honeycomb polyester weft-knitted fabrics were studied to understand their advantages. Seven honeycomb polyester weft-knitted fabrics and one common polyester weft-knitted fabric were selected for testing. Their bursting strengths, fuzzing and pilling, air permeability, abrasion resistance and moisture absorption and perspiration were studied. The results show that the honeycomb polyester weft-knitted fabrics have excellent moisture absorption and liberation. The smaller their thicknesses and area densities are, the better their moisture absorption and liberation will be. Their anti-fuzzing and anti-pilling is good, whereas their bursting strengths and abrasion resistance are poorer compared with common polyester fabric's. In order to improve the hygroscopic properties of the fabrics, the proportion of the honeycomb microporous structure modified polyester in the fabrics should not be less than 40%.

  2. Bacterial contamination of nurses' white coats made from polyester and polyester cotton blend fabrics.

    Science.gov (United States)

    Gupta, P; Bairagi, N; Priyadarshini, R; Singh, A; Chauhan, D; Gupta, D

    2016-09-01

    In India, nurses wear white coats over their uniform. In this small study, patches of polyester and polyester cotton blend fabrics were attached to the white coats of nurses and sampled for contamination after one shift. Results showed that microbial adhesion is influenced by fabric type, with the microbial load on the polyester cotton blend fabric being 60% higher than that on the polyester fabric. Further studies need to be conducted to establish the correlation between fabric properties and microbial contamination.

  3. Studies on Wicking Behaviour of Polyester Fabric

    Directory of Open Access Journals (Sweden)

    Arobindo Chatterjee

    2014-01-01

    Full Text Available This paper aims to investigate vertical wicking properties of polyester fabric based on change in sample direction and change in tension. Also experimental results are compared with theoretical results. Polyester fabric made out of spun yarn with four types of variation in pick density was used. Theoretical values of vertical wicking were calculated by using Lucas-Washburn equation and experimental results were recorded using strip test method. Maximum height reached experimentally in both warp way and weft way is more than that of the theoretical values. The maximum height attained by fabric experimentally in weft is more as compared to warp way. Vertical wicking increases with increase in tension. This paper is focused on wicking which plays a vital role in determining comfort and moisture transport behavior of fabric.

  4. Compression Properties of Polyester Needlepunched Fabric

    Directory of Open Access Journals (Sweden)

    Sanjoy Debnath, Ph.D.

    2009-12-01

    Full Text Available In the present paper, a study of the effects of fabricweight, fiber cross-sectional shapes (round, hollowand trilobal and presence of reinforcing materialon the compression properties (initial thickness,percentage compression, percentage thickness lossand percentage compression resilience of polyesterneedle punched industrial nonwoven fabrics ispresented. It was found that for fabrics with noreinforcing material, the initial thickness,compression, and thickness loss were higher thanfabrics with reinforcing material, irrespectiveoffiber cross-section. Compression resilience datashowed the reverse trend. Initial thickness fortrilobal cross-sectional fabric sample was highestfollowed by round and hollow cross-sectionedpolyester needle punched fabrics. The polyesterfabric made from hollow cross-sectioned fibersshowed the least percentage compression at everylevel of fabric weights. The trilobal cross-sectionedpolyester fabric sample showed higher thicknessloss followed by round and hollow cross-sectionedpolyester fabric samples respectively. The hollowcross-sectioned polyester fabric samples showedmaximum compression resilience followed byround and trilobal cross-sectioned polyestersamples irrespective of fabric weights. The initialthickness increases, but percentage compression,thickness loss and compression resilience decreaseswith the increase in fabric weight irrespective offiber cross-sectional shapes.

  5. Dot-ELISA for the detection of anti-Cysticercus cellulosae antibodies in cerebrospinal fluid using a new solid phase (resin-treated polyester fabric and Cysticercus longicollis antigens Teste dot-ELISA para detecção de anticorpos anti-Cysticercus cellulosae em líquido cefalorraquiano utilizando um novo suporte (tecido de poliéster-resina e antígenos de Cysticercus longicollis

    Directory of Open Access Journals (Sweden)

    Adelaide José Vaz

    1996-12-01

    Full Text Available A dot-ELISA was developed for the detection of antibodies in CSF in the immunologic diagnosis of human neurocysticercosis, using antigen extracts of the membrane and scolex of Cysticercus cellulosae (M+S-Cc and, alternately, membrane (M and vesicular fluid (VF of Cysticercus longicollis (Cl covalently bound to a new solid phase consisting of polyester fabric treated with N-methylol-acrylamide resin (dot-RT. The test was performed at room temperature, with reduced incubation times and with no need for special care in the manipulation of the support. The sensitivity rates obtained were 95.1% for antigen Cc and 97.6% for antigen Cl. Specificity was 90.6% when Cc was used, and 96.9% and 100% when M-Cl and VF-Cl were used, respectively. No significant differences in titer were observed between tests carried out with homologous and heterologous antigens. The low cost and easy execution of the dot-RT test using antigen extracts of Cysticercus longicollis indicate the test for use in the immunodiagnosis of human neurocysticercosis.Foi desenvolvido o teste dot-ELISA para detecção de anticorpos em líquido cefalorraquiano (LCR no diagnóstico imunológico da neurocisticercose humana, utilizando antígenos de membrana e escólex de Cysticercus cellulosae (M+E-Cc e, alternativamente, membrana (M e líquido vesicular (LV de Cysticercus longicollis (Cl covalentemente ligados a um novo suporte constituído de tecido de poliéster-resina de N-metilol-acrilamida (dot-TR. O teste foi realizado à temperatura ambiente, com tempos de incubação reduzidos e sem necessidade de cuidados na manipulação do suporte. A sensibilidade obtida foi de 95,1% para o antígeno Cc e 97,6% para o Cl. A especificidade foi de 90,6% quando o antígeno Cc foi usado, e 96,9% e 100% para M-Cl e LV-Cl, respectivamente. Não foi observada diferença significativa entre os antígenos homólogo e heterólogo. O baixo custo e a fácil execução do teste dot-TR empregando extratos antig

  6. Study on the improvement of hydrophilic character on polyvinylalcohol treated polyester fabric

    OpenAIRE

    S. Pitchai; J. Jeyakodi Moses; Natarajan Swarna

    2014-01-01

    Polyester fabric was treated with polyvinyl alcohol in alkaline medium. The moisture regain, water retention and wettability of the PVA treated polyester fabric were tested. The PVA treated PET fabric was dyed with disperse dye. The presence of PVA in the treated PET fabric was assessed by spot test. The treated fabric was also characterized by scanning electron microscope, FTIR and differential scanning calorimetry. The PVA treated polyester fabric showed improved hydrophilic character over ...

  7. A facile fabrication of multifunctional knit polyester fabric based on chitosan and polyaniline polymer nanocomposite

    Energy Technology Data Exchange (ETDEWEB)

    Tang, Xiaoning [College of Textiles, Qingdao University, Qingdao, Shandong 266071 (China); Laboratory of New Fiber Materials and Modern Textile, The Growing Base for State Key Laboratory, Qingdao University, Qingdao, Shandong 266071 (China); Tian, Mingwei [College of Textiles, Qingdao University, Qingdao, Shandong 266071 (China); Laboratory of New Fiber Materials and Modern Textile, The Growing Base for State Key Laboratory, Qingdao University, Qingdao, Shandong 266071 (China); Collaborative Innovation Center for Marine Biomass Fibers, Materials and Textiles of Shandong Province, Qingdao University, Qingdao, Shandong 266071 (China); Qu, Lijun, E-mail: lijunqu@126.com [College of Textiles, Qingdao University, Qingdao, Shandong 266071 (China); Laboratory of New Fiber Materials and Modern Textile, The Growing Base for State Key Laboratory, Qingdao University, Qingdao, Shandong 266071 (China); Collaborative Innovation Center for Marine Biomass Fibers, Materials and Textiles of Shandong Province, Qingdao University, Qingdao, Shandong 266071 (China); Zhu, Shifeng [College of Textiles, Qingdao University, Qingdao, Shandong 266071 (China); Laboratory of New Fiber Materials and Modern Textile, The Growing Base for State Key Laboratory, Qingdao University, Qingdao, Shandong 266071 (China); Guo, Xiaoqing [College of Textiles, Qingdao University, Qingdao, Shandong 266071 (China); Laboratory of New Fiber Materials and Modern Textile, The Growing Base for State Key Laboratory, Qingdao University, Qingdao, Shandong 266071 (China); Collaborative Innovation Center for Marine Biomass Fibers, Materials and Textiles of Shandong Province, Qingdao University, Qingdao, Shandong 266071 (China); Han, Guangting [Laboratory of New Fiber Materials and Modern Textile, The Growing Base for State Key Laboratory, Qingdao University, Qingdao, Shandong 266071 (China); Collaborative Innovation Center for Marine Biomass Fibers, Materials and Textiles of Shandong Province, Qingdao University, Qingdao, Shandong 266071 (China); and others

    2014-10-30

    Highlights: • Multifunctional knit polyester fabric was facile fabricated by the combination of pad-dry-cure process and in situ chemical polymerization route. • High electrical conductivity and efficient water-repellent properties were endowed to the polymer nanocomposite coated fabric. • The polymer nanocomposite coated fabric also performed efficient and durable photocatalytic activities under the illumination of ultraviolet light. - Abstract: Knit polyester fabric was successively modified and decorated with chitosan layer and polyaniline polymer nanocomposite layer in this paper. The fabric was firstly treated with chitosan to form a stable layer through the pad-dry-cure process, and then the polyaniline polymer nanocomposite layer was established on the outer layer by in situ chemical polymerization method using ammonium persulfate as oxidant and chlorhydric acid as dopant. The surface morphology of coated fabric was characterized by scanning electron microscopy (SEM), and the co-existence of chitosan layer and granular polyaniline polymer nanocomposite was confirmed and well dispersed on the fabric surface. The resultant fabric was endowed with remarkable electrical conductivity properties and efficient water-repellent capability, which also have been found stable after water laundering. In addition, the photocatalytic decomposition activity for reactive red dye was observed when the multifunctional knit polyester fabric was exposed to the illumination of ultraviolet lamp. These results indicated that chitosan and polyaniline polymer nanocomposite could form ideal multifunctional coatings on the surface of knit polyester fabric.

  8. Thiophene based monoazo disperse dyes for polyester fabric

    Directory of Open Access Journals (Sweden)

    VITHAL SOMA PATEL

    2002-01-01

    Full Text Available A series of monoazo disperse dyes have been prepared by coupling 2-amino-3-carbethoxy-4,5-dimethylthiophene with various N-arylmaleimides. The monoazo disperse dyes were characterised by IR spectral studies and elemental analysis. These dyes were applied at 2 % depth on polyester fabrics and gave light yellow to brown colour hues with fair fastness to light and very good to excellent fastness to washing, rubbing, perspiration and sublimation. The percentage exhaustion of the dyebath and fixation on the fabric were found to be very good.

  9. Fabrication of Biodegradable Polyester Nanocomposites by Electrospinning for Tissue Engineering

    Directory of Open Access Journals (Sweden)

    Zhi-Cai Xing

    2011-01-01

    Full Text Available Recently, nanocomposites have emerged as an efficient strategy to upgrade the structural and functional properties of synthetic polymers. Polyesters have attracted wide attention because of their biodegradability and biocompatibility. A logic consequence has been the introduction of natural extracellular matrix (ECM molecules, organic or inorganic nanostructures to biodegradable polymers to produce nanocomposites with enhanced properties. Consequently, the improvement of the interfacial adhesion between biodegradable polymers and natural ECM molecules or nanostructures has become the key technique in the fabrication of nanocomposites. Electrospinning has been employed extensively in the design and development of tissue engineering scaffolds to generate nanofibrous substrates of synthetic biodegradable polymers and to simulate the cellular microenvironment. In this paper, several types of biodegradable polyester nanocomposites were prepared by electrospinning, with the aim of being used as tissue engineering scaffolds. The combination of biodegradable nanofibrous polymers and natural ECM molecules or nanostructures opens new paradigms for tissue engineering applications.

  10. Study on the improvement of hydrophilic character on polyvinylalcohol treated polyester fabric

    Directory of Open Access Journals (Sweden)

    S. Pitchai

    2014-12-01

    Full Text Available Polyester fabric was treated with polyvinyl alcohol in alkaline medium. The moisture regain, water retention and wettability of the PVA treated polyester fabric were tested. The PVA treated PET fabric was dyed with disperse dye. The presence of PVA in the treated PET fabric was assessed by spot test. The treated fabric was also characterized by scanning electron microscope, FTIR and differential scanning calorimetry. The PVA treated polyester fabric showed improved hydrophilic character over intact and sodium hydroxide treated PET fabrics.

  11. Dyeing of Polyester with Disperse Dyes: Part 2. Synthesis and Dyeing Characteristics of Some Azo Disperse Dyes for Polyester Fabrics

    Directory of Open Access Journals (Sweden)

    Alya M. Al-Etaibi

    2016-06-01

    Full Text Available The goal of this study was to utilize carrier for accelerating the rate of dyeing not only to enhance dyeing of polyester fabrics dyed with disperse dyes 3a,b, but also to save energy. Both the color strength expressed as dye uptake and the fastness properties of the dyed fabrics were evaluated.

  12. A facile fabrication of multifunctional knit polyester fabric based on chitosan and polyaniline polymer nanocomposite

    Science.gov (United States)

    Tang, Xiaoning; Tian, Mingwei; Qu, Lijun; Zhu, Shifeng; Guo, Xiaoqing; Han, Guangting; Sun, Kaikai; Hu, Xili; Wang, Yujiao; Xu, Xiaoqi

    2014-10-01

    Knit polyester fabric was successively modified and decorated with chitosan layer and polyaniline polymer nanocomposite layer in this paper. The fabric was firstly treated with chitosan to form a stable layer through the pad-dry-cure process, and then the polyaniline polymer nanocomposite layer was established on the outer layer by in situ chemical polymerization method using ammonium persulfate as oxidant and chlorhydric acid as dopant. The surface morphology of coated fabric was characterized by scanning electron microscopy (SEM), and the co-existence of chitosan layer and granular polyaniline polymer nanocomposite was confirmed and well dispersed on the fabric surface. The resultant fabric was endowed with remarkable electrical conductivity properties and efficient water-repellent capability, which also have been found stable after water laundering. In addition, the photocatalytic decomposition activity for reactive red dye was observed when the multifunctional knit polyester fabric was exposed to the illumination of ultraviolet lamp. These results indicated that chitosan and polyaniline polymer nanocomposite could form ideal multifunctional coatings on the surface of knit polyester fabric.

  13. Plasma treatment of polyester fabric to impart the water repellency property

    Indian Academy of Sciences (India)

    C J Jahagirdar; L B Tiwari

    2007-04-01

    Polyester fabric is treated with DCDMS solution by two methods: dipping the fabric directly in DCDMS solution for different intervals and dipping the fabric in DCDMS solution after its exposure into RF plasma chamber for different durations at optimized exposure power conditions. The physical properties of polyester fabric treated with DCDMS in the presence or absence of air plasma have been compared with control fabric. Different characterization techniques like scanning electron microscope, attenuated total reflectance-IR and Dataflash 100 colour measurement spectrophotometer are used to assess the surface morphology, composition and change in colour parameters. Water repellency property of both untreated and modified polyester fabric is studied using AATCC test method 39 (1971). The effectiveness of the water repellency property of modified polyester fabric is checked by repeated washing up to ten cycles.

  14. Enhancement of Adhesion between EPDM and Polyester Fabric by Using Natural Rubber Modified by Maleic Anhydride

    Directory of Open Access Journals (Sweden)

    A. A. El-Wakil

    2011-01-01

    Full Text Available This study presents a new method for improving adhesion between ethylene propylene diene monomer (EPDM rubber and polyester fabric. In this work, natural rubber was modified by maleic anhydride in order to improve the adhesion force between ethylene propylene diene monomer rubber and polyester fabric. The effect of thermal aging and ionizing radiation on the stability of the rubber mix as well as on the peel strength of the rubber-coated fabric was investigated. It was observed that the natural rubber modified by maleic anhydride improved the peel strength of the EPDM rubber-coated polyester fabric.

  15. The antifungal activity of corona treated polyamide and polyester fabrics loaded with silver nanoparticles

    Science.gov (United States)

    Saponjic, Z.; Ilic, V.; Vodnik, V.; Mihailovic, D.; Jovancic, P.; Nedeljkovic, J.; Radetic, M.

    2008-07-01

    This study is aimed to highlight the possibility of using the corona treatment for fiber surface activation that can facilitate the loading of silver nanoparticles from colloids onto the polyester and polyamide fabrics and thus enhance their antifungal activity against Candida albicans. Additionally, the laundering durability of achieved effects was studied. Corona activated polyamide and polyester fabrics loaded with silver nanoparticles showed better antifungal properties compared to untreated fabrics. The positive effect of corona treatment became even more prominent after 5 washing cycles, especially for polyester fabrics.

  16. Characterizing the sorption of polybrominated diphenyl ethers (PBDEs) to cotton and polyester fabrics under controlled conditions

    Energy Technology Data Exchange (ETDEWEB)

    Saini, Amandeep [Department of Physical and Environmental Sciences, University of Toronto Scarborough, 1265 Military trail, Toronto, ON M1C 1A4 (Canada); Rauert, Cassandra [School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham B15 2TT (United Kingdom); Simpson, Myrna J. [Department of Physical and Environmental Sciences, University of Toronto Scarborough, 1265 Military trail, Toronto, ON M1C 1A4 (Canada); Harrad, Stuart [School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham B15 2TT (United Kingdom); Diamond, Miriam L., E-mail: miriam.diamond@utoronto.ca [Department of Earth Sciences, 22 Russell Street, University of Toronto, Toronto, ON M5S 3B1 (Canada); Department of Physical and Environmental Sciences, University of Toronto Scarborough, 1265 Military trail, Toronto, ON M1C 1A4 (Canada)

    2016-09-01

    Cotton and polyester, physically and chemically different fabrics, were characterized for sorption of gas-phase polybrominated diphenyl ethers (PBDEs). Scanning electron microscopic (SEM) images and BET specific surface area (BET-SSA) analysis showed cotton's high microsurface area; NMR analysis showed richness of hexose- and aromatic-carbon in cotton and polyester, respectively. Cotton and polyester sorbed similar concentrations of gas-phase PBDEs in chamber studies, when normalized to planar surface area. However, polyester concentrations were 20–50 times greater than cotton when normalized to BET-SSA, greater than the 10 times difference in BET-SSA. The difference in sorption between cotton and polyester is hypothesized to be due to ‘dilution’ due to cotton's large BET-SSA and/or greater affinity of PBDEs for aromatic-rich polyester. Similar fabric-air area normalized distribution coefficients (K'{sub D}, 10{sup 3} to 10{sup 4} m) for cotton and polyester support air-side controlled uptake under non-equilibrium conditions. K'{sub D} values imply that 1 m{sup 2} of cotton or polyester fabrics would sorb gas-phase PBDEs present in 10{sup 3} to 10{sup 4} m{sup 3} of equivalent air volume at room temperature over one week, assuming similar air flow conditions. Sorption of PBDEs to fabrics has implications for their fate indoors and human exposure. - Highlights: • Sorption of gas-phase PBDEs by cotton and polyester fabrics • Similar sorption to cotton and polyester per unit planar surface area • Greater sorption by polyester/BET-SSA; cotton's dilution or polyester’s affinity • 1 m{sup 2} fabric sorbs PBDEs in 10{sup 3} to 10{sup 4} m{sup 3} of equivalent air volume • Clothing likely a large indoor sink of PBDEs and influence human exposure.

  17. Dyeing of UV irradiated cotton and polyester fabrics with multifunctional reactive and disperse dyes

    Directory of Open Access Journals (Sweden)

    Ijaz Ahmad Bhatti

    2016-03-01

    Full Text Available The dyeing behaviour of UV irradiated cotton and polyester fabrics using multifunctional reactive and disperse dyes has been investigated. The plain, woven, mercerized, bleached, cotton and polyester fabrics were exposed to UV radiation (180 w, 254 nm for 30, 60, 90 and 120 min. Dyeing was performed using irradiated fabric with a dye solution of un-irradiated reactive and disperse/azo dyes. The dyeing parameters such as, temperature, time, pH and salt concentration have been optimized. The colour strength values of dyed fabrics were evaluated by comparing irradiated and un-irradiated cotton and polyester fabrics in CIE Lab systems using spectra flash SF600. Finally ISO standard methods were employed to observe the effect of UV radiation on fastness properties. It was found that UV radiation has a potential to improve the colour strength values of cotton and polyester fabrics by using reactive and disperse dyes.

  18. Research of Kinetics of Electroless Ni-Cu-P Alloy Plating on Polyester Fabric

    Institute of Scientific and Technical Information of China (English)

    CHEN Zhen-bing; CHEN Xiao-li

    2002-01-01

    All the variables that may affect the Ni- Cu-P alloy deposition rate on polyester fabric were studied, and the activation energy and the reaction orders were determined. The deposition rate equation was also derived.

  19. Eco-friendly surface modification on polyester fabrics by esterase treatment

    Science.gov (United States)

    Wu, Jindan; Cai, Guoqiang; Liu, Jinqiang; Ge, Huayun; Wang, Jiping

    2014-03-01

    Currently, traditional alkali deweighting technology is widely used to improve the hydrophilicity of polyester fabrics. However, the wastewater and heavy chemicals in the effluent cause enormous damage to the environment. Esterase treatment, which is feasible in mild conditions with high selectivity, can provide a clean and efficient way for polyester modification. Under the optimum conditions, the polyester fabric hydrolysis process of esterase had a linear kinetics. X-ray photoelectron spectrometry (XPS) results showed that hydroxyl and carboxyl groups were produced only on the surface of modified fiber without changing the chemical composition of the bulk. These fibers exhibited much improved fabric wicking, as well as greatly improved oily stain removal performance. Compared to the harsh alkali hydrolysis, the enzyme treatment led to smaller weight loss and better fiber integrity. The esterase treatment technology is promising to produce higher-quality polyester textiles with an environmental friendly approach.

  20. Design and fabrication of an E-shaped wearable textile antenna on PVB-coated hydrophobic polyester fabric

    Science.gov (United States)

    Babu Roshni, Satheesh; Jayakrishnan, M. P.; Mohanan, P.; Peethambharan Surendran, Kuzhichalil

    2017-10-01

    In this paper, we investigated the simulation and fabrication of an E-shaped microstrip patch antenna realized on multilayered polyester fabric suitable for WiMAX (Worldwide Interoperability for Microwave Access) applications. The main challenges while designing a textile antenna were to provide adequate thickness, surface uniformity and water wettability to the textile substrate. Here, three layers of polyester fabric were stacked together in order to obtain sufficient thickness, and were subsequently dip coated with polyvinyl butyral (PVB) solution. The PVB-coated polyester fabric showed a hydrophobic nature with a contact angle of 91°. The RMS roughness of the uncoated and PVB-coated polyester fabric was about 341 nm and 15 nm respectively. The promising properties, such as their flexibility, light weight and cost effectiveness, enable effortless integration of the proposed antenna into clothes like polyester jackets. Simulated and measured results in terms of return loss as well as gain were showcased to confirm the usefulness of the fabricated prototype. The fabricated antenna successfully operates at 3.37 GHz with a return loss of 21 dB and a maximum measured gain of 3.6 dB.

  1. Functional polyester fabric through simultaneous aminolysis and nano ZnO synthesis

    Directory of Open Access Journals (Sweden)

    Hajar Poortavasoly

    2014-12-01

    Full Text Available Here, in situ synthesis of nano zinc oxide, along with aminolysis of polyester fabric, has simultaneously been carried out by using triethanol amine (TEA and zinc acetate. The ZnO nano particles (NPs were formed and stabilized on the fabric surface by amine compound at 130 °C for 1 h. The synthesis of nano ZnO particles on the polyester fabric were confirmed by X-ray diffraction (XRD patterns and scanning electron microscopy (SEM images. The mean size of ZnO NP was obtained with SEM about 51.38 nm, however, XRD data indicated the crystalline ZnO NPs with a mean crystal size of 14.68 nm on the fabric surface. Further, self-cleaning performance of the treated fabrics was studied by degradation of methylene blue (MB in aqueous solution under daylight irradiation. The stability of ZnO NPs on the fabric surface was studied by evaluating the self-cleaning and hydrophilicity properties of the samples after standard washing. Also, the hydrophilicity of the treated polyester fabric was improved due to aminolysis of the fabric and the required time for water droplet to spread on the treated fabric after one week exposure to daylight reduced. Overall, TEA was a suitable reducing agent to prepare homogenous ZnO NPs on the polyester fabric.

  2. Optimizing the Dyeing Process of Alkali-Treated Polyester Fabric with Dolu Natural Dye

    OpenAIRE

    M. F. Shahin; Ahmed, R. M.

    2014-01-01

    An attempt has been made to optimize the process of dyeing polyester (PET) fabric with natural dyes. Polyester has been first treated with NaOH solution in order to study its impact on the dyeability to the natural dye. The required and used colour component was extracted from a natural plant, namely: Rhubarb; Rheum officinale. The chemical structure of the used colouring matter is observed to have all the characteristics of a typical disperse dye. The colour strength of PE...

  3. Research on the Dyeing Properties of Silk-like Knitted Fabric of Ultrafine Polyester Fiber

    Institute of Scientific and Technical Information of China (English)

    XU Rui-chao; DING Yan-rui; WANG Hong

    2005-01-01

    In this paper, dyeing processes of silk-like fabric of ultrafine polyester fiber are studied through orthogonal experiment, dyeing properties (K/S value, L* value, and C* value) of the fabric are tested under different dyeing conditions (pH value, time, and bath ratio), and optimum dyeing conditions are arrived at through analysis.

  4. Eco-friendly surface modification on polyester fabrics by esterase treatment

    Energy Technology Data Exchange (ETDEWEB)

    Wu, Jindan; Cai, Guoqiang; Liu, Jinqiang; Ge, Huayun; Wang, Jiping, E-mail: jipingwanghz@gmail.com

    2014-03-01

    Graphical abstract: - Highlights: • We used a simple and easy way to measure the enzyme activity. • We studied the mechanism by characterizing the chemical changes in the surface of fabric. • We studied the advantages in surface wettability, fiber integrity and mechanical performance of cutinase treated fabrics. • Cutinase pretreated fibers exhibited much improved fabric wicking and better fiber integrity comparing to alkali treated ones. • Cutinase pretreatment technology promotes energy conservation and emission reduction. - Abstract: Currently, traditional alkali deweighting technology is widely used to improve the hydrophilicity of polyester fabrics. However, the wastewater and heavy chemicals in the effluent cause enormous damage to the environment. Esterase treatment, which is feasible in mild conditions with high selectivity, can provide a clean and efficient way for polyester modification. Under the optimum conditions, the polyester fabric hydrolysis process of esterase had a linear kinetics. X-ray photoelectron spectrometry (XPS) results showed that hydroxyl and carboxyl groups were produced only on the surface of modified fiber without changing the chemical composition of the bulk. These fibers exhibited much improved fabric wicking, as well as greatly improved oily stain removal performance. Compared to the harsh alkali hydrolysis, the enzyme treatment led to smaller weight loss and better fiber integrity. The esterase treatment technology is promising to produce higher-quality polyester textiles with an environmental friendly approach.

  5. A study of the antibacterial efficiency and coloration of dyed polyamide and polyester fabrics modified with colloidal Ag nanoparticles

    Directory of Open Access Journals (Sweden)

    VESNA ILIĆ

    2009-03-01

    Full Text Available In this study, the influence of dyeing on the antibacterial efficiency of polyamide and polyester fabrics loaded with colloidal Ag nanoparticles and the influence of the presence of Ag nanoparticles on the color change of dyed fabrics were investigated. Dyes C.I. acid green 25 and C.I. disperse blue 3 were used for dyeing of polyamide fabrics, while dye C.I. disperse violet 8 was used for dyeing of polyester fabrics. The influence of Ag nanoparticles on the color change of polyamide fabrics depends on the dye type, but generally it was lower compared to polyester fabrics. Polyester fabrics exhibited excellent antibacterial efficiency against Gram-positive bacterium Staphylococcus aureus and Gram-negative bacterium Escherichia coli, independent of the order of dyeing and Ag loading. Polyamide fabrics provided a desirable level of antibacterial activity only if the Ag loading was performed after dyeing.

  6. Polyester Fabric's Fluorescent Dyeing in Supercritical Carbon Dioxide and its Fluorescence Imaging.

    Science.gov (United States)

    Xiong, Xiaoqing; Xu, Yanyan; Zheng, Laijiu; Yan, Jun; Zhao, Hongjuan; Zhang, Juan; Sun, Yanfeng

    2017-03-01

    As one of the most important coumarin-like dyes, disperse fluorescent Yellow 82 exhibits exceptionally large two-photon effects. Here, it was firstly introduced into the supercritical CO2 dyeing polyester fabrics in this work. Results of the present work showed that the dyeing parameters such as the dyeing time, pressure and temperature had remarkable influences on the color strength of fabrics. The optimized dyeing condition in supercritical CO2 dyeing has been proposed that the dyeing time was 60 min; the pressure was 25 MPa and the temperature was 120 °C. As a result, acceptable products were obtained with the wash and rub fastness rating at 5 or 4-5. The polyester fabrics dyed with fluorescent dyes can be satisfied for the requirement of manufacturing warning clothing. Importantly, the confocal microscopy imaging technology was successfully introduced into textile fields to observe the distribution and fluorescence intensity of disperse fluorescent Yellow 82 on polyester fabrics. As far as we know, this is the first report about supercritical CO2 dyeing polyester fabrics based on disperse fluorescent dyes. It will be very helpful for the further design of new fluorescent functional dyes suitable for supercritical CO2 dyeing technique.

  7. Development and antibacterial performance of silver nanoparticles incorporated polydopamine–polyester-knitted fabric

    Indian Academy of Sciences (India)

    ZULFIQAR ALI RAZA; ASMA REHMAN; FAIZA ANWAR; ADIL USMAN

    2016-04-01

    Metallization is one of the finishing processes in textile treatment that can produce multifunctional effects. The present study dealt with the development of an antibacterial polyester-knitted fabric via facile and green impregnation of silver nanoparticles (SNPs). This was done by applying a polymeric foundation on the polyesterknitted fabric by simply dip-coating in the aqueous solution of dopamine. Then the SNPs were in situ fabricated and impregnated on the surface of polydopamine-modified polyester-knitted fabric in an aqueous solution of AgNO$_3$ at room temperature. Thus, a multi-functional finishing of polyester-knitted fabric was done. The Fourier transform infrared spectroscopy was done to confirm the polymer attachment. Scanning electron microscopy equipped withenergy dispersive X-ray was done to confirm the presence of SNPs on treated fabric. The crystallography of the treated surface was examined by X-ray diffraction. The antibacterial properties of treated fabrics against broadspectrum bacterial strains were investigated and found significant.

  8. Polyester fabric coated with Ag/ZnO composite film by magnetron sputtering

    Science.gov (United States)

    Yuan, Xiaohong; Xu, Wenzheng; Huang, Fenglin; Chen, Dongsheng; Wei, Qufu

    2016-12-01

    Ag/ZnO composite film was successfully deposited on polyester fabric by using direct current (DC) magnetron sputtering and radio frequency (RF) magnetron reaction sputtering techniques with pure silver (Ag) and zinc (Zn) targets. X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) were used to examine the deposited film on the fabric. It was found that the zinc film coated on Ag film before RF reactive sputtering could protect the silver film from oxidation. Anti-ultraviolet property and antistatic property of the coated samples using different magnetron sputtering methods were also investigated. The experimental results showed that Ag film was oxidized into in Ag2O film in high vacuum oxygen environment. The deposition of Zn film on the surface of the fabric coated with Ag film before RF reactive sputtering, could successfully obtained Ag/ZnO composite film, and also generated structural color on the polyester fabric.

  9. Study of the indoor decontamination using nanocoated woven polyester fabric

    Science.gov (United States)

    Memon, Hafeezullah; Kumari, Naveeta; Jatoi, Abdul Wahab; Khoso, Nazakat Ali

    2016-11-01

    This research primarily deals with the photocatalytic degradation of methanol in indoor air using nanocoated indoor textiles used for curtains as household textiles. The woven polyester was coated by titanium dioxide by sol gel method, using silicon-based binder. The characterization of the coating has been done using scanning electron microscopy (SEM) image analysis, energy dispersive analysis using X-ray (EDAX) and Fourier transform infrared spectroscopy (FTIR). The DIY instrument providing the similar environment as of indoor was designed to assess the performance of the degradation of formaldehyde under UV light. The photocatalytic degradation rate was measured using the absorption value of the solutions obtained in the result of liquid chromatography of test solution and reagent solution. Different amount of dosages (1-3 %) and different time period of coatings (half hour to 3 h) have been evaluated for optimization.

  10. Sulfonation of polyester fabrics by gaseous sulfur oxide activated by UV irradiation

    Energy Technology Data Exchange (ETDEWEB)

    Kordoghli, Bessem [Laboratory of Applied Chemical and Environment (UR-CAE) - University of Monastir (Tunisia); Textile Research Laboratory (LRT) - ISET Kasr Hellal, University of Monastir (Tunisia); Khiari, Ramzi, E-mail: khiari_ramzi2000@yahoo.fr [Laboratory of Applied Chemical and Environment (UR-CAE) - University of Monastir (Tunisia); LGP2 - Laboratory of Pulp and Paper Science, 461, Rue de la Papeterie - BP 65, 38402 Saint Martin d' Heres Cedex (France); Mhenni, Mohamed Farouk [Laboratory of Applied Chemical and Environment (UR-CAE) - University of Monastir (Tunisia); Sakli, Faouzi [Textile Research Laboratory (LRT) - ISET Kasr Hellal, University of Monastir (Tunisia); Belgacem, Mohamed Naceur [LGP2 - Laboratory of Pulp and Paper Science, 461, Rue de la Papeterie - BP 65, 38402 Saint Martin d' Heres Cedex (France)

    2012-10-01

    Highlights: Black-Right-Pointing-Pointer In this paper, an original technique was present to improve the hydrophilic properties of polyester fibres. Black-Right-Pointing-Pointer The modification of PET fabric was carried out using gaseous sulfur trioxide activated by UV irradiations. Black-Right-Pointing-Pointer We fully characterized the modified and untreated fabrics. - Abstract: This paper describes an original technique aiming to improve the hydrophilic properties of polyester fibres. In this method, the sulfonation of the aromatic rings is carried out using gaseous sulfur trioxide activated by UV irradiations. Thus, exposing the polyester textile fabric to the UVC light (wavelength around 254 nm) under a stream of sulfur trioxide leads to the fixation of -SO{sub 3}H groups. The amounts of the fixed sulfonate groups depended on the reaction conditions. Evidence of grafting deduced from the measurements of hygroscopic properties was carried out by contact angle measurement, moisture regain as well as by measuring the rate of retention. SEM and FT-IR analysis, DSC and DTA/TGA thermograms showed that no significant modifications have occurred in the bulk of the treated PET fabrics.

  11. Sulfonation of polyester fabrics by gaseous sulfur oxide activated by UV irradiation

    Science.gov (United States)

    Kordoghli, Bessem; Khiari, Ramzi; Mhenni, Mohamed Farouk; Sakli, Faouzi; Belgacem, Mohamed Naceur

    2012-10-01

    This paper describes an original technique aiming to improve the hydrophilic properties of polyester fibres. In this method, the sulfonation of the aromatic rings is carried out using gaseous sulfur trioxide activated by UV irradiations. Thus, exposing the polyester textile fabric to the UVC light (wavelength around 254 nm) under a stream of sulfur trioxide leads to the fixation of sbnd SO3H groups. The amounts of the fixed sulfonate groups depended on the reaction conditions. Evidence of grafting deduced from the measurements of hygroscopic properties was carried out by contact angle measurement, moisture regain as well as by measuring the rate of retention. SEM and FT-IR analysis, DSC and DTA/TGA thermograms showed that no significant modifications have occurred in the bulk of the treated PET fabrics.

  12. Study of compounds emitted during thermo-oxidative decomposition of polyester fabrics

    Directory of Open Access Journals (Sweden)

    Dzięcioł Małgorzata

    2016-03-01

    Full Text Available Compounds emitted during thermo-oxidative decomposition of three commercial polyester fabrics for indoor outfit and decorations (upholstery, curtains were studied. The experiments were carried out in a flow tubular furnace at 600°C in an air atmosphere. During decomposition process the complex mixtures of volatile and solid compounds were emitted. The main volatile products were carbon oxides, benzene, acetaldehyde, vinyl benzoate and acetophe-none. The emitted solid compounds consisted mainly of aromatic carboxylic acids and its derivatives, among which the greatest part took terephthalic acid, monovinyl terephthalate and benzoic acid. The small amounts of polycyclic aromatic hydrocarbons were also emitted. The emission profiles of the tested polyester fabrics were similar. The presence of toxic compounds indicates the possibility of serious hazard for people during fire.

  13. Water/oil repellent property of polyester fabrics after supercritical carbon dioxide finishing

    Directory of Open Access Journals (Sweden)

    Xu Yan-Yan

    2015-01-01

    Full Text Available The strong permeability and driving force of supercritical carbon dioxide renders it an ideal medium for fabrics finishing. This paper is to use supercritical carbon dioxide medium with a solution of organic fluorine to fabricate water/oil repellent polyester fabrics. A series of characterization methods including Fourier transform infrared spectrometry, energy dispersive spectrometry, and scanning electron microscopy were carried out to evaluate the fabrics finishing. Fourier transform infrared spectrometry showed that the transmittance peak appeared at 1202.4 and 1147.4 cm-1, indicating the presence of -CF2- group on the surface of polyester fabrics. The results of energy dispersive spectrometer and scanning electron microscopy showed that the fluorine was evenly distributed on the fibers surface. In addition, a series of physical properties were detected, including contact angel, air permeability, breaking strength, and wearing resistance. The average water and hexadecane contact angles were 147.58° and 143.78°, respectively. Compared with the initial fabrics, the treated one has little change in air permeability, while its strength increased greatly. The treated fabrics gained good water/oil repellent properties while keeping good air permeability and improving mechanical property.

  14. Optimizing the Dyeing Process of Alkali-Treated Polyester Fabric with Dolu Natural Dye

    Directory of Open Access Journals (Sweden)

    M.F. Shahin

    2014-06-01

    Full Text Available An attempt has been made to optimize the process of dyeing polyester (PET fabric with natural dyes. Polyester has been first treated with NaOH solution in order to study its impact on the dyeability to the natural dye. The required and used colour component was extracted from a natural plant, namely: Rhubarb; Rheum officinale. The chemical structure of the used colouring matter is observed to have all the characteristics of a typical disperse dye. The colour strength of PET fabric was noticed to increase as a result of alkali treatment which may be attributed to the alteration in the hydrophobicity of polyester fibre. The most effective parameters that may affect the dye uptake of the natural dye on alkali-treated PET fabric and the final dyeing properties including dye bath pH, dyeing temperature and time were studied in details. The behaviour of the selected and used natural dye was found to be similar to that of disperse dyes. Addition of salicylic acid to the dye bath accelerated the rate of dyeing and subsequently higher colour strength was attained. Non- ionic dispersing agent was also used to ensure better dyeing uniformity and higher dispersion stability of dye liquor.

  15. Cationization and gamma irradiation effects on the dyeability of polyester fabric towards disperse dyes

    Science.gov (United States)

    Zohdy, Maged H.

    2005-06-01

    The effect of hydrazine hydrate (HZH) treatment and/or gamma irradiation on the dyeing, mechanical and thermal properties of polyester fabrics (PET) was studied. The different factors that may affect the dyeing performance, such as concentrations of HZH, benzyl alcohol and pH values, were investigated. In this regard, the colour strength of untreated polyester fabrics dyed with the dyestuffs Dispersol blue BR, Dispersol orange B2R and Dispersol red B2B was found to be 10.34, 10.76 and 10.12 compared to 24.61, 24.90 and 23.00 in the case of irradiated and HZH-treated polyester fabrics, respectively. These colour strength values were achieved by preirradiation at a dose of 75 kGy followed by treatment with 15 ml l-1 of HZH. Thermogravimetric analysis (TGA) showed that the thermal decomposition stability was improved by using gamma irradiation and the treatment with HZH as indicated by the calculated activation energies. FT-IR spectroscopy showed that the treatment with HZH acts as cationizer prior to dyeing with disperse dyes.

  16. Physical Properties of Polyester Fabrics Treated with Nano, Micro and Macro Emulsion Silicones

    Science.gov (United States)

    Parvinzadeh, M.; Hajiraissi, R.

    2007-08-01

    The processing of textile to achieve a particular handle is one of the most important aspects of finishing technology. Fabrics softeners are liquid composition added to washing machines during the rinse cycle to make clothes feel better to the touch. The first fabric softeners were developed by the textile industry during the early twentieth century. In this research polyester fabrics were treated with nano, micro and macro emulsion silicone softeners. Some of the physical properties of the treated fabric samples are discussed. The drapeability of treated samples was improved after treatment with nano silicone softeners. The colorimetric measurement of softener-treated fabrics is evaluated with a reflectance spectrophotometer. Moisture regain of treated samples is increased due to coating of silicone softeners. There is some increase in the weight of softener-treated samples. Samples treated with nano emulsion silicones gave better results compared to micro- and macro-emulsion treated ones.

  17. Effect of Azo Dyes on the Thermal Degradation of Post-consumer Polyester Fabrics

    Directory of Open Access Journals (Sweden)

    Qin Dan

    2016-01-01

    Full Text Available Thermogravimetric analysis(TGA and pyrolysis gas chromatography mass spectrometry (Py-GC-MS investigations were carried out on the thermal degradation of white and red post-consumer polyester fabrics. The results show that red PET fabrics which was dyed with C.I. Disperse red 167 for its typical azo structure exhibits larger activation energy compared with white PET. The addition of azo dyes displays an inhibiting effect on the deep pyrolysis and the formation of biphenyl and bis(2-hydroxybutyl terephthalate produced by the free radical mechanism.

  18. Synthesis of PVDF ultrafiltration membranes supported on polyester fabrics for separation of organic matter from water

    Science.gov (United States)

    Mhlanga, Sabelo D.; Tshabalala, Tumelo G.; Nxumalo, Edward N.; Mamba, Bhekie B.

    2014-08-01

    Polyvinylidene flouride (PVDF) membranes supported on non-woven fabrics (NWF) of polyester are reported. The PVDF membranes were fabricated using the phase inversion method followed by modification of the active top layer of the PVDF thin film by adding polyvinylpyrolidone (PVP) into the cast solution. A PVDF resin was used with N- methyl-2-pyrrolidone (NMP) as a solvent. Sessile drop contact angle measurements and scanning electron microscopy (SEM) were used to study the physical properties of the membranes. Membrane rejection of humic acid was studied using a cross-flow membrane testing unit. The contact angle results revealed that the hydrophilicity of PVDF membranes increased as the PVP concentration was increased from 3 to 10 wt%. SEM analysis of the membranes revealed that the membrane pore sizes increased when PVP was added. AFM analysis also showed that membrane roughness changed when PVP was added. Total organic carbon (TOC) analysis of water samples spiked with humic acid was performed to test the rejection capacity of the membranes. Rejections of up to 97% were achieved for PVDF membranes supported on polyester NWF1, which had smaller thickness and higher permeability compared to polyester NWF2. The NWFs provided the high strength required for the membranes despite the modifications done on the PDVF surface and microstructure.

  19. ANTIMICROBIAL TEXTILE PREPARED BY SILVER DEPOSITION ON DIELECTRIC BARRIER DISCHARGE TREATED COTTON/POLYESTER FABRIC

    Directory of Open Access Journals (Sweden)

    Mirjana Kostić

    2008-11-01

    Full Text Available The objective of this research was to impart the additional value on cotton//polyester (Co/PES fabrics (i.e. antimicrobial properties to improve the quality of life and thus to tap new markets with the product. In this paper, silver ions were incorporated in Co/PES fabrics by chemisorptions into the fabric previously treated in a dielectric barrier discharge (DBD. A series of the DBD fabric treatments were done in order to determine the most suitable experimental conditions for the DBD activation of the fabric surface, while the optimal conditions for silver ions sorption by Co/PES fabrics were determined by changing sorption conditions. The antimicrobial Co/PES fabrics prepared by dielectric barrier discharge mediated silver deposition show an antimicrobial activity against tested pathogens: S. aureus, E. coli, and C. albicans under in vitro conditions. The obtained results confirm the practicability of the plasma modification process and furthermore show that with some delays in the next step, i.e. silver ion sorption, we can get the increase in the amount of the sorbed silver ions; the maximum sorption capacity of modified Co/PES fabrics was 0.135 mmol of Ag+ ions per gram of a fabric.

  20. Dyeing of Polyester and Polyamide Synthetic Fabrics with Natural Dyes Using Ecofriendly Technique

    Directory of Open Access Journals (Sweden)

    Khaled Elnagar

    2014-01-01

    Full Text Available This work presents an ecofriendly method for dyeing synthetic fabrics with natural dyes using UV/ozone pretreatment to activate fiber and improve dyeability of polyester and nylon. Fabrics are pretreated with UV/ozone for different periods of time ranged from 5 min to 120 min. Effect of pretreatment on surface morphology was studied by scanning electron microscope (SEM. Mechanical behavior was studied by testing tensile strength and elongation percentage. Chemical modification of the surface was studied using attenuated total reflection Fourier transform infrared spectrometer (ATR-FTIR. Dyeability of the treated samples was investigated in terms of their colour strength expressed as K/s in addition to fastness to washing and light. This research showed the increment of the affinity of the studied synthetic fabrics towards curcumin and saffron natural dyes using ecofriendly technique.

  1. Dyeing of Polyester Woven Fabric with Disperse Dye Using Conventional and Microwave Technique

    Directory of Open Access Journals (Sweden)

    Uzma Syed

    2014-07-01

    Full Text Available Polyester fabric is generally dyed using high temperature dyeing technique and carrier. Both techniques require high energy consumption while few carriers are toxic in nature. In this study, 100% polyester woven fabric was dyed by microwave and conventional dyeing technique with disperse dye; Foron Blue RD GLN by an exhaust method for short dyeing cycle (15 and 30 min. The fabric samples were dyed using conventional high temperature dyeing technique using recommended recipe. Moreover, samples were also dyed using microwave technique with recommended recipe and by the addition of salt and urea, pre-treatment with caustic and organic solvent for improving the dye uptake value and fastness properties. The dyeing assessment; (K/S?max value by Datacolor spectrophotometer, dye uniformity by optical microscope and washing fastness by grey scale were measured. It has been observed that over conventional dyeing method, microwave irradiation dyed sample gives almost 70% high (K/S?max value and uniform dye penetration and good to very good washing fastness property. In addition, microwave dyeing gives excellent dyeing behavior at short dyeing cycle; 15 min; hence saves energy and sustainable dyeing process

  2. Synthesis of Malononitrile-Condensed Disperse Dyes and Application on Polyester and Nylon Fabrics

    Directory of Open Access Journals (Sweden)

    Yusuf Y. Lams

    2014-01-01

    Full Text Available An active methylene compound, malononitrile, was introduced into the structures of a series of disperse dyes previously prepared by coupling phloroglucinol, barbituric acid, and α and β-naphtho to 4-amino-3-nitrobenzaldehyde. The dyes were purified by recrystallization from ethanol. The purity of the dyes was examined by thin-layer chromatography (TLC and the dyes were characterized by visible absorption and Fourier transform infrared spectroscopy (FTIR. The malononitrile-condensed dyes produced deeper colours and shades with better fastness to wash, light, and perspiration on application to polyester and nylon fabrics when compared to their uncondensed analogue.

  3. Polyester fabric sheet layers functionalized with graphene oxide for sensitive isolation of circulating tumor cells.

    Science.gov (United States)

    Bu, Jiyoon; Kim, Young Jun; Kang, Yoon-Tae; Lee, Tae Hee; Kim, Jeongsuk; Cho, Young-Ho; Han, Sae-Won

    2017-05-01

    The metastasis of cancer is strongly associated with the spread of circulating tumor cells (CTCs). Based on the microfluidic devices, which offer rapid recovery of CTCs, a number of studies have demonstrated the potential of CTCs as a diagnostic tool. However, not only the insufficient specificity and sensitivity derived from the rarity and heterogeneity of CTCs, but also the high-cost fabrication processes limit the use of CTC-based medical devices in commercial. Here, we present a low-cost fabric sheet layers for CTC isolation, which are composed of polyester monofilament yarns. Fabric sheet layers are easily functionalized with graphene oxide (GO), which is beneficial for improving both sensitivity and specificity. The GO modification to the low-cost fabrics enhances the binding of anti-EpCAM antibodies, resulting in 10-25% increase of capture efficiency compared to the surface without GO (anti-EpCAM antibodies directly onto the fabric sheets), while achieving high purity by isolating only 50-300 leukocytes in 1 mL of human blood. We investigated CTCs in ten human blood samples and successfully isolated 4-42 CTCs/mL from cancer patients, while none of cancerous cells were found among healthy donors. This remarkable results show the feasibility of GO-functionalized fabric sheet layers to be used in various CTC-based clinical applications, with high sensitivity and selectivity. Copyright © 2017 Elsevier Ltd. All rights reserved.

  4. Preparation and properties of copper/polyaniline/polyester composite electromagnetic shielding fabric

    Directory of Open Access Journals (Sweden)

    Jing YU

    2016-04-01

    Full Text Available Conductive polyaniline and polyester composite fabric(PANI/PET is prepared by in-situ polymerization, and after it is activated by hyperbranched polyamidomine/Ag+, Cu is uniformly deposited on its surface by electroless copper plating, finally Cu/PANI/PET composite fabric is obtained. Scanning electron microscope, X-ray diffraction and electromagnetic shielding effectiveness are used to analyze the samples. The results show that using PANI as the middle layer can reduce the average grain size apparently and improve the thermal stability and the friction resistance, and the electromagnetic shielding effectiveness of Cu/PANI/PET can reach 130 dB in the frequency range of 300 kHz~3 GHz.

  5. Thermal Comfort Properties of Clothing Fabrics Woven with Polyester/Cotton Blend Yarns

    Directory of Open Access Journals (Sweden)

    Özdemir Hakan

    2017-06-01

    Full Text Available In this research, thermal and water vapor resistance, components of thermal comfort of 65/35 and 33/67% polyester/ cotton (PES/CO blend fabrics woven with 2/2 twill, matt twill, cellular and diced weaves, which are commonly used for clothing, were determined. The results indicate that both the fabric construction and the constituent fiber properties affect thermal comfort properties of clothing woven fabrics. Cellular weave, which is derivative of sateen weave and diced weave, which is compound weave, has the highest thermal resistance appropriating for cold climatic conditions. On the other hand, the 2/2 twill weave and matt twill weave, which is derivative of sateen weave, depicted the lowest water vapor thermal resistance, making it convenient for hot climatic conditions. Besides, fabrics woven with 65/35% PES/CO blend yarns have higher thermal resistance, so they are suitable for cold climatic conditions. Fabrics woven with 33/67% PES/CO blend yarns have lower water vapor resistance, so they are convenient for hot climatic conditions.

  6. Water-based chitosan/melamine polyphosphate multilayer nanocoating that extinguishes fire on polyester-cotton fabric.

    Science.gov (United States)

    Leistner, Marcus; Abu-Odeh, Anas A; Rohmer, Sarah C; Grunlan, Jaime C

    2015-10-05

    Polyester-cotton (PECO) blends are widely used in the textile industry because they combine the softness of cotton and the strength and durability of polyester. Unfortunately, both fiber types share the disadvantage of being flammable. The layer-by-layer coating technique was used to deposit a highly effective flame retardant (melamine polyphosphate) from water onto polyester-cotton fabric. Soluble melamine and sodium hexametaphosphate form this water-insoluble flame retardant during the coating procedure. This unique nanocoating imparts self-extinguishing properties to PECO with only 12% relative coating weight. Vertical flame testing, pyrolysis combustion flow calorimetry (PCFC), thermogravimetric analysis (TGA), and scanning electron microscopy were used to evaluate the quality of the coating as well as its flame retardant performance. A combination of both condensed and gas-phase activity appears to be the reason for this effective flame retardancy. Degradation pathways of both cotton and polyester are affected by the applied coating, as shown by PCFC and TGA. Use of environmentally benign and non-toxic chemicals, and the ease of layer-by-layer deposition, making this coating an industrially feasible alternative to render polyester-cotton fabric self-extinguishing.

  7. Topographical effects of 02- and NH3-plasma treatment on woven plain polyester fabric in adjusting hydrophilicity

    NARCIS (Netherlands)

    Calvimontes, Alfredo; Saha, Rajib; Dutschk, Victoria

    2011-01-01

    Hydrophilisation of polyester textile materials has been investigated over the last twenty years using low-pressure and atmospheric plasmas. According to these studies, wettability and capillarity of fabrics can be significantly improved depending on the process gas used. In the present study, the e

  8. Fabrication of narrow surface relief features in a side-chain azobenzene polyester with a scanning near-field microscope

    DEFF Research Database (Denmark)

    Ramanujam, P.S.; Holme, N. C. R.; Pedersen, M.

    2001-01-01

    We show that it is possible to fabricate topographic submicron features in a side-chain azobenzene polyester with a scanning near-field optical microscope, Through irradiation at a wavelength of 488 run at intensity levels of 12 W/cm(2), topographic features as narrow as 240 nm and as high as 6 n...

  9. Multiwalled carbon nanotube coated polyester fabric as textile based flexible counter electrode for dye sensitized solar cell.

    Science.gov (United States)

    Arbab, Alvira Ayoub; Sun, Kyung Chul; Sahito, Iftikhar Ali; Qadir, Muhammad Bilal; Jeong, Sung Hoon

    2015-05-21

    Textile wearable electronics offers the combined advantages of both electronics and textile characteristics. The essential properties of these flexible electronics such as lightweight, stretchable, and wearable power sources are in strong demand. Here, we have developed a facile route to fabricate multi walled carbon nanotube (MWCNT) coated polyester fabric as a flexible counter electrode (CE) for dye sensitized solar cells (DSSCs). A variety of MWCNT and enzymes with different structures were used to generate individual enzyme-dispersed MWCNT (E-MWCNT) suspensions by non-covalent functionalization. A highly concentrated colloidal suspension of E-MWCNT was deposited on polyester fabric via a simple tape casting method using an air drying technique. In view of the E-MWCNT coating, the surface structure is represented by topologically randomly assembled tubular graphene units. This surface morphology has a high density of colloidal edge states and oxygen-containing surface groups which execute multiple catalytic sites for iodide reduction. A highly conductive E-MWCNT coated fabric electrode with a surface resistance of 15 Ω sq(-1) demonstrated 5.69% power conversion efficiency (PCE) when used as a flexible CE for DSSCs. High photo voltaic performance of our suggested system of E-MWCNT fabric-based DSSCs is associated with high sheet conductivity, low charge transfer resistance (RCT), and excellent electro catalytic activity (ECA). Such a conductive fabric demonstrated stable conductivity against bending cycles and strong mechanical adhesion of E-MWCNT on polyester fabric. Moreover, the polyester fabric is hydrophobic and, therefore, has good sealing capacity and retains the polymer gel electrolyte without seepage. This facile E-MWCNT fabric CE configuration provides a concrete fundamental background towards the development of textile-integrated solar cells.

  10. Surface modification of polyester fabric with plasma pretreatment and carbon nanotube coating for antistatic property improvement

    Energy Technology Data Exchange (ETDEWEB)

    Wang, C.X., E-mail: cxwang@mail.dhu.edu.cn [College of Textiles and Clothing, Yancheng Institute of Technology, Jiangsu 224051 (China); Collaborative Innovation Center for Ecological Building Materials and Environmental Protection Equipments, Jiangsu 224051 (China); Key Laboratory for Advanced Technology in Environmental Protection, Jiangsu 224051 (China); Lv, J.C. [College of Textiles and Clothing, Yancheng Institute of Technology, Jiangsu 224051 (China); Ren, Y. [School of Textile and Clothing, Nantong University, Jiangsu 226019 (China); Zhi, T.; Chen, J.Y.; Zhou, Q.Q. [College of Textiles and Clothing, Yancheng Institute of Technology, Jiangsu 224051 (China); Lu, Z.Q.; Gao, D.W. [College of Textiles and Clothing, Yancheng Institute of Technology, Jiangsu 224051 (China); Collaborative Innovation Center for Ecological Building Materials and Environmental Protection Equipments, Jiangsu 224051 (China); Key Laboratory for Advanced Technology in Environmental Protection, Jiangsu 224051 (China); Jin, L.M. [Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204 (China)

    2015-12-30

    Graphical abstract: - Highlights: • PET was finished by plasma treatment and SWCNT coating to improve antistatic property. • Plasma modification had a positive effect on SWCNT coating on PET fiber surface. • O{sub 2} plasma was more effective in SWCNT coating than Ar plasma in the shorter time. • Antistatic enhanced and then declined with enhancing treatment time and output power. • Antistatic increased with increasing concentration, curing time, curing temperature. - Abstract: This study introduced a green method to prepare antistatic polyester (PET) fabrics by plasma pretreatment and single-walled carbon nanotube (SWCNT) coating. The influences of plasma conditions and SWCNT coating parameters on antistatic property of PET fabrics were investigated. PET fabrics were pretreated under various plasma conditions such as different treatment times, output powers and working gases, and then SWCNT coating on the plasma treated PET fabrics was carried out by coating-dry-cure using various coating parameters including different SWCNT concentrations, curing times and curing temperatures. PET fabrics were characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and volume resistivity. SEM and XPS analysis of the plasma treated PET fabrics revealed the increase in surface roughness and oxygen/nitrogen containing groups on the PET fiber surface. SEM and XPS analysis of the plasma treated and SWCNT coated PET fabrics indicated the SWCNT coating on PET fiber surface. The plasma treated and SWCNT coated PET fabrics exhibited a good antistatic property, which increased and then decreased with the increasing plasma treatment time and output power. The antistatic property of the O{sub 2} plasma treated and SWCNT coated PET fabric was better and worse than that of N{sub 2} or Ar plasma treated and SWCNT coated PET fabric in the shorter treatment time and the longer treatment time, respectively. In addition, the antistatic property of the

  11. Mechanical properties of waste paper/jute fabric reinforced polyester resin matrix hybrid composites.

    Science.gov (United States)

    Das, Sekhar

    2017-09-15

    Hybrid composites were prepared with jute fabric and un-shredded newspaper in polyester resin matrix. The experiment was designed 1:2 weights ratio jute and unshredded newspaper to have 42 (w/w)% fibre content hybrid composites and two different sequences jute/paper/jute and paper/jute/paper of waste newspaper and jute fabric arrangement. Reinforcing material is characterized by chemically, X-ray diffraction methods, Fourier transform infrared spectroscopy and tensile testing. The tensile, flexural and interlaminar shear strength and fracture surface morphology of composites were evaluated and compared. It was found that tensile and flexural properties of the hybrid composite are higher than that of pure paper-based composite but less than pure woven jute composite. The hybridization effect of woven jute fabric and layering pattern effect on mechanical properties of newspaper/woven jute fabric hybrid composites were studied. The test results of composites were analyzed by one-way ANOVA (α=0.05), it showed significant differences among the groups. Copyright © 2017 Elsevier Ltd. All rights reserved.

  12. Synthesis and dyeing properties of new disazo disperse dyes for polyester and nylon fabrics

    Directory of Open Access Journals (Sweden)

    Tarulata B. Shah

    2014-12-01

    Full Text Available Diazotized aryl amines were coupled with two stenhouse salt namely, N-(5-phenylamino-penta-4-ol-2,4-diene-1-ylideneanilines hydrochloride [S1 (RH or S2 (ROH] to furnish two series of disazo disperse dyes (S1D1–10 and S2D1–10. The structure of all the dyes was established by estimating number of azo groups, elemental analysis and spectral studies (IR, 1H-NMR, UV/Visible. The structure–property relationship was discussed by using electronic absorption spectra of the dyes. These dyes were applied to polyester and nylon fabrics as disperse dyes by using temperature exhaust dyeing method. The relevant dyeing characteristics, such as dyeability on fabrics, wash-fastness and light-fastness were evaluated. Fabrics dyed with these dyes furnished generally deep and bright intense hues ranging from light yellow to orange to reddish brown. The color fastness of the dyed fabric was assessed by determining wash-fastness and light-fastness properties.

  13. The influence of pH adjusted with different acids on the dyeability of polyester fabric

    Directory of Open Access Journals (Sweden)

    Miljkovic Milena N.

    2014-12-01

    Full Text Available The influence of using formic, oxalic, citric, tartaric, hydrochloric, nitric, sulphuric and phosphoric acid for dyebath pH adjustment was investigated upon the dyeing of polyester fabric with CI Disperse Yellow 60. The positions of colour in CIELab coordinates of the samples dyed with the addition of tested acids were assessed and compared to those dyed with the addition of acetic acid. It was found that the differences in dyeabilities obtained with the addition of citric, oxalic, hydrochloric, nitric and sulphuric acid are entirely acceptable according to both M&S 83A and CMC (2:1 standards in comparison to the dyeability obtained with the addition of acetic acid.

  14. Study of oxygen plasma pre-treatment of polyester fabric for improved polypyrrole adhesion

    Energy Technology Data Exchange (ETDEWEB)

    Mehmood, Tariq [School of Engineering, Deakin University, Geelong, Victoria 3216 (Australia); Kaynak, Akif, E-mail: akaynak@deakin.edu.au [School of Engineering, Deakin University, Geelong, Victoria 3216 (Australia); Dai, Xiujuan J. [Institute for Frontier Materials, Deakin University, Geelong, Victoria 3216 (Australia); Kouzani, Abbas [School of Engineering, Deakin University, Geelong, Victoria 3216 (Australia); Magniez, Kevin; Rubin de Celis, David; Hurren, Christopher J. [Institute for Frontier Materials, Deakin University, Geelong, Victoria 3216 (Australia); Plessis, Johan du [School of Applied Sciences, RMIT University, GPO Box 2476V, Melbourne, Victoria 3001 (Australia)

    2014-01-15

    In this work, we have systematically studied the improvement of binding of polypyrrole with polyethylene terephthalate (PET) thin films and fabrics using low pressure oxygen plasma. A range of plasma treatment times were employed to investigate plasma induced effects on surface roughness, surface chemistry and hydrophilicity. Modifications of PET films were studied with respect to surface morphology by means of atomic force and scanning electron microscopy. Chemical effects of plasma treatment were studied using X-ray photoelectron spectroscopy. Results showed that both the increase in surface functionalisation by carboxylic groups and formation of nano size roughness contributed to improved adhesion and conductivity. - Highlights: • Improved adhesion between polypyrrole and polyester due to oxygen plasma treatment. • Formation of additional C–O and O–C=O groups due to plasma reactions. • Plasma induced increase in surface energy and roughness.

  15. Different plasma-based strategies to improve the interaction of anionic dyes with polyester fabrics surface

    Science.gov (United States)

    Salem, Tarek; Pleul, Dieter; Nitschke, Mirko; Müller, Martin; Simon, Frank

    2013-01-01

    Low-pressure plasma treatments with subsequent immobilization of functional macromolecules from aqueous solution have gained an increasing popularity for its applications in new industrial processes. In this work, two different strategies to endow polyester fabrics (PET) with accessible primary amino groups are compared. (a) NH2 groups were produced directly using low-pressure ammonia plasma. (b) Negatively charged groups were introduced by low-pressure oxygen plasma to hydrophilize the fabric surfaces and used as anchor groups for the immobilization of water-borne polyelectrolyte copolymers poly(vinyl amine-co-vinyl amide) (PVAm). To study the effects of these surface modifications, a combination of various surface-sensitive characterization techniques such as X-ray photoelectron spectroscopy (XPS), streaming potential measurements and time-dependent contact angle measurements were used. Furthermore, the influence of the pre-treatments on the interaction of PET fabrics with water-soluble dyes was evaluated. For that purpose, color strength and fastness tests were carried out to prove the effectiveness of pre-treatments.

  16. Synthesis of polyester urethane urea and fabrication of elastomeric nanofibrous scaffolds for myocardial regeneration

    Energy Technology Data Exchange (ETDEWEB)

    Jamadi, Elham Sadat; Ghasemi-Mobarakeh, Laleh [Department of Textile engineering, Isfahan university of technology, Isfahan 84156-83111 (Iran, Islamic Republic of); Morshed, Mohammad, E-mail: morshed@cc.iut.ac.ir [Department of Textile engineering, Isfahan university of technology, Isfahan 84156-83111 (Iran, Islamic Republic of); Sadeghi, Morteza [Department of Chemical Engineering, Isfahan university of technology, Isfahan 84156-83111 (Iran, Islamic Republic of); Prabhakaran, Molamma P., E-mail: nanotechmpp@gmail.com [Department of Mechanical Engineering, Faculty of Engineering, 2 Engineering Drive 3, National University of Singapore, Singapore 117576 (Singapore); Ramakrishna, Seeram [Department of Mechanical Engineering, Faculty of Engineering, 2 Engineering Drive 3, National University of Singapore, Singapore 117576 (Singapore)

    2016-06-01

    Fabrication of bioactive scaffolds is one of the most promising strategies to reconstruct the infarcted myocardium. In this study, we synthesized polyester urethane urea (PEUU), further blended it with gelatin and fabricated PEUU/G nanofibrous scaffolds. Attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), differential scanning calorimetry (DSC) and X-ray diffraction were used for the characterization of the synthesized PEUU and properties of nanofibrous scaffolds were evaluated using scanning electron microscopy (SEM), ATR-FTIR, contact angle measurement, biodegradation test, tensile strength analysis and dynamic mechanical analysis (DMA). In vitro biocompatibility studies were performed using cardiomyocytes. DMA analysis showed that the scaffolds could be reshaped with cyclic deformations and might remain stable in the frequencies of the physiological activity of the heart. On the whole, our study suggests that aligned PEUU/G 70:30 nanofibrous scaffolds meet the required specifications for cardiac tissue engineering and could be used as a promising construct for myocardial regeneration. - Highlights: • PEUU was synthesized to fabricate elastomeric scaffolds for myocardial regeneration. • FTIR, DSC and XRD analysis showed that polymer synthesis was well. • PEUU/gelatin nanofibrous scaffolds could be reshaped with cyclic deformations of the heart. • Gelatin in structure of PEUU nanofibers improved proliferation of cardiomyocytes. • Aligned PEUU/gelatin 70:30 nanofibrous scaffold support the alignment of cardiomyocytes.

  17. Fabrication and characterization of biomimetic multichanneled crosslinked-urethane-doped polyester tissue engineered nerve guides.

    Science.gov (United States)

    Tran, Richard T; Choy, Wai Man; Cao, Hung; Qattan, Ibrahim; Chiao, Jung-Chih; Ip, Wing Yuk; Yeung, Kelvin Wai Kwok; Yang, Jian

    2014-08-01

    Biomimetic scaffolds that replicate the native architecture and mechanical properties of target tissues have been recently shown to be a very promising strategy to guide cellular growth and facilitate tissue regeneration. In this study, porous, soft, and elastic crosslinked urethane-doped polyester (CUPE) tissue engineered nerve guides were fabricated with multiple longitudinally oriented channels and an external non-porous sheath to mimic the native endoneurial microtubular and epineurium structure, respectively. The fabrication technique described herein is highly adaptable and allows for fine control over the resulting nerve guide architecture in terms of channel number, channel diameter, porosity, and mechanical properties. Biomimetic multichanneled CUPE guides were fabricated with various channel numbers and displayed an ultimate peak stress of 1.38 ± 0.22 MPa with a corresponding elongation at break of 122.76 ± 42.17%, which were comparable to that of native nerve tissue. The CUPE nerve guides were also evaluated in vivo for the repair of a 1 cm rat sciatic nerve defect. Although histological evaluations revealed collapse of the inner structure from CUPE TENGs, the CUPE nerve guides displayed fiber populations and densities comparable with nerve autograft controls after 8 weeks of implantation. These studies are the first report of a CUPE-based biomimetic multichanneled nerve guide and warrant future studies towards optimization of the channel geometry for use in neural tissue engineering.

  18. Transport behavior of n-alkane penetrants into castor oil based polyurethane-polyester nonwoven fabric composites

    Energy Technology Data Exchange (ETDEWEB)

    Satheesh Kumar, M.N. [Research and Innovation Center, Raman Boards Limited, Mysore 570012 (India); Manjula, K.S. [Department of Polymer Science and Technology, Sri Jayachamarajendra College of Engineering, Mysore 570006 (India); Siddaramaiah [Department of Polymer Science and Technology, Sri Jayachamarajendra College of Engineering, Mysore 570006 (India)]. E-mail: siddaramaiah@yahoo.com

    2007-06-25

    Castor oil based polyurethane (PU)-polyester nonwoven fabric composites were fabricated by impregnating the polyester nonwoven fabric in a composition containing castor oil and diisocyanate. Composites were fabricated with two different isocyanates such as toluene-2,4-diisocyanate (TDI) and hexamethylene diisocyanate (HMDI). Transport behavior of n-alkane penetrants (pentane, hexane and heptane) into both PUs and PU-polyester nonwoven fabric composites were studied. Sorption studies were carried out at different temperatures. From the sorption results, the diffusion (D) and permeation (P) coefficients of penetrants have been calculated. Significant increase in the diffusion and permeation coefficients was observed with increase in the temperature of sorption experiments. Drastical reduction in diffusion and permeation coefficients was noticed in the composites compared to neat PUs. Attempts were made to estimate the empirical parameters like n, which suggests the mode of transport and K is a constant depends on the structural characteristics of the composite in addition to its interaction with penetrants. The temperature dependence of the transport coefficients has been used to estimate the activation energy parameter for diffusion (E{sub D}) and permeation (E{sub P}) processes from Arrhenius plots. Furthermore, the sorption results have been interpreted in terms of the thermodynamic parameters such as enthalpy ({delta}H) and entropy ({delta}S)

  19. TiO2/Polyester Non-woven Fabrics as a Kind of Photocatalyst for the Degradation of Formaldehyde Gas

    Institute of Scientific and Technical Information of China (English)

    2005-01-01

    The feasibility of photocatalytic degradation of the formaldehyde gas by titanium dioxide (TiO2)/polyester non-woven fabrics was studied. The effects of parameters such as the concentration of TiO2 solution, pH value, and drying temperature on the photocatalytie degradation of the formaldehyde gas were also studied. The results showed that the photodegradation efficiency of the formaldehyde gas increased rapidly with the increasing of the concentration of TiO2 solution up to 15g/L, but when the concentration was in excess of 15 g/L, the photodegradation efficiency decreased gradually and fluctuated due to light obstruction and disperse state of TiO2. Adjusting the pH value in the solution, the efficiency of photocatalytic degradation of the formaldehyde gas could be improved. The mechanisms of the reaction and the role of the additives were also investigated. After 42hours, TiO2/ polyester non-woven fabric showed no significant loss of the photocatalytic activity. Ke ywords : formaldehyde, photocatal ytic degradation,titanium dioxide, polyester non-voven fabric.

  20. Surface modification of polyester fabrics by atmospheric-pressure air/He plasma for color strength and adhesion enhancement

    Science.gov (United States)

    Zhang, Chunming; Zhao, Meihua; Wang, Libing; Qu, Lijun; Men, Yajing

    2017-04-01

    Surface properties of water-based pigmented inks for ink-jet printed polyester fabrics were modified with atmospheric-pressure air/He plasma to improve the color strength and pigment adhesion of the treated surfaces. The influence of various parameters, including the surface morphology, chemical compositions, surface energy and dynamic contact angles of the control and plasma treated samples was studied. Color strength and edge definition were used to evaluate the ink-jet printing performance of fabrics. The change in pigment adhesion to polyester fibers was analyzed by SEM (scanning electron microscopy). AFM (Atomic force microscope) and XPS (X-ray photoelectron spectroscopy) analyses indicated the increase in surface roughness and the oxygen-containing polar groups(Cdbnd O, Csbnd OH and COOH) reinforced the fixation of pigments on the fiber surface. The result from this study suggested that the improved pigment color yield was clearly affected by alteration of pigment adhesion enhanced by plasma surface modification. Polyester fabrics exhibited better surface property and ink-jet printing performance after the air/He mixture plasma treatment comparing with those after air plasma treatment.

  1. Fabrication, characterization, and dynamic behavior of polyester/TiO{sub 2} nanocomposites

    Energy Technology Data Exchange (ETDEWEB)

    Evora, Victor M.F.; Shukla, Arun

    2003-11-25

    Unsaturated polyester resin specimens embedded with small loadings of 36 nm average diameter TiO{sub 2} particles were fabricated using a direct ultrasonification method to study the effects of nanosized particles on nanocomposite bulk mechanical properties. The ultrasonification method employed produced nanocomposites with excellent particle dispersion as verified by transmission electron microscopy (TEM). Quasi-static fracture toughness, tension, and compression testing was carried out. The presence of the particles had the greatest effect on fracture toughness; negligible influence was observed in the remaining quasi-static properties. Scanning electron microscopy (SEM) of fracture surfaces was carried out to identify toughening mechanisms. The inadequacy of the bond between the filler and the matrix and the presence of minor particle agglomerations in specimens containing higher volume fractions of particles were believed to be responsible for a consistent decrease in property values beyond a volume fraction of 1 vol.%. Dynamic fracture toughness testing was carried out, and an increase in dynamic fracture toughness relative to quasi-static fracture toughness was observed. High strain rate testing conducted using a split Hopkinson pressure bar (SHPB) apparatus revealed a moderate stiffening effect with increasing particle volume fraction, although no marked effect was observed on the ultimate strength.

  2. Rapid Fabrication of Electrophoretic Microfluidic Devices from Polyester, Adhesives and Gold Leaf

    Directory of Open Access Journals (Sweden)

    Christopher Birch

    2017-01-01

    Full Text Available In the last decade, the microfluidic community has witnessed an evolution in fabrication methodologies that deviate from using conventional glass and polymer-based materials. A leading example within this group is the print, cut and laminate (PCL approach, which entails the laser cutting of microfluidic architecture into ink toner-laden polyester sheets, followed by the lamination of these layers for device assembly. Recent success when applying this method to human genetic fingerprinting has highlighted that it is now ripe for the refinements necessary to render it amenable to mass-manufacture. In this communication, we detail those modifications by identifying and implementing a suitable heat-sensitive adhesive (HSA material to equip the devices with the durability and resilience required for commercialization and fieldwork. Importantly, this augmentation is achieved without sacrificing any of the characteristics which make the PCL approach attractive for prototyping. Exemplary HSA-devices performed DNA extraction, amplification and separation which, when combined, constitute the complete sequence necessary for human profiling and other DNA-based analyses.

  3. Improvement of 3D Polyester Fabric Surface with Nano Beta-Cyclodextrin and Hydrophilic Silicone and Microemulsion Softeners

    Directory of Open Access Journals (Sweden)

    M. M. Jolaei

    2016-12-01

    Full Text Available Modifying of polyester spacer fabric by β-Cyclodextrin may create new characteristics in the product. Using different siloxane including amino ethyl amino propyl polydimethylsiloxane and polyether amino functional siloxane can produce appropriate softness and lead to relative stability of β-CD on polyester fabric. In this research different concentration of siloxane compounds as a softener, and β- CD as a modifier are applied and some of the properties of the fabric including weight change, regain, water drop absorption time on fabric surface, chrome ion absorption and reactive dye absorption are studied. Also morphology of fabric surface has been examined by SEM images and chemical structure by FT-IR. We have also studied washing durability of the modified product after 10 times of washing. The results show that increasing of concentration of softener and β-CD leads to obtain a higher gain modification. In comparison of two different based softeners the amino ethyl amino propyl polydimethylsiloxane (AEAP- Silicon indicates a better durability than the polyether amino functional siloxane (PEA-Silicon.

  4. Evaluation of the flammability and thermal properties of a new flame retardant coating applied on polyester fabric

    Directory of Open Access Journals (Sweden)

    A.A. Younis

    2016-06-01

    Full Text Available The objective of this research was to investigate the effect of non-durable flame retardant (NDFR coating of samples of polyester fabric untreated and treated with UV/Ozone for different periods. For this purpose, these samples were tested by Fourier transform infrared (FTIR spectroscopy, thermal analysis tests as thermo-gravimetric analysis (TGA and differential scanning calorimeter (DSC. The ignition test was applied using limiting oxygen index (LOI, flame chamber (UL/94. Results indicated that both AZ2 (dried at room temperature and AZ8–12 (dried at 80 °C for 30 min after coating with non-durable fire retardant (NDFR coating polyester samples have significantly decreased the rate of burning and increased the limiting oxygen index.

  5. Surface physical-morphological and chemical changes leading to performance enhancement of atmospheric pressure plasma treated polyester fabrics for inkjet printing

    Science.gov (United States)

    Fang, Kuanjun; Zhang, Chunming

    2009-06-01

    Without any preprocessing, polyester fabric has lower ability to hold on water due to the smooth morphology and chemistry property of polyester fibers. Therefore, patterns directly printed with pigment inks have poor color yields and easily bleed. In this paper, atmospheric pressure plasma was used to pretreat polyester fabric in order to provide an active surface for the inkjet printing. The results showed that surface-modified polyester fabrics could obtain the effects of features with enhanced color yields and excellent pattern sharpness. SEM images indicated that the rough surface of plasma treated fibers could provide more capacities for the fabric to capture inks and also facilitate the penetration of colorant particles into the polyester fabric. XPS analysis revealed that air + 50%Ar plasma introduced more oxygen-containing groups onto the fabric surface than air plasma. Although AFM images indicated that etching effects generated by air plasma treatments were more evident, the air/Ar plasma treated sample has higher K/ S value and better color performance. These studies have also shown that the chemical modification of plasma appears to be relatively more significant for improving the effect of inkjet printing.

  6. A New Approach to Dyeing of 80 : 20 Polyester/Cotton Blended Fabric Using Disperse and Reactive Dyes

    OpenAIRE

    2011-01-01

    Polyester/Cotton blended fabrics are normally dyed by two-bath or one-bath two-step dyeing method. This paper deals with a new approach involving azeotropic ternary mixture of organic solvents pretreatment to dye polyester/cotton blends using disperse and reactive dyes in one-bath method. The effect of solvent pretreatments on dyeability, fastness, and few physicochemical properties has been investigated involving SEM, FTIR, DSC, and XRD studies, and results are presented.

  7. COMPARATIVE STUDY OF EXHAUSTION AND PAD-STEAM METHODS FOR IMPROVEMENT OF HANDLE, DYE UPTAKE AND WATER ABSORPTION OF POLYESTER/COTTON FABRIC

    Directory of Open Access Journals (Sweden)

    Aminoddin Haji

    2011-09-01

    Full Text Available In this study, a pad-steam process for treatment of polyester/cotton fabric with sodium hydroxide is developed and the effects of process parameters on selected properties of the fabric are investigated. The results are compared with the conventional exhaustion process. Both processes improved the handle, dyeability and water absorption of the polyester/cotton fabric, but the pad-steam process has the advantages of less strength loss of the fibers, shorter treatment time, lower consumption of water and chemicals that make the process less hazardous to the environment.

  8. 涤锦织物异色染色实践%Differential dyeing of polyester-polyamide fabrics

    Institute of Scientific and Technical Information of China (English)

    崔浩然

    2013-01-01

    Technical difficulties in differential dyeing of polyester/nylon blended fabric, including the different dyeing temperature of two fibers and staining of nylon fiber, are analyzed.The relavant measures are pointed out as follows:selecting low-energy dyes and carrier for polyester to decrease the dyeing tempetature, stripping the dye on the nylon fiber after polyester disperse dyeing,and then top dyeing.%涤锦织物染异色,存在染色温度不一致和锦纶沾色两大技术难点.通过实例分析,解决的措施是,选用低温型分散染料和适量涤纶导染剂,降低染色温度;涤纶分散染料染色后,对锦纶剥色后再套染.文中还提出了涤锦织物染异色时的注意事项.

  9. The establishment and external validation of NIR qualitative analysis model for waste polyester-cotton blend fabrics.

    Science.gov (United States)

    Li, Feng; Li, Wen-Xia; Zhao, Guo-Liang; Tang, Shi-Jun; Li, Xue-Jiao; Wu, Hong-Mei

    2014-10-01

    A series of 354 polyester-cotton blend fabrics were studied by the near-infrared spectra (NIRS) technology, and a NIR qualitative analysis model for different spectral characteristics was established by partial least squares (PLS) method combined with qualitative identification coefficient. There were two types of spectrum for dying polyester-cotton blend fabrics: normal spectrum and slash spectrum. The slash spectrum loses its spectral characteristics, which are effected by the samples' dyes, pigments, matting agents and other chemical additives. It was in low recognition rate when the model was established by the total sample set, so the samples were divided into two types of sets: normal spectrum sample set and slash spectrum sample set, and two NIR qualitative analysis models were established respectively. After the of models were established the model's spectral region, pretreatment methods and factors were optimized based on the validation results, and the robustness and reliability of the model can be improved lately. The results showed that the model recognition rate was improved greatly when they were established respectively, the recognition rate reached up to 99% when the two models were verified by the internal validation. RC (relation coefficient of calibration) values of the normal spectrum model and slash spectrum model were 0.991 and 0.991 respectively, RP (relation coefficient of prediction) values of them were 0.983 and 0.984 respectively, SEC (standard error of calibration) values of them were 0.887 and 0.453 respectively, SEP (standard error of prediction) values of them were 1.131 and 0.573 respectively. A series of 150 bounds samples reached used to verify the normal spectrum model and slash spectrum model and the recognition rate reached up to 91.33% and 88.00% respectively. It showed that the NIR qualitative analysis model can be used for identification in the recycle site for the polyester-cotton blend fabrics.

  10. Synthesis of Some Novel 2-Amino-5-arylazothiazole Disperse Dyes for Dyeing Polyester Fabrics and Their Antimicrobial Activity

    Directory of Open Access Journals (Sweden)

    Hatem E. Gaffer

    2016-01-01

    Full Text Available The present work describes the synthesis of a series of four novel biologically active 2-amino-5-arylazothiazole disperse dyes containing the sulfa drug nucleus. The structures of the synthesized thiazole derivatives are confirmed using UV-spectrophotometry, infrared and nuclear magnetic resonance techniques and elemental analysis. The synthesized dyes are applied to polyester fabrics as disperse dyes and their fastness properties to washing, perspiration, rubbing, sublimation, and light are evaluated. The synthesized compounds exhibit promising biological efficiency against selected Gram-positive and Gram-negative pathogenic bacteria as well as fungi.

  11. 涤及涤氨针织物色渍现状及其改善途径%Current Situation of Color Staining on Polyester and Polyester/Polyurethane Knitted Fabric and Its Improvement

    Institute of Scientific and Technical Information of China (English)

    刘影; 罗艳; 张国兴; 许畅; 刘星磊; 朱金刚

    2015-01-01

    The research situation of color staining on polyester and polyester polyurethane knitted fabric was ex-pounded. The reasons of forming color staining were theoretically analyzed in respects of water-quality, pretreatment, equipments and operation, dyes, low polymer, auxiliaries and so on. And precautions and methods of improving and removing color staining were put forward which combined with the actual situation of factory with aiming at the dif-ferent reasons. It pointed out that making the correct process route, selecting correct process recipes, conditions and equipments are the important premise when dyeing polyester and polyester polyurethane knitted fabric.%阐述了涤及涤氨针织物色渍的研究现状,从水质、前处理、设备及操作、染料、低聚物助剂等方面对色渍形成的原因进行理论分析,并结合工厂实际情况针对不同原因提出预防措施以及改善或消除色渍的方法。指出了涤及涤氨针织物染色时,制定正确的工艺路线,选择正确的工艺配方、工艺条件和工艺设备,是消除色渍的重要前提。

  12. 儿童睡衣中涤纶及含涤织物阻燃要求探讨%Discuss on Flammability Requirement of Polyester and Polyester Blended Fabric for Children's Nightwear

    Institute of Scientific and Technical Information of China (English)

    陈蕾; 杨剑健; 董激文

    2012-01-01

    目前国外对于儿童睡衣阻燃测试的评价一般采用火焰蔓延时间或损毁长度作为判定依据。比较分析了涤纶、涤棉和棉织物的测试案例,指出儿童睡衣中涤纶及含涤织物阻燃要求应包括燃烧滴落物评价内容,建议我国日后在制定或修订儿童睡衣阻燃标准中应考虑到测试中燃烧滴落物的影响因素。%Presently, the general criterion of childrenr s nightwear is based on flame spread time and char length in foreign. The flame test of polyester, polyester blended and cotton fabric were compared to analysis. It pointed that the flaming debris should be in- cluded in flammability standard of polyester and polyester blended fabric for children's nightwear. The flaming debris was proposed to make or revise the flammability standard of children's nightwear in our country later.

  13. Recycle PET再生涤纶机织面料的染整工艺探讨%Discussion on Dyeing Process of Recycle PET recycled Polyester Woven Fabrics

    Institute of Scientific and Technical Information of China (English)

    薛以强; 李峻

    2015-01-01

    介绍Recycle PET再生涤纶面料在未来的能源利用和循环经济发展中的前景,着重实验并探讨再生涤纶机织面料的前处理和染色工艺,对其前处理精练退浆剂、分散染料等选择提出有效的实验方法,本文提出一些改善再生涤纶面料在染整过程中的染色均匀性、布面平整、批差等问题,为再生涤纶面料的染整开发提供了一定的实践经验。%Introduce Recycle PET recycled polyester fabric in the future prospects of energy use and economic development cycle, focusing experiment and explore renewable pretreatment and dyeing polyester woven fabric, and propose effective pretreatment scouring desizing agent, disperse dyes and other options for its experimental methods, this paper presents some improvements recycled polyester fabric dyeing process in dyeing uniformity, fabric formation, batch and poor, for the development of recycled polyester fabric dyeing and provide some practical experience.

  14. Research on Electroless Silver Conductive Polyester Fabric%化学镀银导电涤纶织物的研究

    Institute of Scientific and Technical Information of China (English)

    董猛; 田俊莹; 江红

    2016-01-01

    Conductive polyester fabric was prepared by electroless silver plating with glucose as a reducing a-gent.The effects of concentration of silver nitrate, glucose concentration, ethanol concentration and reaction time on the conductive properties of polyester fabric were studied.The surface morphology and crystal structure of the silver coating were investigated by SEM and XRD.And electromagnetic shielding performance was also tested. The results showed that electroless silver plating polyester fabric had excellent electrical conductivity and electro-magnetic shielding performance of polyester fabric was remarkably improved by electroless silver plating.%以葡萄糖为还原剂,采用化学镀银法制备导电涤纶织物,研究了硝酸银浓度、葡萄糖浓度、乙醇浓度及反应时间对涤纶织物导电性能的影响,通过SEM和XRD图谱分析导电织物表面形貌与晶体结构,并测试其电磁屏蔽性能。结果表明,化学镀银涤纶织物具有优异的导电性能,且化学镀银后涤纶织物的电磁屏蔽性能明显增加。

  15. Effect of polyester blends in hydroentangled raw and bleached cotton nonwoven fabrics on the adsorption of alkyl-dimethyl-benzyl-ammonium chloride

    Science.gov (United States)

    The adsorption kinetics and isotherms of alkyl-dimethyl-benzyl-ammonium chloride (ADBAC), a cationic surfactant commonly employed as an antimicrobial agent, on hydroentangled nonwoven fabrics (applicable for wipes) including raw cotton, bleached cotton, and their blends with polyester (PES) were stu...

  16. Mechanical properties and fabrication of small boat using woven glass/sugar palm fibres reinforced unsaturated polyester hybrid composite

    Science.gov (United States)

    Misri, S.; Leman, Z.; Sapuan, S. M.; Ishak, M. R.

    2010-05-01

    In recent years, sugar palm fibre has been found to have great potential to be used as fibre reinforcement in polymer matrix composites. This research investigates the mechanical properties of woven glass/sugar palm fibres reinforced unsaturated polyester hybrid composite. The composite specimens made of different layer of fibres such as strand mat, natural and hand woven of sugar palm fibres. The composites were fabricated using a compression moulding technique. The tensile and impact test was carried out in accordance to ASTM 5083 and ASTM D256 standard. The fibre glass boat is a familiar material used in boat industry. A lot of research on fabrication process such as lay-up, vacuum infusion mould and resin transfer mould has been conducted. Hybrid material of sugar palm fibre and fibre glass was used in fabricating the boat. This research investigates the method selection for fabrication of small boat application of natural fibre composites. The composite specimens made of different layer of fibres; woven glass fibre, strand mat, natural and hand woven of woven sugar palm fibres were prepared. The small boat were fabricated using a compression moulding and lay up technique. The results of the experiment showed that the tensile strength, tensile modulus, elongation at break value and impact strength were higher than the natural woven sugar palm fibre. The best method for fabricating the small boat was compression moulding technique. As a general conclusion, the usage of glass fibre had improved the tensile properties sugar palm fibre composites and compression moulding technique is suitable to be used in making a small boat application of natural fibre composites.

  17. Preparation and application of sericin protein modifier on polyester fabrics%丝胶改性剂的制备及对涤纶的改性研究

    Institute of Scientific and Technical Information of China (English)

    戴杰; 郭晓玲; 周青青; 本德萍; 崔贞; 申国栋

    2014-01-01

    以环氧氯丙烷、丝胶蛋白为原料,在碱性条件下制备新型丝胶改性剂.丝胶改性剂与涤纶织物上的羧基发生酯化反应并固着于涤纶织物上,改善涤纶织物的抗静电性、吸湿性等性能.对整理后涤纶织物的抗静电性、透气性、毛细效应、接触角、强力等进行测试.结果表明:改性涤纶织物的抗静电性得到改善,表面电荷由原来的0.036μC变为0.001μC;多次水洗后,涤纶织物表面电荷基本稳定,说明丝胶改性剂与涤纶织物上的羧基发生酯化反应,并固着在涤纶织物上;透气性由原来的19.43 mm/s变为46.29 mm/s.%A novel sericin modifier was prepared using epichlorohydrin and sericin protein as raw materi-als under alkaline condition. The sericin modifier reacted with the carboxyl groups on polyester fabric through esterification reaction and fixed onto the fabrics, improving the antistatic and hygroscopic properties of polyes-ter fabrics. The antistatic, gas permeability, capil ary effect, contact angle and strength of finished polyester fab-ric were tested. The results showed that the antistatic property of modified polyester fabric was improved and the surface charge changed from 0.036 μC to 0.001 μC. After repeated launderings, the surface charge on the finished polyester remained steady showing the esterification reaction between the sericin modifier with the carboxyl groups on polyester fabrics. The gas permeability also increased from 19.43 mm/s to 46.29 mm/s.

  18. Abaca/polyester nonwoven fabric functionalization for metal ion adsorbent synthesis via electron beam-induced emulsion grafting

    Science.gov (United States)

    Madrid, Jordan F.; Ueki, Yuji; Seko, Noriaki

    2013-09-01

    A metal ion adsorbent was developed from a nonwoven fabric trunk material composed of both natural and synthetic polymers. A pre-irradiation technique was used for emulsion grafting of glycidyl methacrylate (GMA) onto an electron beam irradiated abaca/polyester nonwoven fabric (APNWF). The dependence of degree of grafting (Dg), calculated from the weight of APNWF before and after grafting, on absorbed dose, reaction time and monomer concentration were evaluated. After 50 kGy irradiation with 2 MeV electron beam and subsequent 3 h reaction with an emulsion consisting of 5% GMA and 0.5% polyoxyethylene sorbitan monolaurate (Tween 20) surfactant in deionized water at 40 °C, a grafted APNWF with a Dg greater than 150% was obtained. The GMA-grafted APNWF was further modified by reaction with ethylenediamine (EDA) in isopropyl alcohol at 60 °C to introduce amine functional groups. After a 3 h reaction with 50% EDA, an amine group density of 2.7 mmole/gram adsorbent was achieved based from elemental analysis. Batch adsorption experiments were performed using Cu2+ and Ni2+ ions in aqueous solutions with initial pH of 5 at 30 °C. Results show that the adsorption capacity of the grafted adsorbent for Cu2+ is four times higher than Ni2+ ions.

  19. Sonochemical coating of silver nanoparticles on textile fabrics (nylon, polyester and cotton) and their antibacterial activity

    Energy Technology Data Exchange (ETDEWEB)

    Perelshtein, Ilana; Applerot, Guy; Perkas, Nina; Gedanken, Aharon [Department of Chemistry, Kanbar Laboratory for Nanomaterials, Institute of Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan 52900 (Israel); Guibert, Geoffrey; Mikhailov, Serguei [Haute Ecole Arc Ingenierie IMA-Arc, NEODE, 17 Eplatures-Grise, CH-2300 La Chaux-de-Fonds (Switzerland)], E-mail: gedanken@mail.biu.ac.il

    2008-06-18

    Silver nanoparticles were synthesized and deposited on different types of fabrics using ultrasound irradiation. The structure of silver-fabric composites was studied by physico-chemical methods. The mechanism of the strong adhesion of silver nanoparticles to the fibers is discussed. The excellent antibacterial activity of the Ag-fabric composite against Escherichia coli (gram-negative) and Staphylococcus aureus (gram-positive) cultures was demonstrated.

  20. Research on tensile fracture process of polyester woven fabric based on AE technique and HHT

    Directory of Open Access Journals (Sweden)

    Yajing XUE

    2016-10-01

    Full Text Available In order to obtain and study time-frequency characteristics of fabric tensile failure modes, four kinds of fabrics is woven with changing different fabric organizational structures and weft densities, dynamic audio signals for different fabrics in tensile failure process is collected with the aid of self-built acoustic emission detection system on the conventional fabric tensile tester, and the collected signal is analyzed and processed by using Matlab software to run a program compiled based on Hilbert Huang transform. The results show that AE signal curve is completely corresponding to tensile load-displacement curve in fabric tensile process, and characterizations of three failure modes about structure change, yarn deformation, and yarn fracture can be clearly distinguished. The characteristic frequency of four kinds of fabrics in structure change stage is the same as 100 Hz, which can be derived from the same source (orthogonal friction of yarns, and has nothing to do with the fabric organizational structure or density. The structure change stage has something to do with yarn strength utilization in such aspects as the AE signals characteristics of duration, amplitude, energy, and so on.

  1. Modification of Polyester and Polyamide Fabrics by Different in Situ Plasma Polymerization Methods

    OpenAIRE

    ÖKTEM, T.; SEVENTEKİN, N.

    2000-01-01

    In order to increase the hydrophilicities, and therefore to impart soil resistance and to improve dyeability, poly(ethylene terephthalate) (PET) and polyamide (PAm) fabrics were treated in low-temperature plasmas. Five different modification types were applied. Fabrics were directly treated in acrylic acid, water, air, O2 and argon plasma. The plasma conditions (i.e., exposure time and discharge power) were changed to control the extent of plasma surface modification. Wettability, soil resist...

  2. Experimental Study on the Polyester-Cotton Blended Fabrics' Flame Retardancy%涤棉混纺织物阻燃性能的实验分析

    Institute of Scientific and Technical Information of China (English)

    章梦洁; 伍仲; 方园

    2013-01-01

    In the light of the problem that it's difficult to apply flame retardant finish to cotton-polyester blended fabric as a result of wick effect, the authors adopt a new type of flame retardant to finish the fabric. Additionally, the compositions of fire retardant will coordinate to achieve flame retardancy. Based on this, the authors utilize orthogonal experiment to analyze the way in which how blending ratio, fabric density and fabric structure affect the flame retardant performance of cotton-polyester blended fabric. It turns out that the vertical burning damage length is from 40 to 47 mm, which is less than 50 mm, and the limiting oxygen index is greater than 27. 5, which reaches the requirements for flame retardancy. The flame retardant performance of cotton-polyester blended fabric is closely related to the contents of the fire retardant and the way to apply fire retardant finish. It also proves that the flame retardant performance of cotton-polyester blended fabric increases and then decreases when the contents increase, the performance is positively correlated to the density of fabric, while the fabric structure does not significantly connect with it.%针对涤棉混纺织物“烛芯效应”而引起的阻燃整理难度大的问题,采用复合新型阻燃剂复配技术对涤棉混纺织物进行阻燃处理.通过正交试验的方法综合分析了混纺比、织物密度、织物组织结构等影响因素与涤棉织物阻燃性能之间的关联性.研究结果表明,经复配阻燃处理后的涤棉混纺织物的垂直燃烧损毁长度在40~47 mm范围内,均<50 mm,极限氧指数均>27.5,达到难燃织物的标准;随着织物中涤纶含量的增加,阻燃性能先增大后减小,涤纶含量为35%时阻燃效果最好;阻燃性能与织物密度正相关,而织物组织结构对阻燃影响并不显著.

  3. Wearable Electricity Generators Fabricated Utilizing Transparent Electronic Textiles Based on Polyester/Ag Nanowires/Graphene Core-Shell Nanocomposites.

    Science.gov (United States)

    Wu, Chaoxing; Kim, Tae Whan; Li, Fushan; Guo, Tailiang

    2016-07-26

    The technological realization of wearable triboelectric generators is attractive because of their promising applications in wearable self-powered intelligent systems. However, the low electrical conductivity, the low electrical stability, and the low compatibility of current electronic textiles (e-textiles) and clothing restrict the comfortable and aesthetic integration of wearable generators into human clothing. Here, we present high-performance, transparent, smart e-textiles that employ commercial textiles coated with silver nanowire/graphene sheets fabricated by using a scalable, environmentally friendly, full-solution process. The smart e-textiles show superb and stable conduction of below 20 Ω/square as well as excellent flexibility, stretchability, foldability, and washability. In addition, wearable electricity-generating textiles, in which the e-textiles act as electrodes as well as wearable substrates, are presented. Because of the high compatibility of smart e-textiles and clothing, the electricity-generating textiles can be easily integrated into a glove to harvest the mechanical energy induced by the motion of the fingers. The effective output power generated by a single generator due to that motion reached as high as 7 nW/cm(2). The successful demonstration of the electricity-generating glove suggests a promising future for polyester/Ag nanowire/graphene core-shell nanocomposite-based smart e-textiles for real wearable electronic systems and self-powered clothing.

  4. Hydrophilic modification of polyester fabric by applying nanocrystalline cellulose containing surface finish.

    Science.gov (United States)

    Zaman, Masuduz; Liu, Hongbin; Xiao, Huning; Chibante, Felipe; Ni, Yonghao

    2013-01-16

    In this study, polyethylene terephthalate (PET) fabric was modified by applying a hydrophilic surface finishing agent that contains nanocrystalline cellulose (NCC). To impart superior hydrophilicity, NCC was further cationically modified through quaternization by grafting glycidyl tri-methyl ammonium chloride (GTMAC). A textile binder, PrintRite595(®), was added to the finishing system. The surface finish was applied on the fabric using a rolling-drying-curing process. The modified fabric was characterized in terms of coating durability, moisture regain, and wettability. The durability of the surface finish was tested by six repeated washing steps. The surface properties of the fabric changed from hydrophobic to hydrophilic after heat treatment with the NCC-containing surface finishing agent. The results from the washing fastness, SEM, FTIR, and EDX analyses confirmed that the cationic NCC-containing textile surface finish showed superior adhesion onto the cationic dyeable (anionic) PET surface over the un-modified NCC. Furthermore, the cationic textile surface finish was capable of withstanding multiple washing cycles. Copyright © 2012 Elsevier Ltd. All rights reserved.

  5. Surface characteristics of coated polyester fabric with reduced graphene oxide and polypyrrole

    Energy Technology Data Exchange (ETDEWEB)

    Berendjchi, Amirhosein [Department of Textile Engineering, Science and Research Branch, Islamic Azad University, Tehran (Iran, Islamic Republic of); Khajavi, Ramin, E-mail: khajavi@azad.ac.ir [Nano Technology Research Center, South Tehran Branch, Islamic Azad University, Tehran (Iran, Islamic Republic of); Yousefi, Ali Akbar [Faculty of Polymer Processing, Iran Polymer and Petrochemical Institute, Tehran (Iran, Islamic Republic of); Yazdanshenas, Mohammad Esmail [Department of Textile Engineering, Yazd Branch, Islamic Azad University, Yazd (Iran, Islamic Republic of)

    2016-03-30

    Graphical abstract: - Highlights: • PET in form of film or membrane is hydrophobic and its wetting behavior follows the Wenzel wetting theory. In the form of textile materials it shows hydrophilicity. • rGO coated PET fabric shows hydrophobicity and its wetting behavior places between Wenzel and Cassie–Baxter models. • PET coated fabric by PPy shows superhydrophobicity and its wetting behavior is consistence with Cassie–Baxter model. • Due to oxidation of the rGO during in situ synthesis of PPy the rGO–PPy coated PET shows hydrophilicity. - Abstract: In this study, the influence of coating polyethylene terephthalate (PET) fabric with reduced graphene oxide (rGO) and polypyrrole (PPy), individually or in combination (rGO–PPy), on surface chemistry and roughness (focusing on wetting behavior), were analyzed systematically. Characterization was carried out by observing the topography (atomic force microscopy – AFM) and stating surface analysis (X-ray photoelectron spectroscopy – XPS), contact angles (goniometry), water shedding angles, and surface energy values of the samples. The results showed that the contact angles of pristine (uncoated), GO and rGO–PPy coated samples were 0°, while it was 92°, 123° and 151° for hot pressed (2nd pristine sample), rGO and PPy samples, respectively. A zero contact angle for PET sample was due to its wicking ability. Results were interpreted with Young, Wenzel and Cassie Baxter equations. It was found that PPy coated samples were consistent with Cassie–Baxter equation, while rGO placed between Wenzel and Cassie–Baxter wetting models.

  6. Vapor-Liquid Sol-Gel Approach to Fabricating Highly Durable and Robust Superhydrophobic Polydimethylsiloxane@Silica Surface on Polyester Textile for Oil-Water Separation.

    Science.gov (United States)

    Su, Xiaojing; Li, Hongqiang; Lai, Xuejun; Zhang, Lin; Wang, Jing; Liao, Xiaofeng; Zeng, Xingrong

    2017-08-23

    Large-scale fabrication of superhydrophobic surfaces with excellent durability by simple techniques has been of considerable interest for its urgent practical application in oil-water separation in recent years. Herein, we proposed a facile vapor-liquid sol-gel approach to fabricating highly durable and robust superhydrophobic polydimethylsiloxane@silica surfaces on the cross-structure polyester textiles. Scanning electron microscopy and Fourier transform infrared spectroscopy demonstrated that the silica generated from the hydrolysis-condensation of tetraethyl orthosilicate (TEOS) gradually aggregated at microscale driven by the extreme nonpolar dihydroxyl-terminated polydimethylsiloxane (PDMS(OH)). This led to construction of hierarchical roughness and micronano structures of the superhydrophobic textile surface. The as-fabricated superhydrophobic textile possessed outstanding durability in deionized water, various solvents, strong acid/base solutions, and boiling/ice water. Remarkably, the polyester textile still retained great water repellency and even after ultrasonic treatment for 18 h, 96 laundering cycles, and 600 abrasion cycles, exhibiting excellent mechanical robustness. Importantly, the superhydrophobic polyester textile was further applied for oil-water separation as absorption materials and/or filter pipes, presenting high separation efficiency and great reusability. Our method to construct superhydrophobic textiles is simple but highly efficient; no special equipment, chemicals, or atmosphere is required. Additionally, no fluorinated slianes and organic solvents are involved, which is very beneficial for environment safety and protection. Our findings conceivably stand out as a new tool to fabricate organic-inorganic superhydrophobic surfaces with strong durability and robustness for practical applications in oil spill accidents and industrial sewage emission.

  7. Ultrasound mediation for one-pot sonosynthesis and deposition of magnetite nanoparticles on cotton/polyester fabric as a novel magnetic, photocatalytic, sonocatalytic, antibacterial and antifungal textile.

    Science.gov (United States)

    Rastgoo, Madine; Montazer, Majid; Malek, Reza M A; Harifi, Tina; Mahmoudi Rad, Mahnaz

    2016-07-01

    A magnetic cotton/polyester fabric with photocatalytic, sonocatalytic, antibacterial and antifungal activities was successfully prepared through in-situ sonosynthesis method under ultrasound irradiation. The process involved the oxidation of Fe(2+) to Fe(3+) via hydroxyl radicals generated through bubbles collapse in ultrasonic bath. The treated samples were analyzed by X-ray diffraction, field emission scanning electron microscopy, energy dispersive X-ray spectroscopy and vibrating sample magnetometry. Photocatalytic and sonocatalytic activities of magnetite treated fabrics were also evaluated toward Reactive Blue 2 decoloration under sunlight and ultrasound irradiation. Central composite design based on response surface methodology was applied to study the influence of iron precursor, pH and surfactant concentration to obtain appropriate amount for the best magnetism. Findings suggested the potential of one-pot sonochemical method to synthesize and fabricate Fe3O4 nanoparticles on cotton/polyester fabric possessing appropriate saturation magnetization, 95% antibacterial efficiency against Staphylococcus aureus and 99% antifungal effect against Candida albicans, 87% and 70% dye photocatalytic and sonocatalytic decoloration along with enhanced mechanical properties using only one iron rich precursor at low temperature.

  8. Polyester non-woven fabric finger cover as a TRUCT Braille reading assistance tool for Braille learners.

    Science.gov (United States)

    Doi, Kouki; Fujimoto, Hiroshi

    2007-11-01

    Transparent resinous ultraviolet-curing type (TRUCT) Braille signs are becoming more and more popular in Japan, especially when they are printed together with visual characters. These signs are made by screen printing, a technique that can be applied to various base materials, such as paper, metal, and plastic. TRUCT Braille signs have begun to be used in public facilities, such as on tactile maps and on handrails. Naturally, it is expected that Braille beginners will utilize these signs. However, it has been pointed out that the friction between the forefinger and the base material may affect reading accuracy and speed. In this study, we developed a finger cover made of soft, thin polyester non-woven fabric to reduce friction during Braille reading. We also carried out a study to investigate the effect of its use. The subjects were 12 Braille learners with acquired visual impairment, who were asked to read randomly selected characters with and without the finger cover. The results showed that most participants could read TRUCT Braille significantly faster and more accurately with a finger cover than without it, regardless of the base material and dot height. This result suggests that wearing the finger cover enables Braille learners to read TRUCT Braille more efficiently. The finger cover can be used as a Braille reading assistance tool for Braille learners. An additional, health-related advantage of the finger cover is that the forefinger remains clean. We expect that the finger cover will be in practical use in Japan within 1 or 2 years.

  9. Preparation and Properties of Conductive, Superhydrophobic and Oleophobic Polyester Fabrics%导电双疏涤纶织物制备与性能研究

    Institute of Scientific and Technical Information of China (English)

    冯磊; 徐壁; 蔡再生

    2015-01-01

    目的:制备具有良好导电性能的超疏水疏油纺织品。方法首先利用化学镀方法在涤纶织物表面镀铜,构筑微米-亚微米粗糙结构,然后利用全氟辛基三甲氧基硅烷( PFTMS )通过化学气相沉积方法在镀铜织物表面覆盖一层低表面能基团,制备导电超疏水疏油织物。采用电子扫描电镜( SEM)、能量色散X射线光谱仪( EDXS)、接触角测试仪和方阻测试仪对其表面形貌、表面元素分布、疏水疏油性、导电性能进行研究。结果 PFTMS修饰的镀Cu织物导电性能优异,方阻为230 mΩ左右,织物抗紫外线指数达到50+;织物与水滴接触角达152.0°,与十六烷油滴接触角达120.7°。结论将化学镀和化学气相沉积法相结合,在涤纶纤维表面化学镀铜并用PFTMS进行低表面能物质修饰,可以成功制备具有导电功能的超疏水疏油纺织品。%ABSTRACT:Objective To prepare superhydrophobic and oleophobic textile fabrics with good conductive property. Methods The surface of polyester fabric was first coated with copper using the chemical copper-plating method to build a micron-submicron struc-ture. Then the superhydrophobic and oleophobic conductive fabrics were fabricated through chemical vapor deposition of 1H,1H, 2H,2H-perfluorooctyltrimethoxysilane (PFTMS) to generate a layer of low surface energy group on the surface of the Cu-planted polyester fabrics. The properties of amphiphobic polyester fabrics including surface morphology, element distribution, amphipho-bicity and electrical conductivity were investigated with scanning electron microscope ( SEM) , energy dispersive X-ray spectroscopy ( EDXS) , contact angle tester and square resistance tester. Results It showed that the PFTMS-Cu-modified polyester fabrics had outstanding conductive capability, the sheet resistance was about 230 mΩ, and the resistance to UV performance was up to 50+. The contact angles of the modified polyester fabrics

  10. Preparation of Fabric Sensor for Heart Signal Acquisition Using Printing and Electroless Plating of Copper on Polyester Fabric

    Directory of Open Access Journals (Sweden)

    F. Haghdoost

    2015-07-01

    Full Text Available In the last decade, a significant progress has been made in the wearable medical devices. Scientists are extensively involved in the design of the flexible instruments equipped with garments to fulfill the daily needs and requirements. The fulfillment of this demand particularly needs a conductive fabric substrate with a high level of homogeneity, and the lowest barrier against electrical current. In this study, textile based ECG electrode was prepared by screen printing of activator followed by electroless plating of copper particles. The data acquisition showed the best outcome with pH=8.5 and the plating temperature of 70 ˚C. The electrical resistance showed a range around 0.08 Ω/sq, which sounds quite proper for ECG signal acquisition since the potential difference according to heart activity on skin surface is in milivolt range. We tested the cardiac signal with a reference electrode of Electroshock monitoring system and the results revealed a very high quality receiving signal. Employing of these types of sensors in textile surface due to their flexibility can bring the users more freedom of action.

  11. Application of the antistatic agent P on polyester fabric%抗静电剂P在涤纶织物上的应用

    Institute of Scientific and Technical Information of China (English)

    刘晓云; 钟少锋; 王晓芳

    2012-01-01

    The antistatic properties and application process of self-made finishing agent P on polyester fabric were investigated. The color shade, color fastness and wearabilities of treated fabrics were further discussed. The antistatic properties of polyester fabrics were examined by measuring the peak value of the static voltage, its half life and the contact angle, and the durability of the antistatic property of the fabrics after 20 washing cycles. The effect of finishing agent on the wearabilities of polyester fabrics was further discussed by measuring the bending length, air permeability and breaking strength. The effects of finishing agent on the hue and color fastness of dyed fabric were investigated through measuring the K/S value, color difference, color fastness to rubbing and washing. The results indicate that the finishing agent P shows excellent antistatic properties and washing durability. The optimized conditions were: finishing agent P 5 g/L, two dipping and padding with 70%~75% of pick-up, drying temperature 70 ℃. The polyester fabric retained good handle, but the air permeability and breaking strength decreased slightly, which would not affect the wearability. The effect of finishing agent on the color shade and color fastness was very little.%研究了自制整理剂P在涤纶织物上的应用工艺和抗静电性能,并对其整理织物的色光、色牢度以及服用性能进行分析探讨.通过测量静电峰值电压、半衰期、接触角分析整理织物抗静电性能,检测经20次洗涤后抗静电性能的耐久性.测定抗弯长度、透气率和断裂强度,分析整理剂对涤纶织物服用性能的影响.测定整理前后织物的K/S值、色差、耐洗牢度和耐摩擦牢度,研究整理剂对染色织物色光和染色牢度的影响.结果表明:抗静电剂P整理的涤纶织物具有优良的抗静电性能和耐洗性能.无需焙烘工艺,最佳应用工艺为整理剂P5g/L,二浸二轧,轧余率70%~75%,70℃烘

  12. Improved continuity of reduced graphene oxide on polyester fabric by use of polypyrrole to achieve a highly electro-conductive and flexible substrate

    Energy Technology Data Exchange (ETDEWEB)

    Berendjchi, Amirhosein [Department of Textile Engineering, Science and Research Branch, Islamic Azad University, Tehran (Iran, Islamic Republic of); Khajavi, Ramin, E-mail: khajavi@azad.ac.ir [Nano Technology Research Center, South Tehran Branch, Islamic Azad University, Tehran (Iran, Islamic Republic of); Yousefi, Ali Akbar [Faculty of Polymer Processing, Iran Polymer and Petrochemical Institute, Tehran (Iran, Islamic Republic of); Yazdanshenas, Mohammad Esmail [Department of Textile Engineering, Yazd Branch, Islamic Azad University, Yazd (Iran, Islamic Republic of)

    2016-02-15

    Graphical abstract: - Highlights: • Discontinuity of reduced graphene oxide (RGO) coated polyester fabric (PET) substrate was overcome by filling the gaps by in situ chemical oxidative polymerization of polypyrrole (PPy). • The RGO–PPy coated samples exhibited 53% and 263% lower surface resistivity values (5 Ω/sq) than samples coated only with PPy (12 Ω/sq) and RGO (1300 Ω/sq), respectively. • The RGO–PPy coated fabric displayed other properties, such as excellent UV blocking (UPF = 73), antibacterial activity, improved electrochemical behavior and thermal stability which make it a multifunctional fabric. - Abstract: A flexible and highly conductive fabric can be applied for wearable electronics and as a pliable counter electrode for photovoltaics. Methods such as surface coating of fabrics with conductive polymers and materials have been developed, but the roughness of fabric is a challenge because it creates discontinuity in the coated layer. The present study first coated polyethylene terephthalate (PET) fabric with reduced graphene oxide sheets; RGO and then filled the gaps with polypyrrole (PPy). The samples were first dipped in graphene oxide (GO) and then reduced to RGO. They were next coated with PPy by in situ polymerization. The results showed that the presence of oxidative agent during synthesis of PPy oxidized the RGO to some extent on the previously RGO-coated samples. PPy was more uniform on samples pre-coated with RGO in comparison those coated with raw PET. The RGO–PPy coated samples exhibited 53% and 263% lower surface resistivity values than samples coated only with PPy and RGO, respectively. There was no significant difference between the tenacity of samples but the bending rigidity of samples increased. The RGO–PPy coated fabric displayed properties, such as excellent UV blocking (UPF = 73), antibacterial activity, improved electrochemical behavior and thermal stability which make it a multifunctional fabric.

  13. 咖啡炭改性涤纶混纺织物的开发%Development of Coffee Charcoal Modified Polyester Fiber Blended Fabric

    Institute of Scientific and Technical Information of China (English)

    王永凤; 孙晶; 孙瑞芙

    2013-01-01

    Production points of coffee charcoal modified polyester fiber blended fabric were discussed.Coffee charcoal modified polyester fiber and yarn quality index were introduced.According to fabric design property,processing principle of middle tension and elongation was adopted in warping process.Processing line of double-dip double-pressure was adopted and S432 sizing machine was used,sizing instruction was optimized.Warp shed line was adjusted rationally in weaving process,loom speed is 575 r/min,finally loom efficiency can be reached above 80%.After testing,thermal insulation and antibacterial function of the fabric is better.%探讨咖啡炭改性涤纶混纺织物的生产要点.介绍了咖啡炭改性涤纶纤维及其成纱的质量指标.针对织物设计特点,整经工序采取中张力,中伸长的工艺原则;浆纱工序采用S432型浆纱机以及双浸双压的工艺路线,并优化浆料配方;织造工序合理调整经位置线,织机速度采用575 r/min,最终使织机效率达到80%以上.经检测,织物具有较好的抑菌、保温等功能.

  14. 改性涤纶/锦纶莱卡织物的染色工艺探讨%The investigation of the dyeing process of modified polyester/nylon lycra fabric

    Institute of Scientific and Technical Information of China (English)

    彭志忠

    2014-01-01

    针对(阳离子)改性涤纶和锦纶莱卡的性能与面料特点,分析了阳离子改性涤纶/锦纶莱卡面料的一浴法和两浴法染色工艺。实践表明:阳离子改性涤纶/锦纶可以解决传统涤/锦氨纶面料的染色问题。介绍阳离子染料可染涤纶(CDP)与锦氨织物的染整工艺和影响产品质量的因素。%The one bath and two bath dyeing process of the cationic modified polyester/nylon lycra fabric were analyzed according to the performances and characteristics. It was found that the cationic modification of polyester/nylon lycra fabric can solve the dyeing problems brought by the conventional polyester/nylon lycra fabric. The dyeing process and factors affected the products quality of cationic dyeable polyester (CDP)/nylon/spandex fabrics were introduced.

  15. 湿法涂层制备涤纶洁净服面料%Polyester cleanroom fabrics prepared by wet coating process

    Institute of Scientific and Technical Information of China (English)

    高静; 沈安京; 李芮

    2009-01-01

    采用聚偏氟乙烯(PVDF)涂层液对涤纶织物进行湿法涂层以制备洁净服面料,讨论各工艺因素对涂层面料性能的影响.试验获得的优化工艺条件为:PVDF用量14%,添加剂LiCl 3%,预挥发时间30s,凝固浴的组成为氯化钠:去离子水=5:95,涂层量5-7g/m~2.采用优化工艺制得的洁净服面料,滤尘性高达90%,透湿和透气性也较好.%Polyester cleanroom fabrics were prepared by wet coating process using polyvinylidene fluoride. The effects of process conditions on the coated fabric properties were studied. It was found that the optimum process conditions were as fol-lows: PVDF mass fraction 14%, LiCI 3%, pre-evaporating time 30 s, the composition of coagulation bath NaCI: H_2O =5 :95,coating amounts 5 ~ 7 g/m~2. The particle filtration of the dustproof fabric was as high as 90%; the moisture and air permeabili-ty were excellent meanwhile.

  16. An Infra-Red Heating Based Fast Method of Moisture Content Measurement and Its Application to Measure Blend Proportion of Polyester-Viscose Woven Fabrics

    Directory of Open Access Journals (Sweden)

    V.K. Kothari

    2010-06-01

    Full Text Available Moisture content values of plain woven fabrics of polyester-viscose blended yarns were measured using standard conditioning procedures as well as a new method of preconditioning of samples using infra-red heating and subsequent conditioning in a desiccator for a specific conditioning time. The effects of drying time and conditioning time on measured moisture content values were studied and optimization of these parameters were done. Results of the moisture content measurement using these methods show a sufficiently linear relationship between measured moisture content and the proportion of viscose in the fabric samples. The regression analysis showed very high coefficients of determination (above 0.98 in all cases. Regression equations were used to predict the blend proportion of fabric samples from the moisture content data. It was found that even the moisture content values using a shorter conditioning time of 60 minutes and even 10 minutes yielded correct prediction with a maximum error of magnitude less than 3.0 in blend percentage values.

  17. Flame-Retarding of Cotton/Polyester Blended Yarn Fabrics Using Two-Component Sequential Treatment; Nidankai shori ni yoru men/poriesuteru konboshifu no nannenka

    Energy Technology Data Exchange (ETDEWEB)

    Kubokawa, Hiroo. [Textile Research Institute of Gunma Prefecture, Gunma (Japan)

    1999-01-10

    Cotton/polyester (C/P) blended yarn fabrics were treated with several flame retardants used for poly (ethylene terephthalate)(PET) using pad-dry-cure method. The relationships between the chemical structures of the flame retardants and their partition into PET fibers were investigated. When tetrabromobisphenol A (TBP-A) was tested, the amount of sorption increased with increasing concentration of TBP-A in treating acetone solution, and reached 4.0%o.w.f. (% on the weight of the fibre) at 10 wt%. THis treated fabric was again treated with a flame retardant for cotton, Pyrovatex CP New, which contains dimethyl 2-(N-hydroxymethylcarbamovl)ethylphosphonate as a main component. However, sufficient flame retardancy was not obtained. The second partition of TBP-A to cotton during heating was thought to lower the sorption efficiency of Pyrovatex CP New. Based on this assumption, for the case of the two-component sequential treatment, the Pyrovatex CP New treatment, which generates covalent bonds with hydroxy groups of cellulose, should be carried out prior to the TBP-A treatment. When a C/P blended yarn fabric was treated with Pyrovatex CP New and then with TBP-A, the amount of sorption of Pyrovatex CP New was 9.6%o.w.f. and the amount of sorption of TBP-A was 4.6%o.w.f. The limiting oxygen index of the treated fabric was 27.2%, a sufficient value for flame retardancy. Fromthis result, it was concluded that the practica flame-retardant finishing of c/p blended yarn fabrics could be carried out by using a simple finishing machine. (author)

  18. Synthesis and antibacterial activity of some new 3-hydroxy-2-naphthoic acid hydrazide derivatives for dyeing polyester fabrics

    Directory of Open Access Journals (Sweden)

    Abd El-Galil M. Khalil

    2016-03-01

    Full Text Available Dibenzobarallene was used as a key intermediate for the synthesis of 2-(3-hydroxy-2-naphthoyl-3,4,4a,5,10,10a-hexahydro-1H-5,10-benzenobenzo[g]phthalazine-1,4-dione (2. The previous compound was coupled with the appropriate diazonium chloride to give the corresponding 4-arylazo-2-naphthol derivatives 3a–l. Also, nitration, nitrosation and bromination of compound 2 afforded the corresponding nitro, nitroso and bromo derivatives 4–6, respectively. The synthesized compounds were established and evaluated as antibacterial agents. The results showed clearly that compounds 2, 3a, 3c, 3d, 3g, 3i, 4, 5 and 6 exhibited interesting high activities compared with reference drugs. Also, these compounds were applied to polyester as disperse dyes in which their color measurement and fastness properties were evaluated.

  19. Optimization research about polyester/cotton fabric soil release finish process%涤棉织物易去污整理工艺优化

    Institute of Scientific and Technical Information of China (English)

    姚永旺; 闫英山; 李玉华; 李春光; 吕建品

    2015-01-01

    The soil release finishing agent and softer for polyester/cotton fabric soil release finishing were optimized, and the soil release property was improved by the synergistic effect of soil release finishing agent and polyether derivative HP and optimization of technological conditions. The soil release finishing process for cotton fabric is that cotton fabric was baked for 2 min under 160 ℃ with soil release agent SR-7000 60 g/L, polyether derivative HP 30 g/L, softer HF 103 30 g/L, easy care finishing agent EFR 80 g/L, catalyzer 531 20 g/L, and strong protective agent HLC 30 g/L. The soil release property of finished fabric is 3.5 scale after 30 times washing.%在涤棉织物的易去污整理过程中对易去污整理剂、柔软剂进行优选,通过易去污整理剂与聚醚衍生物HP协同作用和优化工艺条件提高织物易去污效果.涤棉织物易去污整理工艺条件:易去污整理剂SR-7000 60 g/L,聚醚衍生物HP 30 g/L,柔软剂HF103 30 g/L,免烫整理剂EFR 80 g/L,催化剂531 20 g/L,强力保护剂HLC 30 g/L,焙烘温度160 ℃ ,焙烘时间2 min.整理后的织物30次水洗后易去污效果3.5级.

  20. Chemical, electrical and electrochemical characterization of hybrid organic/inorganic polypyrrole/PW{sub 12}O{sub 40}{sup 3-} coating deposited on polyester fabrics

    Energy Technology Data Exchange (ETDEWEB)

    Molina, J.; Fernandez, J.; Rio, A.I. del; Bonastre, J. [Departamento de Ingenieria Textil y Papelera, EPS de Alcoy, Universitat Politecnica de Valencia, Plaza Ferrandiz y Carbonell s/n, 03801 Alcoy (Spain); Cases, F., E-mail: fjcases@txp.upv.es [Departamento de Ingenieria Textil y Papelera, EPS de Alcoy, Universitat Politecnica de Valencia, Plaza Ferrandiz y Carbonell s/n, 03801 Alcoy (Spain)

    2011-09-15

    A study of the stability of conducting fabrics of polyester (PES) coated with polypyrrole/PW{sub 12}O{sub 40}{sup 3-} (organic/inorganic hybrid material) in different pH solutions (1, 7, 13) has been done. Washing tests were also done in views of its possible application in electronic textiles such as antistatic clothing. X-ray photoelectron spectroscopy (XPS) studies have been done to quantify the amount of counter ion that remains in the polymer matrix and determine the doping ratio (N{sup +}/N) after the different tests. Scanning electron microscopy (SEM) was also used to observe morphological differences after the different tests. Surface resistivity changes were measured by means of electrochemical impedance spectroscopy (EIS). Scanning electrochemical microscopy (SECM) was employed to measure changes in electroactivity after the different tests. Higher pHs caused a decrease of the doping ratio (N{sup +}/N), the loss of part of the counter ions and the decrease of its conducting and electrocatalytic properties. The stability in acid media and neutral media and after the washing test was good. Only at pH 13 the loss of the counter ion was widespread and there was a decrease of its conducting and catalytic properties; although the fabrics continued acting mainly as a conducting material.

  1. Dyeing and fire proofing of polyester fabric in one bath%涤纶阻燃染色同浴加工技术

    Institute of Scientific and Technical Information of China (English)

    程小霞; 龙邵; 陈海波; 吴静玲

    2013-01-01

    介绍涤纶阻燃剂TF-6142与分散染料染色的同浴整理工艺,探讨阻燃剂TF-6142用量对阻燃效果、染色色光和深度、色牢度、强力和耐洗性的影响.结果表明,阻燃剂TF-6142与分散染料染色同浴处理涤纶织物,可获得良好的阻燃效果和色牢度,染深色时也不影响织物的染色深度;洗涤50次后,阻燃效果基本不变,且对织物强力略有提升.%One-bath flame-retardant finishing and disperse dyeing of polyester fabric with flame retardant agent TF-6142 is carried out. The effects of flame retardant agent TF-6142 concentration on the flame retardancy, the dyeing shade and depth, color fastness, breaking and tearing strength and washing durability are discussed. The results show that the finished fabric features excellent flame-retardant property and high color fastness, and the color depth is stable even in deep shade. After fifty home launderings, the flame retardancy keeps the same, and its strength even has a slight increase.

  2. Influence of activation methods on waste cotton-polyester fabric recycling%活化方法对废旧涤/棉混纺织物回收利用的影响

    Institute of Scientific and Technical Information of China (English)

    燕敬雪; 张瑞云

    2012-01-01

    In order to better recover cotton component from the waste cotton-polyester blended fabrics, four different activation methods, including sodium hydroxide, sodium hydroxide and ultrasonic treatment, ethylenediaraine, and ethylenediamine and ultrasonic treatment, were adopted to activate the blended fabrics to obtain proper methods on the principle of minimizing the impact on polyester and maximizing the solubility of cotton cellulose. The influence of four different activation methods on polyesler mass, mechanical properties and chemical structures of waste cotton-polyester blended fabrics was investigated, and the results revealed that the sodium hydroxide and sodium hydroxide and ultrasonic treatment have less effect on polyester, and can be used to activate the waste cotton-polyester blended fabrics. The further study result of the influence of the two methods above on molecular structure and solubility of cotton fibers showed that sodium hydroxide and ultrasonic treatment is the best suitable way to activate the waste cotton-polyester blended fabrics.%为更好地溶解废旧涤/棉混纺织物中的棉纤维,采用4种活化方法对废旧涤/棉混纺织物进行活化,并在4种活化方法中寻找最适合的活化方法,其原则是应尽量减少对涤纶各方面的影响和增加棉纤维素的溶解度.通过比较4种活化方法对废旧涤/棉混纺织物中涤纶的质量、拉伸性能、化学结构的影响,发现氢氧化钠和氢氧化钠+超声波处理方法对涤纶各方面的影响较小,可用于活化废旧涤/棉混纺织物.进一步探讨这2种活化方法对棉纤维素结构和溶解性的影响发现,氢氧化钠+超声波活化方法最适合用来活化废旧涤/棉混纺织物.

  3. 阳离子可染涤纶/羊毛/天丝混纺织物染色%Dyeing process of cationic dyeable polyester/wool/Tencel blended fabric

    Institute of Scientific and Technical Information of China (English)

    唐家瑞

    2013-01-01

    Batchwase dip dyeing of cationic modified polyester/wool/Tencel blended fabric is carried out in high temperature high pressure overflow dyeing machine. First step is dyeing at 120 ℃ for 40 min with cationic and neutral dyes in one bath, the second step is dyeing at 60 ℃ for 50 min with reactive dyes. The dyeings can reach or exceed the requirements of first-class products, and the process features energy saving and emission reduction.%采用高温高压溢流染色机,对阳离子改性涤纶/羊毛/天丝混纺织物染色.第一浴,120℃阳离子染料和中性染料同浴染色40 min;第二浴,60℃活性染料染色50 min.该染色产品达到或优于一等品要求,且具缩短流程和节能降耗的特点.

  4. Fabrication of glucose biosensor for whole blood based on Au/hyperbranched polyester nanoparticles multilayers by antibiofouling and self-assembly technique

    Energy Technology Data Exchange (ETDEWEB)

    Sun, Chong [Jiangsu Key Laboratory of Biofunctional Materials, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023 (China); Key Laboratory for Soft Chemistry and Functional Materials of Ministry of Education, School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094 (China); Chen, Xiaohan; Han, Qiaorong [Jiangsu Key Laboratory of Biofunctional Materials, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023 (China); Zhou, Min [Department of Vascular Surgery, the Affiliated Drum Tower Hospital of Nanjing University Medical School, Nanjing 210008 (China); Mao, Chun, E-mail: maochun127@yahoo.cn [Jiangsu Key Laboratory of Biofunctional Materials, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023 (China); Zhu, Qinshu [Jiangsu Key Laboratory of Biofunctional Materials, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023 (China); Shen, Jian, E-mail: jshen@njnu.edu.cn [Jiangsu Key Laboratory of Biofunctional Materials, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023 (China)

    2013-05-07

    Highlight: •A novel method for detection of glucose in whole blood has been developed. •The method based on antibiofouling and self-assembly technology was investigated. •The antibiofouling technique utilized for sensor is significant for diagnostics. -- Abstract: Acknowledging the benefits of hyperbranched polymers and their nanoparticles, herein we report the design and synthesis of sulfonic acid group functionalized hydroxyl-terminated hyperbranched polyester (H30-SO{sub 3}H) nanoparticles and their biomedical application. The H30-SO{sub 3}H nanoparticles were characterized by transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectroscopy and proton nuclear magnetic resonance spectroscopy ({sup 1}H NMR). The good hemocompatibility of H30-SO{sub 3}H nanoparticles was also investigated by coagulation tests, complement activation and platelet activation. The novel glucose biosensor was fabricated by immobilizing the positively charged Au nanoparticles, H30-SO{sub 3}H nanoparticles and glucose oxidase (GOx) onto the surface of glassy carbon electrode (GCE). It can be applied in whole blood directly, which was based on the good hemocompatibility and antibiofouling property of H30-SO{sub 3}H nanoparticles. The biosensor had good electrocatalytic activity toward glucose with a wide linear range (0.2–20 mM), a low detection limit 1.2 × 10{sup −5} M in whole blood and good anti-interference property. The development of materials science will offer a novel platform for application to substance detection in whole blood.

  5. Polarisation-sensitive optical elements in azobenzene polyesters and peptides

    DEFF Research Database (Denmark)

    Ramanujam, P.S.; Dam-Hansen, Carsten; Berg, Rolf Henrik;

    2006-01-01

    In this article, we describe fabrication of polarisation holographic optical elements in azobenzene polyesters. Both liquid crystalline and amorphous side-chain polyesters have been utilised. Diffractive optical elements such as lenses and gratings that are sensitive to the polarisation...... of the incident light have been fabricated with polarisation holography. Computer-generated optical elements and patterns have also been written with a single polarised laser beam. Recording of polarisation defects enabling easy visualisation is also shown to be feasible in azobenzene polyesters....

  6. 涤纶织物的环保型抗菌阻燃多功能整理%Antibacterial and flame retardant finish of polyester fabric

    Institute of Scientific and Technical Information of China (English)

    逢春华

    2013-01-01

    With antibacterial finishing agent SCJ-891 and flame retardant agent JLSUN (R) ATP,the antibacterial and flame retardant multi-functional finish of polyester fabric in one bath is carried out.The influences of the dosage of flame retardant agent and antibacterial finishing agent,temperature and time of drying and curing on finishing results are researched.The optimal finishing process is flame retardant agent JLSUN (R) ATP 170 g/L,antibacterial agent SCJ-891 40 g/L,drying at 100 ℃ for 1 ~2 min,curing at 190 ℃ for 2 min.The antibacterial and flame retardant properties of the finished fabric can meet the requirements of national standard,and the wearability and durablility to repeated launderings are good.%选用抗菌整理剂SCJ-891、阻燃整理剂JLSUN(R)ATP对涤纶织物进行一浴法抗菌阻燃多功能整理,研究了阻燃剂和抗菌整理剂用量、预烘温度和时间、焙烘温度和时间等工艺参数对抗菌阻燃效果的影响.优化的抗菌阻燃整理工艺为:JLSUN(R)ATP 170 g/L,抗菌整理剂SCJ-891 40 g/L;100℃预烘1~2 min,190℃焙烘2 min.整理织物的抗菌性能和阻燃效果达到国家标准的要求,耐洗涤性和服用性良好.

  7. Fatigue damage assessment of uni-directional non-crimp fabric reinforced polyester composite using X-ray computed tomography

    DEFF Research Database (Denmark)

    Jespersen, Kristine Munk; Zangenberg Hansen, Jens; Lowe, Tristan

    2016-01-01

    In this study, the progression of tension-tension fatigue (R=0.1) damage in a unidirectional (UD) composite made from a non-crimp glass fibre fabric used for wind turbine blades is investigated using multi-scale 3D X-ray computed tomography (CT). Initially, a representative volume is examined...

  8. A Facile Synthesis of Arylazonicotinates for Dyeing Polyester Fabrics under Microwave Irradiation and Their Biological Activity Profiles

    Directory of Open Access Journals (Sweden)

    Saleh M. Al-Mousawi

    2012-09-01

    Full Text Available A as textile dyes and the fastness properties of the dyed samples were measured. Most of the dyed fabrics tested displayed very good washing and perspiration fastness and series of 2-hydroxy- and 2-amino-6-substituted-5-arylazonicotinate monoazo compounds 7a–e and 9a–c were prepared via condensation of 3-oxo-3-substituted-2-arylhydrazonals 2a–e with active methylene nitriles 3a–d using microwave irradiation as an energy source. These substances were then tested moderate light fastness. Finally, the biological activity of the synthesized compounds against Gram positive bacteria, Gram negative bacteria and yeast were evaluated.

  9. A facile synthesis of arylazonicotinates for dyeing polyester fabrics under microwave irradiation and their biological activity profiles.

    Science.gov (United States)

    Al-Mousawi, Saleh M; El-Apasery, Morsy A; Mahmoud, Huda M

    2012-09-27

    A as textile dyes and the fastness properties of the dyed samples were measured. Most of the dyed fabrics tested displayed very good washing and perspiration fastness and series of 2-hydroxy- and 2-amino-6-substituted-5-arylazonicotinate monoazo compounds 7a-e and 9a-c were prepared via condensation of 3-oxo-3-substituted-2-arylhydrazonals 2a-e with active methylene nitriles 3a-d using microwave irradiation as an energy source. These substances were then tested moderate light fastness. Finally, the biological activity of the synthesized compounds against gram positive bacteria, gram negative bacteria and yeast were evaluated.

  10. One-Pot Synthesis of Disperse Dyes Under Microwave Irradiation: Dyebath Reuse in Dyeing of Polyester Fabrics

    Directory of Open Access Journals (Sweden)

    Huda M. Mahmoud

    2012-04-01

    Full Text Available A series of 4-hydroxyphenylazopyrazolopyrimidine disperse dyes were prepared via one-pot reactions of p-hydroxyphenylhydrazone, hydrazine hydrate, and acetylacetone or enaminones using microwave irradiation as an energy source. Structural assignments of the dyes were confirmed by X-ray crystallographic structure determination. Instead of discharging the dyebath after each dyeing cycle, the residual dyebath was spectrophotometrically analyzed and then pH readjusted for a repeat dyeing with longer time. Fastness of the dyed samples was measured after each recycle. Most of the dyed fabrics tested displayed good light fastness and excellent fastness to washing and perspiration. Finally, the biological activity of the synthesized dyes against Gram positive bacteria, Gram negative bacteria and yeast were evaluated.

  11. One-pot synthesis of disperse dyes under microwave irradiation: dyebath reuse in dyeing of polyester fabrics.

    Science.gov (United States)

    Al-Etaibi, Alya M; El-Apasery, Morsy A; Mahmoud, Huda M; Al-Awadi, Nouria A

    2012-04-10

    A series of 4-hydroxyphenylazopyrazolopyrimidine disperse dyes were prepared via one-pot reactions of p-hydroxyphenylhydrazone, hydrazine hydrate, and acetylacetone or enaminones using microwave irradiation as an energy source. Structural assignments of the dyes were confirmed by X-ray crystallographic structure determination. Instead of discharging the dyebath after each dyeing cycle, the residual dyebath was spectrophotometrically analyzed and then pH readjusted for a repeat dyeing with longer time. Fastness of the dyed samples was measured after each recycle. Most of the dyed fabrics tested displayed good light fastness and excellent fastness to washing and perspiration. Finally, the biological activity of the synthesized dyes against Gram positive bacteria, Gram negative bacteria and yeast were evaluated.

  12. 双三羟甲基丙烷磷酸酯盐抗静电剂在涤纶织物上的应用研究%Application Properties of the Di-trimethylolpropane Phosphate Salt Antistatic Agent on Polyester Fiber Fabrics

    Institute of Scientific and Technical Information of China (English)

    李祥; 丁斌; 凤岭; 关昶; 王海东; 刘群

    2012-01-01

    采用双三羟甲基丙烷磷酸酯盐抗静电剂对涤纶织物进行整理,探讨了抗静电剂浓度、焙烘温度、焙烘时间以及涤纶织物耐洗次数对涤纶织物抗静电性能效果的影响,结果表明:抗静电剂浓度为20g/L、焙烘温度为170℃、焙烘时间为80s时,抗静电整理效果较好;同时整理后的涤纶织物经50次洗涤后抗静电性能仍保持良好.%Polyester fiber fabrics were finished with Di-trimethylolpropane phosphate salt a-ntistatic agent. The effects of reaction conditions, such as the antistatic agent concentration, baking temperature, baking time and polyester fabric wash times of polyester fabric antist-atic finishing conditions were as follows:antistatic agent 20 g/L finished polyester fiber fabrics has good antistatic properties. antistatic performance remains good. performance effect are discussed. The optimum ,baking temperature 170 ~C ,baking time 80. The After finishing of polyester fabric 50 times washing

  13. N,O-羧甲基壳聚糖在导电涤纶织物化学镀中的应用%Application of N,O-carboxymethyl chitosan in conductive polyester fabrics with electroless plating treatment

    Institute of Scientific and Technical Information of China (English)

    吴建文; 俞丹; 王炜

    2011-01-01

    对壳聚糖引入羧基制备改性N,O-羧甲基壳聚糖(NOCC),因其有良好的水溶性,可采用浸轧法处理在涤纶织物上,利用其在活化过程中吸附贵金属钯引发之后的化学镀,获得致密、均匀的金属镀层,赋予织物导电性和电磁屏蔽效能.采用红外图谱(FT-IR)和1℃核磁共振谱图对NOCC进行表征,并用SEM图观察了经NOCC处理后和化学镀后导电涤纶织物的纤维表面形貌.%Chitosan was modified with carboxyl to produce N,O-carboxymethyl chitosan (NOCC). Due to good water solubility, NOCC was treated on the polyester (PET) fabrics through padding method, which adsorbed precious palladium metal in the activation process and catalyzed the electroless plating process. Accordingly, compact and even metal plating was obtained, which endowed the fabric with electrical conductivity and electromagnetic shielding property. The structure of NOCC was characterized by FT-IR and 13C-NMR. The morphology of electrical conductive polyester fabric treated by NOCC and electroless plating was observed by SEM.

  14. A Study on the Thermal Comfort of Polyester/Cotton/Hemp Blended Fabric%涤纶/长绒棉/汉麻织物的热舒适性研究

    Institute of Scientific and Technical Information of China (English)

    张红梅; 孙润军

    2015-01-01

    Eight kinds of light-weight polyester/cotton/hemp blended fabric with different blending ratio and with yarns spun by different spinning methods were selected for investigating their thermal comfort. By using US-made humidity chamber and Sweating Guarded Hotplate, the thermal conductive property of the fabric was simulated under 11 designed temperature and humidity conditions. The objective of this study is to find the influence of blending ratio and spinning methods on the thermal comfort of multi-fiber blended fabric and the thermal comfort conditions of polyester/cotton/hemp blended fabric. The results indicate that among four major factors including temperature, humidity, blending ratio and spinning method, blending ratio has little effect on fabric thermal resistance, while spinning method is the most influential factor; whatever the condition is, the fabric made from sirofil-spun yarn is better than that made from siro-spun yarn in term of thermal transmission and the former is cooler than the latter; under the condition of temperature above 20 ºC and relative humidity below 60%, the thermal resistance of the fabric is low and stable, which contribute to the fabric comfort.%选用8种不同混纺比、不同纺纱方式的涤棉麻混纺薄型织物,对其热舒适性进行研究。采用美国西北公司的热阻湿阻仪,利用恒温恒湿箱控制,设计了11种温湿度条件,模拟织物在不同穿着环境下的热传导性能。目的是为了得到不同混纺比和不同纺纱方式织物的热阻值差异以及涤棉麻混纺织物的热舒适使用条件。结果表明,外界温湿度、原料混纺比及纺纱方式4个因素中,混纺比对织物热阻影响较小,而纺纱方式的影响最大;不论在怎样环境下,赛络菲尔纺织物总是比赛络纺织物热阻小,表现更凉爽;温度高于20℃,相对湿度低于70%环境下,涤棉麻混纺织物热阻值小且稳定,使用舒适。

  15. Synthesis and characterization of oleophobic fluorinated polyester films

    Science.gov (United States)

    Demir, Tugba

    The study presented in this dissertation is dedicated to the synthesis and characterization of oleophobic fluorinated polyester films. Specifically, the blending of oleophilic polyethylene terephthalate (PET) with low surface energy materials such as fluorinated polyesters has been used in order to fabricate oleophobic PET films. First, fluorinated polyesters (P(PF-oate-R)) possessing different end-groups (-COOH, -OH and -CF3) are synthesized via polycondensation reaction of isophthaloyl chloride with perfluoro ether alcohols. Then, they are solvent-blended with PET at various concentrations to obtain oleophobic polyester films of different compositions. In addition, the films are annealed to investigate the effect of annealing on surface properties of the films. The results show that the obtained PET/P(PF-oate-R) polyester films demonstrate low wettability that depended on the polyester end-groups, film compositions, and annealing. It is found that PET blended with fluorinated polyesters terminated with CF3 groups exhibit higher contact angle (CA) with water and oils than other polyesters. In addition, CA increases with increasing P(PF-oate-R) polyester content in blends. To facilitate the oleophobicity of PET films, the fluorinated polyesters terminated with -CF3 groups with two different Mw were synthesized and blended with PET. The results reveal that at low concentrations, low molecular weight polyesters migrate to the surface easily, resulting in higher surface coverage. Thus, it leads to higher water and oil repellency. On the other hand, when they are used at high concentrations, higher molecular weight polyesters in blends reduce the wettability of the surface to the higher level. It is found that the wettability of the PET film surface depends on not only the Mw of polyesters, but also on annealing protocol. To this end, the effects of the annealing temperature on surface wettability are also examined.

  16. Application of Polyester Imitated Cotton Fabric on Home Textiles%涤纶仿棉织物在家纺产品中的应用探讨

    Institute of Scientific and Technical Information of China (English)

    顾浩; 杨文龙; 方娟娟

    2015-01-01

    The definition of polyester imitated cotton product was introduced, and the essential differences be-tween polyester imitated cotton product and other imitated cotton products were pointed out. Taking home textile as an example, the production processes about presetting, dyeing, post-treatment and printing were studied, and the physical properties of polyester imitated cotton product were tested. The results show that polyester imitated cotton product has the properties of soft and fluffy handle, soft luster, absorption and fast dry, good color fastness and so on, which is suitable for slap-up home textile and garment.%介绍了涤纶仿棉产品的定义,指出了与以往仿棉产品的本质区别,并从涤纶仿棉的方法、涤纶仿棉纤维的性能等方面进一步阐述了涤纶仿棉产品。以家纺产品为例,从预定形、染色、后整理、印花等方面进行了生产工艺的研究,并对涤纶仿棉产品进行物理性能测试。结果表明,涤纶仿棉产品具有手感软糯蓬松、光泽柔和、吸湿快干、色牢度好等特性,特别适用于高档家纺、服装等面料。

  17. 废旧聚酯纺织品的再生扩链改性研究%Chain extension modification of recycled post-consumer polyester fabric

    Institute of Scientific and Technical Information of China (English)

    秦丹; 王朝生; 王伟; 王华平

    2016-01-01

    Post-consumer polyester ( Post-PET ) fabric was exposed to chain extension modification with pyromellitic dian-hydride ( PMDA) as a chain extender and to reactive extrusion in different proportion from a Hakke torque rheometer to produce chain extension modified PET ( R-PET) with different PMDA content .The reactive extrusion process conditions and the proper-ties of R-PET were studied.The results showed that R-PET could be produced with the intrinsic viscosity of 0.784 dL/g and the carboxyl end group content 67.1 mol/t as the process conditions were optimized as followed:0.9%PMDA based on Post-PET by mass fraction, reaction temperature 280 ℃, reaction time 300 s, rotation speed 40 r/min;double melting peaks appeared in the differential scanning calorimetric curve of R-PET, and the thermal stability of R-PET did not obviously drop as compared with Post-PET;R-PET exhibited the obvious shear thinning phenomenon and higher complex viscosity , storage modulus and loss mod-ulus than Post-PET, and possessed the melt elasticity satisfying the processing requirements .%以均苯四甲酸二酐( PMDA)为扩链剂,对废旧聚酯纺织品( Post-PET)进行扩链改性,将 PMDA 与Post-PET按不同配比在Hakke转矩流变仪中进行反应挤出,制备了不同 PMDA 含量的扩链改性 PET ( R-PET),研究了反应挤出工艺条件及R-PET的性能。结果表明:反应挤出最佳工艺条件为 PMDA (相对 Post-PET)质量分数0.9%,反应温度280℃,反应时间300 s,转速40 r/min,在此条件下制得的R-PET的特性黏数为0.784 dL/g,端羧基含量为67.1 mol/t;与Post-PET比较,R-PET 的差示扫描量热曲线中出现了熔融双峰,热失重曲线表明R-PET的热稳定性能没有明显降低;动态流变性能表明,R-PET具有明显的剪切变稀现象,其复数黏度、储能模量、损耗模量均高于Post-PET,满足了R-PET加工对于熔体粘弹性的要求。

  18. 涤纶包覆纱纬弹色织面料的生产技术要点%Technology Key Points of Producing Polyester Covered Weft Elastic Yarn-dyed Fabric

    Institute of Scientific and Technical Information of China (English)

    马顺彬; 蔡永东; 葛龙德

    2011-01-01

    介绍涤纶包覆纱纬弹色织面料的设计及生产要点,通过设计每花经纱根数和全幅花数、合理设计布边组织及每筘穿入数、合理调节主辅喷嘴引纬气压、适当增加上机张力、合理调节开口时间等技术措施,使织造过程中布幅稳定,布面均匀,无纬缩,织物有弹性,织机效率达95%以上,入库一等品率在97%以上.%Design and production key points of polyester covered weft elastic yarn-dyed fabric were introduced.Each flower warp number and whole flower number was designed. Selvage structure and warp numbers per reed were designed rationally. Weft-inserting pressure of main and auxiliary nozzle were adjusted rationally. Loom tension was increased properly. Shed timing was set rationally. Finally fabric width is stable in production,fabric surface is even, no kinky weft,fabric is elastic,loom efficiency could reach above 95% and first class-product rate could reach above 97%.

  19. Performance of composite reverse osmosis membranes fabricated with polyester mesh as support%非无纺布支撑反渗透复合膜的制备及其性能研究

    Institute of Scientific and Technical Information of China (English)

    黄燕; 王铎

    2011-01-01

    经过40多年的发展,反渗透技术成为膜法水处理中发展最为成熟、应用最为广泛的一种,但高性能反渗透膜的研制仍是目前研究的热点之一。借鉴正渗透膜的制备方法,以聚酯筛网为支撑材料制备了非无纺布支撑的反渗透复合膜,研究了不同制备条件对膜性能的影响,并采用扫描电子显微镜对所制备复合膜的表面和断面进行了表征。结果表明,以聚酯筛网为支撑材料,聚砜为底膜聚合物,N,N-二甲基乙酰胺为溶剂,PEG-400为添加剂时,制备的复合膜最佳水通量在38.5L/(m2.h),NaCl截留率达到99%,明显优于以无纺布为支撑材料的反渗透%With its development in the past four decades,reverse osmosis(RO) technology,one of the key focuses of the membrane water treatment technology,has now been well-developed and widely used,among which the fabrication of high performance RO membranes is playing an especially significant role.In this paper,a novel kind of reverse osmosis membrane was fabricated with polyester mesh which was usually used in forward osmosis membrane as the support material to replace the traditional non-woven fabric.Membranes under series of different factors were fabricated and their performances including water flux and solute rejection,were studied respectively.The surface and cross-section morphologies of the membrane were observed by SEM.The results demonstrated that the performance of the fabricated membranes achieved a high water flux of 38.5L/(m2·h) and NaCl rejection reached to 99%,which was better than that of the traditional non-woven fabric supported RO membrane.Furthermore,the water flux and solute rejection of the composite membrane didn't decrease during the 3h operation,which suggests that the polyester mesh-supported composite RO membranes have excellent compression resistance and superior antifouling property.

  20. 涤/锦/棉/氨纶多组分纤维功能性面料染整工艺探讨%Dyeing and finishing process of polyester/ polyamide/ cotton/ spandex multi-component fibers functional fabric

    Institute of Scientific and Technical Information of China (English)

    周勇; 李春光; 吕建品; 徐惠娟; 王海花

    2015-01-01

    The enzyme cold-batch and low temperature pretreatment were used to solve the wrinkling problem of polyester/polyamide/cotton/spandex multi-component fibers fabric. The potential damage of hole on the fabric caused by low temperature oxygen bleaching was also solved. And the fluffy and soft-feeling semi-finished product was obtained. Disperse dyes with high washing fastness were selected to solve the high washing fastness of multi-component fibers fabric. The continuous pad dyeing process with acid dyes was developed and the uniform dyeing quality was obtained by adjusting three kinds of fiber hue. The functional composite finishing of fabric was carried out to increase the hydrophilic soil-release finishing on the base of outstanding fabric smoothness. The wearing comfort and washable fabric performances were achieved, improving wearability of the fabric.%采用生物酶冷堆及低温前处理工艺解决涤棉锦氨纶多纤维织物的褶皱问题,同时解决了低温氧漂中潜在破洞的损伤,半成品手感柔软、蓬松;染色工序优选高水洗牢度分散染料,解决多纤维织物的高水洗色牢度,开发酸性染料的长车轧染工艺,通过3种纤维色相调整,获得均匀、饱满的染色实物质量;在获得优良的织物外观平整度的基础上,对面料功能性复合整理,增加亲水易去污整理,使面料穿着舒适、历久常新,提高了织物的服用性能.

  1. 聚苯胺与聚苯胺涤纶复合导电织物的制备%Preparation of Polyaniline and Polyaniline/Polyester Compound Conductive Fabric

    Institute of Scientific and Technical Information of China (English)

    张保宏; 薛涛; 孟家光

    2013-01-01

    Using sulfuric acid as mixed acid and ammonium persulfate as oxidant, polyaniline is prepared by the chemical oxidation synthesis, and polyaniline/polyester compound conductive fabric is prepared by in-situ poly-merization synthesis. The electric conductivity effect of the molar ratio of ammonium persulfate and aniline and the density of sulfuric acid for polyaniline and polyaniline/polyester compound conductive fabric are analyzed, mean-while, the surface profile of polyaniline is tested, and then the mechanical property and durability of polyaniline/polyester compound conductive fabric are tested. The results show that the optimum preparation conditions of polyaniline is: the molar ratio of ammonium persulfate and aniline is 1∶1, and the concentration of sulfuric acid is 1 mol/L under reaction temperature 15~25 ℃ for 6 hours. The optimum preparation conditions of polyaniline/polyester compound conductive fabric is: the molar ratio of ammonium persulfate and aniline is 1∶1, the concentra-tion of sulfuric acid is 1 mol/L under reaction temperature 15~25℃ for 2 hours.%以H2SO4为掺杂酸,过硫酸铵为氧化剂,采用化学氧化聚合法制备聚苯胺,用扫描电镜和数字万用表对其形态和导电性能进行测试;以H2SO4为掺杂酸,过硫酸铵为氧化剂,采用原位聚合法制备聚苯胺涤纶复合导电织物,对聚苯胺涤纶复合导电织物的导电性能、力学性能及耐洗性进行测试。结果表明,制备聚苯胺的最佳工艺条件为:过硫酸铵与苯胺单体摩尔比为1∶1,硫酸浓度为1 mol/L,反应时间为6 h,反应温度为15~25℃;制备聚苯胺涤纶复合导电织物的最佳工艺条件为:过硫酸铵与苯胺单体摩尔比为1∶1,硫酸浓度为1 mol/L,反应时间为2 h,反应温度为15~25℃。

  2. Synthesis, biological activity and dyeing performance of some novel azo disperse dyes incorporating pyrazolo[1,5-a]pyrimidines for dyeing of polyester fabrics

    Science.gov (United States)

    Sayed, Ahmed Z.; Aboul-Fetouh, Mahmoud S.; Nassar, Hesham S.

    2012-02-01

    Several novel pyrazolopyrimidine azo compounds were achieved from diazotization of 4-aminoacetanilide and coupling with malononitrile and then refluxed with hydrazine hydrate to furnish 3,5-diamino-4-(4-acetamidophenylazo)-1H-pyrazole. The later compound was diazotized and coupled with substituted α-cyanocinnamate, α-cyanocinnamonitrile, 2-cyano-3-ethoxyacrylic acid ethyl ester, chalcones and ethylacetoacetate to produce novel dyestuffs. Structures of the dyes were fully characterized by using FT-IR, 1H NMR, mass spectroscopy and elemental analysis. The dyes were applied to polyester fiber, affording satisfactory results and showed biological activity towards various microorganisms.

  3. 涤纶针织物吸汗速干整理实践及常见问题分析%Practice of Sweat Absorption and Flash Drying Finishing of Polyester Knitted Fabric and Analysis of Common Problems

    Institute of Scientific and Technical Information of China (English)

    陈庭春; 董涛涛; 李娟; 冯燕平

    2015-01-01

    The principle of sweat absorption and flash drying finishing was expounded, and polyester knitted fabrics were finished by three methods of dyeing in one bath, dipping after dyeing and padding after dyeing with sweat absorption and flash drying finishing agent PR-868EZ. The water absorption, wet permeability and flash dry-ing property and the effects on color shade and color fastness of polyester knitted fabric after different methods were tested and analyzed. The problems of sweat absorption and flash drying finishing in production were analyzed in de-tail. The results show that the water absorption, wet permeability and flash drying property of fabric after finishing by the three methods are improved obviously, but the flash drying property of fabric finished by dipping after dye-ing and padding after dyeing can not satisfy requirement when after 10 times washing; the three methods have little effects on color shade; dyeing in one bath can satisfy the color fastness requirement of common garment, dipping after dyeing and padding after dyeing have great influence on color fastness.%阐述了吸汗速干整理的原理,并选用吸汗速干整理剂PR-868EZ,通过染色同浴、染后浸渍及染后浸轧3种方法对涤纶针织面料进行整理加工. 测试并比较了不同方法整理后涤纶针织面料的吸水性、导湿性、速干性,以及对色光、色牢度的影响.详细分析了生产中常见的吸汗速干整理问题.结果表明,3种方法整理后,面料的吸水性、导湿性及速干性均能得到显著地改善,但染后浸渍及染后浸轧处理的面料,超过10次水洗,其速干性无法满足要求;3种处理方法对面料的色光影响都较小;染色同浴整理可满足常规服装色牢度要求,染后浸渍及染后浸轧整理对面料色牢度的影响较大.

  4. Moisture Absorption and Sweat Releasing Finishing of Polylactic Acid Fiber and Polyester Fiber Blended Knitted Fabric%聚乳酸纤维与涤纶混纺织物的吸湿排汗整理

    Institute of Scientific and Technical Information of China (English)

    张海芳; 郑伟; 高普; 高小华

    2015-01-01

    聚乳酸纤维(PLA纤维)具有良好的导湿性,与涤纶纤维混纺后能提升织物的导湿性能.但由于PLA纤维和涤纶同属于疏水性纤维, 织物的吸湿排汗性能仍不能满足穿着舒适性要求. 文中采用新型HPX吸湿排汗剂对PLA纤维与涤纶混纺针织物进行吸湿排汗整理,探讨了浸轧工艺、染色同浴浸渍工艺以及单纯浸渍工艺对织物吸湿排汗性能的影响.结果表明,经过HPX吸湿排汗剂整理后,织物的吸湿排汗性能显著提升;HPX吸湿排汗剂浸轧整理最佳工艺为:HPX吸湿排汗剂用量为40~50 g/L,焙烘温度为130℃,焙烘时间为25 s;染色同浴浸渍整理和单纯浸渍整理都有显著的整理效果,单纯浸渍法效果更优;染色同浴整理时,吸湿排汗性能的耐洗性良好,耐摩擦色牢度较好,但得色量有所下降.%Polylactic acid fiber(PLA) has good wet permeability, and can improve wet permeability of fabric af-ter blending with polyester fiber. However PLA and polyester belong to hydrophobic fiber, hygroscopic and sweat releasing property of the fabric still can not content the requirements of comfort. In this paper, PLA and polyester blended fabric was treated by a new type HPX hygroscopic and sweat releasing agent, and the effects of padding process, dyeing in one bath process and simple dipping process on hygroscopic and sweat releasing property of the fabric were discussed. The results show that hygroscopic and sweat releasing property of the fabric significantly in-creases after finishing by hygroscopic and sweat releasing agent; the optimal process is that the dosage of HPX hy-groscopic and sweat releasing agent is 40~50 g/L, baking temperature and time are 130 ℃ and 25 seconds; dyeing in one bath finishing and simple dipping dyeing finishing all have remarkable effects, the effects of simple dipping process are better; washing durability of hygroscopic and sweat releasing property after finishing by dyeing in one bath process

  5. 聚丙烯酸酯整理剂处理涤纶织物的耐酸碱性%Acid and Alkali Resistance of Polyester Fabric Finishing by Po]yacryhate Resin

    Institute of Scientific and Technical Information of China (English)

    董晓敏; 王进美; 支超

    2011-01-01

    The polyester fabric was treated with polyacrylate resin and nano water and oil repellent agents for acid and alkali resistance. The fabric was treated by 60 % resin of total fabric weight and 8 % nano finishing agent with conditions of drying temperature 80 ℃, baking temperature 160 ℃, baking time 3 min. After examination with national standard test method, the anti-through time for acid and alkali was achieved both 3 min before and after washing. The fabric was soft and breathable after finishing, which maintained the original wearability and good washing performance.%采用聚丙烯酸酯树脂涂层结合纳米拒水拒油剂的复合整理工艺路线,对涤纶织物进行耐酸和耐碱整理.使用占布质量60%的树脂和8%的纳米整理剂分两步处理织物,烘干温度为80℃,烘焙温度为160℃,烘焙时间3 min,按国家标准测试方法测试,经处理的涤纶织物在洗前和洗后,耐酸碱透过时间均可达到3 min及以上.经处理织物手感柔软,透气性良好,能较好保持原有的服用性能,同时具有良好的耐水洗性能.

  6. 涤棉混纺织物分散红玉/活性红轧染工艺的探讨%Discussion on polyester-cotton blend fabric pad dyeing with disperse red/reactive red dyes

    Institute of Scientific and Technical Information of China (English)

    曹颖; 戴桦根

    2013-01-01

    The pad dyeing of polyester-cotton blend fabric was discussed according to the influences of curing temperature, curing time, electrolyte consumption, soda ash and steaming time on the fabric weight and soaping fastness. The optimum process was as follows: curing temperature 200 ℃, curing time 100 s, Na2CO3 30 g/L, NaCI 200 g/L. The pad dyeing effect of under this process was good and the washing fastness was over 4 grade, the levelness △E was 1.0.%通过探讨焙烘温度、焙烘时间、电解质用量、纯碱用量、汽蒸时间对织物单位面积质量和皂洗牢度的影响,优化涤棉轧染工艺.最佳工艺为:焙烘温度200℃,焙烘时间100s,Na2CO3用量30 g/L,NaCl用量200 g/L.此工艺条件下,染料的上染效果较好,皂洗牢度在4级以上;匀染性较好,△E为1.0.

  7. Resist printing of polyester/acetate fabric with disperse dyestuffs%涤纶/醋酯面料的分散防印印花

    Institute of Scientific and Technical Information of China (English)

    刘仲娟; 赵涛

    2011-01-01

    Owing to poor dyeing depth and sharpness of supermicro polyester/profiled acetate fiber blends, resist printing process with disperse dyes which have the similar dyeing behaviors is carried out. Factors influencing printing effects are analyzed, such as dyes, thickeners, resisting agents, as well as soaping agents, matters needing attention are put forward. The prints have good sharpness and definition, which can meet the requirements of the customers.%针对新型涤纶超细纤维/醋酯异形纤维面料深染性较差,印制边缘轮廓不够清晰的问题,采用对涤纶和醋酸纤维具有相同上染性能的分散染料,开发出分散防染分散印花工艺.文中分析了印花工艺处方中染料、糊料、防染剂和皂洗剂的优选条件;提出了工艺操作的注意事项.结果表明,该工艺印制的花型精细度高、轮廓清晰,满足客户的要求.

  8. 拒水拒油剂FG-410对涤纶织物整理工艺探讨%Discussion on finishing technology of water-repellent and oil-repellent finishing agent FG-410 on polyester fabrics

    Institute of Scientific and Technical Information of China (English)

    王健; 江里友

    2011-01-01

    采用国产含氟拒水拒油整理剂FG-410,通过正交试验探讨了整理剂用量、交联剂用量、催化剂用量及焙烘温度等因素对拒水拒油整理效果的影响,优化工艺条件为:FG-410整理剂用量20g/L,FBA交联剂用量16g/L,催化剂MgCl2用量8g/L,155℃焙烘.整理后织物具有良好的拒水拒油性能及耐水洗性,且整理工艺对织物强力及透气性无明显影响.%Polyester fabrics were finished with homemade water-repellent and oil-repellent agent fluorinecontained FG-410.Through orthogonal test, the effects of the dosage of water-repellent and oil-repellent agent,the dosage of crosslinking agent and catalyst, and cure temperature on the properties of water-repellence and oil-repellence were investigated.The optimum technology conditions were as follows: 20 g/L of finishing agent FG-410, 16 g/L of crosslinking agent FBA, 8 g/L of catalyst MgC12, cured at 155 ℃.The finished fabric showed superior water-repellent and oil-repellent properties and durable laundries.And the finishing had unobvious change on the broken strength and the air permeability of the fabrics.

  9. Investigation on Water Jet Treated Polyester/cotton Blended Cambric

    Institute of Scientific and Technical Information of China (English)

    黄故

    2004-01-01

    Analytical examination was made to ascertain the effect of the high pressure water flow on the fabric properties.Polyester/cotton blended cambric was spurted by high pressure water flow. Fabric properties such as handle,thickness, tensile strength , stiffness and air permeability after the water treatment were investigated.

  10. Resisting protein adsorption on biodegradable polyester brushes.

    Science.gov (United States)

    Hu, Xinfang; Gorman, Christopher B

    2014-08-01

    The protein adsorption and degradation behaviors of poly(lactic acid), poly(glycolic acid) (PGA) and poly(ε-caprolactone) (PCL) brushes and their co-polymer brushes with oligo(ethylene glycol) (OEG) were studied. Both brush structure and relative amount of OEG and polyester were found to be important to the protein resistance of the brushes. A protein-resisting surface can be fabricated either by using OEG as the top layer of a copolymer brush or by increasing the amount of OEG relative to polyester when using a hydroxyl terminated OEG (OEG-OH) and a methoxy terminated OEG (OEG-OMe) mixture as the substrate layer. The degradation of single polyester brushes and their co-polymer brushes using OEG-OH as a substrate layer or using OEG as a top layer was hindered. This phenomenon was rationalized by the inhibition of the proposed back-biting process as the hydroxy end groups of polyester were blocked by OEG molecules. Among these brushes tested, PGA co-polymer brushes using the methoxy/hydroxyl OEG mixture as the substrate layer proved to be both protein-resistant and degradable due to the relatively large amount of OEG moieties and the good biodegradability of PGA.

  11. Polyester fabric alkali peeling and dyeing with disperse dyes in one-bath process%涤纶织物分散染料减染一浴法染色

    Institute of Scientific and Technical Information of China (English)

    高丽贤

    2014-01-01

    传统的涤纶织物碱减量和染色都是在两浴条件下进行,不仅浪费能源,而且工艺繁琐。为此,选用耐碱性分散染料对涤纶织物按照3种染色工艺流程进行碱减量和染色一浴法试验,探讨了加入促进剂对减量效果的影响。结果表明:工艺流程2适合碱减量和染色一步法,染色织物的牢度在4级以上,重现性达到4~5级;染色过程中加入促进剂可提高减量效果,减少了烧碱的使用,实现了节能环保。%The traditional process of alkali peeling and dyeing was carried out in two bath process, which is not only waste of energy but also complicated. According to three kinds of dyeing processes, polyester fabric alkali peeling and dyeing with alkaline stable disperse dye were tested in one-bath process, and the influence on alkali peeling through adding accelerator was discussed. The result shows that process 2 is suitable for alkali peeling and dyeing, the color fastness of the dyed fabrics reaches 4 scale or above, reproducibility reaches 4~5 scale. The effect of alkali peeling can be improved by adding accelerator, the use of caustic soda is reduced and realize eco-environmental.

  12. Identification of a keratinase-producing bacterial strain and enzymatic study for its improvement on shrink resistance and tensile strength of wool- and polyester-blended fabric.

    Science.gov (United States)

    Cai, Shao-Bo; Huang, Zheng-Hua; Zhang, Xing-Qun; Cao, Zhang-Jun; Zhou, Mei-Hua; Hong, Feng

    2011-01-01

    A wool-degrading bacterium was isolated from decomposition wool fabrics in China. The strain, named 3096-4, showed excellent capability of removing cuticle layer of wool fibers, as demonstrated by removing cuticle layer completely within 48 h. According to the phenotypic characteristics and 16S rRNA profile, the isolate was classified as Pseudomonas. Bacteria growth and keratinase activity of the isolate were determined during cultivation on raw wool at different temperatures, initial pH, and rotation speed using orthogonal matrix method. Maximum growth and keratinase activity of the bacterium were observed under the condition including 30 °C, initial pH 7.6, and rotational speeds 160 rpm. The keratinase-containing crude enzyme prepared from 3096-4 was evaluated in the treatment of wool fabrics. The optimal condition of our enzymatic improvement of shrink resistance was the combination of 30 °C, initial pH 7.6, and rotation speeds 160 rpm. After the optimized treatment, the wool fabrics felting shrink was 4.1% at 6 h, and textile strength was not lost.

  13. Photovoltaic fabrics

    Science.gov (United States)

    2015-04-22

    during wire fabrication. Weaving was demonstrated for both military-type nylon -cotton blend (NYCO) warp fibers and cotton-polyester warp fibers. A...Lowell, MA 01852 14. ABSTRACT This report describes a project to improve photovoltaic fabrics. It had four objectives: 1) Efficiency – make PV wires on...a continuous basis that exhibit 7% efficiency; 2) Automated Welding – demonstrate an automated means of interconnecting the electrodes of one wire

  14. Dyeing Property of Reactive Disperse Dyes on Wool/Polyester Blended Fabric%毛/涤混纺织物改性分散染料染色性能研究

    Institute of Scientific and Technical Information of China (English)

    张炜栋; 黄旭

    2014-01-01

    本文研发了一种新型的改性分散染料并对其染色性能进行研究。将β-乙烯砜硫酸酯活性基团引入到分散染料分子中,合成新的反应型分散染料,β-乙烯砜硫酸酯活性基团与羊毛形成共价键从而上染纤维,分散染料则上染涤纶。这种改性分散染料在pH值7,100℃时具有最高上染百分率。研究发现,含有双β-乙烯砜硫酸酯活性基团的改性分散染料的染色性能优于含单个活性基团的改性分散染料。改性分散染料的摩擦、皂洗和汗渍牢度较好。%A kind of new reactive disperse dye and its dyeing properties were researched. The bis-sulphatoethylsolphone reactive groups were introduced into the disperse dye and formed a new reactive disperse dye. The bis-sulphatoethylsolphone reactive groups could form covalent bond with wool and disperse dyes could be taken up to polyester. Maximum exhaustion values were observed at pH value 7 and 100℃. The dyes containing bis-sulphatoethylsolphone reactive groups had better dyeing properties compared with mono-sulphatoethylsulphone reactive group dyes. All dyed fabrics had good rub fastness, soaping fastness and perspiration fastness.

  15. 磁控溅射工艺参数对涤纶织物结构色出色效果的影响%Effect of Magnetron Sputtering Process Parameters on Polyester Fabric Structural Color

    Institute of Scientific and Technical Information of China (English)

    叶丽华; 杜文琴

    2015-01-01

    Structural colors were fabricated on polyester fabric substrates with periodic films TiO2 and SiO2 by the magnetron sputtering RF method. The morphology of the structural colors on the fabric and surface color effect were characterized by Scanning Electron Microscopy and Ultra-depth 3Dmicroscope. The color differences of the fabric before and after coating were measured with a spectrophotometer. Also the multi-angle reflection and scattered light spectrums were measured by R1 macroscopic angle resolution meters, the fabric structural colors were characterized by precise quantification, and the influence of the five different process parameters (target-substrate distance, sputtering period, gas flow, working gas pressure, and sputtering power) were explored by changing the sputtering technology. The results show that when the target-substrate distance was40mm, working gas pressure5Pa, thegas flow15sccm, the sputtering cycle above 3, and the sputtering power over 84W, the fabric structural color was already obvious, small adjustment of sputtering power and sputtering cycle was of slight influence to the structural color, but the target-substrate distance and working gas pressure had obvious influence on the structural colors, and when the work pressure was set at 3 Pa and the target distance at30mmin the sputtering atmosphere set at the lab, the structural color was the best.%采用射频磁控溅射法,在涤纶平纹白坯布上溅射 2SiO 、 2TiO 周期薄膜成功制备出了织物结构色. 利用场发射扫描电镜和超景深三维显微镜对织物结构色的表面形貌和出色效果进行表征,并用分光光度计测量镀膜前后织物的色度差,同时,应用宏观角分辨光谱仪 R1测得织物的多角度反射和散射光谱图,以精确量化描述织物结构色. 通过改变溅射工艺,探究了靶基距、溅射周期、气体流量、工作气压和溅射功率等 5个不同的溅射工艺参数对织物结构色出色效果的

  16. Degradation of microbial polyesters.

    Science.gov (United States)

    Tokiwa, Yutaka; Calabia, Buenaventurada P

    2004-08-01

    Microbial polyhydroxyalkanoates (PHAs), one of the largest groups of thermoplastic polyesters are receiving much attention as biodegradable substitutes for non-degradable plastics. Poly(D-3-hydroxybutyrate) (PHB) is the most ubiquitous and most intensively studied PHA. Microorganisms degrading these polyesters are widely distributed in various environments. Although various PHB-degrading microorganisms and PHB depolymerases have been studied and characterized, there are still many groups of microorganisms and enzymes with varying properties awaiting various applications. Distributions of PHB-degrading microorganisms, factors affecting the biodegradability of PHB, and microbial and enzymatic degradation of PHB are discussed in this review. We also propose an application of a new isolated, thermophilic PHB-degrading microorganism, Streptomyces strain MG, for producing pure monomers of PHA and useful chemicals, including D-3-hydroxycarboxylic acids such as D-3-hydroxybutyric acid, by enzymatic degradation of PHB.

  17. Propriedades mecânicas de tração de compósitos poliéster/tecidos híbridos sisal/vidro Properties of polyester/hibrid sisal-glass fabrics

    Directory of Open Access Journals (Sweden)

    Laura H. de Carvalho

    2006-03-01

    Full Text Available O desempenho e o custo de compósitos podem ser alterados por hibridização e, neste sentido, é relativamente comum o uso combinado de fibras e reforços minerais no desenvolvimento destes materiais. No presente trabalho o desempenho mecânico de compósitos poliéster insaturado/ tecidos híbridos sisal-vidro foram investigados em função do teor de fibra e direção do teste. Foram confeccionados três tecidos híbridos (com 30, 40 e 50% em peso de vidro com fios de sisal no urdume e fibras de vidro na trama. Os compósitos foram moldados por compressão à temperatura ambiente com os tecidos alinhados. Os resultados indicam que houve um aumento nas propriedades mecânicas de tração de todos os compósitos com o aumento do teor de fibras. Para os compósitos reforçados por tecidos com baixo teor de fibra de vidro, as propriedades tenderam a ser mais elevadas quando os testes foram conduzidos na direção do sisal, enquanto que para os tecidos com elevado teor de vidro, o oposto foi observado. Estes comportamentos foram associados ao teor de fibra de vidro na direção do teste e ao diâmetro das fibras de sisal. Em baixos teores de fibra o sisal agiria como inclusão ou defeito, prejudicando as propriedades mecânicas; em elevados teores as propriedades do vidro suplantariam os defeitos provocados pelo sisal.Hybridization can alter both mechanical performance and cost of polymer composites, and novel composite materials can be obtained by the combination of both fibrous and mineral reinforcements. In the present work the mechanical performance of unsaturated polyester/hybrid sisal-glass fabrics was determined as a function of fibre content and test direction. Three different hybrid fabrics (30, 40 and 50% w/w glass content with sisal strings in the warp and glass roving in the weft were hand weaved. Aligned fabric compression moulded composites were obtained at room temperature. The results showed enhanced properties with fibre content

  18. Synthesis and Application of Easy Hydrolysis Degradable Polyester

    Institute of Scientific and Technical Information of China (English)

    张大省; 李燕立; 陈英; 付中玉; 王锐; 李梅

    2001-01-01

    An easy hydrolysis degradable polyester (EHDP) is synthesized; the fiber produced from which can be hydrolyzed by dilute basic solution easily. The properties of these kind polyesters are measured. The results show that this kind polymer is suitable to be spun into filament The EHDP can be spun into staple fiber and manufactured into non-woven fabric. This fabric is used as disposable clothes. In composite spinning, the PET (polyethylen glycol terephthalate) or PA (polyamide) is used as continuous phase, and EHDP used as dispersed phase. Then the fabric of this kind fiber is treated by basic solution; the ultra-fine fiber fabric is obtained.The fineness of the fiber is about 0.045 dtex. In blend spinning, EHDP is mixed with polypropylene (PP) to produce hollow fiber with micro-holes in radical direction. This fiber is a usable material in filter especially in medical use.

  19. 废旧涤/棉混纺织物NIRS定性分析模型的建立与外部验证%The Establishment and External Validation of NIR Qualitative Analysis Model for Waste Polyester-Cotton Blend Fabrics

    Institute of Scientific and Technical Information of China (English)

    李枫; 李文霞; 赵国樑; 唐世君; 李学娇; 吴红梅

    2014-01-01

    利用近红外光谱技术对354个废旧涤/棉混纺织物进行研究,通过偏最小二乘法(partial least squares ,PLS )和定性鉴别系数建立了不同光谱特征的涤/棉混纺织物近红外定性分析模型。染色涤/棉混纺织物N IR光谱主要有两大类,一类具有正常涤/棉光谱特征,另一类光谱由于样本中染料、颜料和消光剂等化学助剂的影响,使光谱谱线成斜线,失去其光谱特征。如以全部样本建模,模型识别率较低。故将样本分为两类:斜线光谱样本和正常光谱样本,分别建立NIR定性分析模型。NIR定性分析模型建立后,根据验证结果分别对建模的谱区、预处理方法和主因子数进行优化,以提高模型的稳健性和可靠性。结果表明,样本分别建模后,模型的识别率大大提高,用验证集样本进行内部验证,正常光谱和斜线光谱所建模型的识别率均达99%,其校正集相关系数 RC 均为0.991,验证集相关系数 RP 分别为0.983和0.984、校正标准差S EC分别为0.887和0.453、预测标准差SEP分别为1.131和0.573。用150个界外样本分别对正常光谱样本模型和斜线光谱样本模型进行外部预测检验,模型识别率分别达91.33%和88.00%,表明所建NIR定性分析模型能够较好地在回收现场进行涤/棉混纺织物的鉴别。%A series of 354 polyester-cotton blend fabrics were studied by the near-infrared spectra (NIRS ) technology ,and a NIR qualitative analysis model for different spectral characteristics was established by partial least squares (PLS) method combined with qualitative identification coefficient .There were two types of spec-trum for dying polyester-cotton blend fabrics :normal spectrum and slash spectrum .The slash spectrum loses its spectral characteristics ,which are effected by the samples’ dyes ,pigments ,matting agents and other chemical additives .It was in low recognition rate when the

  20. Influence of cationic gelatin protein agent with 1227 on the alkali deweighting of polyester fabrics%阳离子明胶蛋白助剂与1227复配对涤纶碱减量效果的影响

    Institute of Scientific and Technical Information of China (English)

    范云丽; 王雪燕

    2015-01-01

    The effects of compound of cationic gelatin protein agent with 1227 on promoting loss weight rate and reduction rate of polyester were studied . The effects of this compound on w hiteness , hygroscopicity , permeability , bursting strength , softness , draping , antistatic property of polyester and dyeing performance of disperse dyes w ere discussed . T he results showed that the compound with appropriate proportion of cationic gelatin protein agent and 1227 had synergistic effect ,significantly improved reduction rate and reduced the dosage of so‐dium hydroxide in alkaline deweighting for polyester fabrics .At the same time ,the hygroscop‐icity ,bursting strength ,softness ,draping ,antistatic property and dyeing performance dis‐perse dyes of the fabric treated with the compound were superior to the fabric treated with sep‐arate cationic gelatin protein agent or 1227 .And the whiteness and permeability of the fabric treated with the compound were also superior to that of separate cationic gelatin protein agent . The etching of the fabric treated with the compound in alkaline deweighting was less .%研究阳离子明胶蛋白助剂与1227复配对促进涤纶碱减量率和减量速率的影响,并讨论二者复配对涤纶织物服用性能及分散染料上染色性能的影响。结果表明,阳离子明胶蛋白助剂与1227按适当比例复配对涤纶碱减量有很好的协同促进作用,能显著提高减量速率,降低碱用量;经复配助剂处理的碱减量涤纶织物的吸湿性、顶破强力、柔软性、悬垂性、抗静电性以及对分散染料的吸附性能均优于单独采用阳离子明胶蛋白助剂或1227作促进剂的碱减量涤纶织物;而且复配助剂处理织物表面刻蚀物较少,织物白度以及透气性优于单独采用阳离子明胶蛋白助剂处理织物。

  1. 玄武岩纤维改进亚麻纤维/不饱和聚酯复合材料的耐候性%Aging-resistant performance of flax/basalt fiber fabrics reinforced unsaturated polyester resin hybrid composites

    Institute of Scientific and Technical Information of China (English)

    杨越飞; 徐建锋; 赖佳佳; 郑峰; 宋剑斌; 杨文斌

    2015-01-01

    In recent years, there has been increasing interest in the use of natural fiber reinforced polymer in many fields due to low density, high specific strength and eco-friendly property. However, the application of composites is faced with difficulties in outdoor environment, such as water absorption, degradation, low mechanic strength and dimensional stability. In order to improve the aging-resistant property of flax fiber fabrics/basalt fiber fabrics reinforced UP (unsaturated polyester resin), the author used the artificial simulating climate box (ultraviolet and condensation) to accelerate ageing process of HCM (hybrid composite materials), which was composed of different sandwich layers and included H1, H2 and H3 representing basalt fiber content of total fibers of 20.3%, 41.5%and 63.7%, respectively. Mechanical properties, DMA (dynamic mechanical analysis) performance and microstructure of HCM were affected by basalt fiber content and aging time. The result showed that both flexural strength and impact strength first increased and then decreased with aging time. The retention of flexural strength was 62.5%, 58.1%and 57.0%for H1, H2 and H3, respectively. With regard to impact strength, the figures were 66.8%, 66.7%and 53.2%for H1, H2 and H3, respectively. The results of ANOVA (analysis of variance) and LSD (least-significant difference) illustrated that ultraviolet aging time had significant effects on flexural strength of H3 (P0.05). As ultraviolet aging time increased, rigidity and frangibility of HCM increased gradually. The poor interfacial adhesion was demonstrated between flax fiber and UP by DMA. The result of SEM (scan electron microscope) indicated a poor interfacial adhesion between flax and UP matrix, such as debonding and more voids. However, basalt fibers and UP matrix were combined closely and matrix fragments around basalt fibers were found. The main reason was that hydrogen bond produced after absorbing water destroyed the interface between flax

  2. 21 CFR 177.1590 - Polyester elastomers.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 3 2010-04-01 2009-04-01 true Polyester elastomers. 177.1590 Section 177.1590... Components of Single and Repeated Use Food Contact Surfaces § 177.1590 Polyester elastomers. The polyester...) For the purpose of this section, polyester elastomers are those produced by the ester...

  3. Liquid crystal polyester thermosets

    Science.gov (United States)

    Benicewicz, Brian C.; Hoyt, Andrea E.

    1992-01-01

    The present invention provides (1) curable liquid crystalline polyester monomers represented by the formula: R.sup.1 --A.sup.1 --B.sup.1 --A.sup.2 --B.sup.2 --A.sup.3 --R.sup.2 where R.sup.1 and R.sup.2 are radicals selected from the group consisting of maleimide, substituted maleimide, nadimide, substituted naimide, ethynyl, and (C(R.sup.3).sub.2).sub.2 where R.sup.3 is hydrogen with the proviso that the two carbon atoms of (C(R.sup.3).sub.2).sub.2 are bound on the aromatic ring of A.sup.1 or A.sup.3 to adjacent carbon atoms, A.sup.1 and A.sup.3 are 1,4-phenylene and the same where said group contains one or more substituents selected from the group consisting of halo, e.g., fluoro, chloro, bromo, or iodo, nitro lower alkyl, e.g., methyl, ethyl, or propyl, alkoxy, e.g., methoxy, ethoxy, or propoxy, and fluoroalkyl, e.g., trifluoromethyl, pentafluoroethyl and the like, A.sup.2 is selected from the group consisting of 1,4-phenylene, 4,4'-biphenyl, 2,6-naphthylene and the same where said groups contain one or more substituents selected from the group consisting of halo, e.g., fluoro, chloro, bromo, or iodo, nitro, lower alkyl, e.g., methyl, ethyl, and propyl, lower alkoxy, e.g., methoxy, ethoxy, or propoxy, and fluoroalkyl or fluoroalkoxy, e.g., trifluoromethyl, pentafluoroethyl and the like, and B.sup.1 and B.sup.2 are selected from the group consisting of --C(O)--O-- and --O--C(O)--, (2) thermoset liquid crystalline polyester compositions comprised of heat-cured segments derived from monomers represented by the formula: R.sup.1 --A.sup.1 --B.sup.1 --A.sup.2 --B.sup.2 --A.sup.3 --R.sup.2 as described above, (3) curable blends of at least two of the polyester monomers and (4) processes of preparing the curable liquid crystalline polyester monomers.

  4. Pressure polymerization of polyester

    Science.gov (United States)

    Maurer, Charles J.; Shaw, Gordon; Smith, Vicky S.; Buelow, Steven J.; Tumas, William; Contreras, Veronica; Martinez, Ronald J.

    2000-08-29

    A process is disclosed for the preparation of a polyester polymer or polyester copolymer under superatmospheric pressure conditions in a pipe or tubular reaction under turbannular flow conditions. Reaction material having a glycol equivalents to carboxylic acid equivalents mole ratio of from 1.0:1 to 1.2:1, together with a superatmospheric dense gaseous medium are fed co-currently to the reactor. Dicarboxylic acid and/or diol raw materials may be injected into any of the reaction zones in the process during operation to achieve the overall desired mole ratio balance. The process operates at temperatures of from about 220.degree. C. to about 320.degree. C., with turbannular flow achieved before the polymer product and gas exit the reactor process. The pressure in the reaction zones can be in the range from 15 psia to 2500 psia. A polymer product having a DP of a greater than 40, more preferably at least about 70, is achieved by the transfer of water from the reacting material polymer melt to the gaseous medium in the reactor.

  5. 玄武岩纤维布/不饱和聚酯复合材料耐老化性能%Aging-resistant performance of basalt fabrics/unsaturated polyester resin composites

    Institute of Scientific and Technical Information of China (English)

    杨越飞; 杨文斌; 徐建锋; 赖佳佳; 宋剑斌; 张欣向

    2014-01-01

    为探明玄武岩纤维/不饱和聚酯(UP,unsaturated polyester resin)复合材料的耐候性和力学性能,通过人工模拟加速气候箱对复合材料进行紫外光和冷凝处理,并测试、分析老化前后复合材料的力学性能、微观结构及化学结构的变化。力学性能测试发现,老化后的复合材料力学性能下降明显,拉伸强度、断裂伸长率、弯曲强度和弹性模量与未老化相比分别下降了35%、20%、60%和52%。扫描电子显微镜(SEM,scan electron microscope)观察老化前后的复合材料,发现包裹在纤维周围的树脂逐渐脱落,基体降解并产生碎片和横向裂纹并不断扩展形成多级开裂。傅立叶红外光谱分析(FTIR,Fourier transform infrared spectrum)测试发现,老化后的复合材料在1725 cm-1处的酯羰基吸收峰减弱,1280和1130 cm-1处酯基消失;同时,在747和702 cm-1处的邻苯型1,2-二取代吸收峰也消失。研究结果表明,不饱和聚酯上的羰基与双键或苯环上的羰基共轭体系发生变化,使酯羰基分解产生 CO;同时,聚酯发生链断裂、自由基终止等交联反应。玄武岩纤维/UP 复合材料的耐老化研究有利于延长该产品的使用寿命,对下一阶段制备玄武岩纤维/亚麻纤维混杂复合材料的耐候性和力学性能提供参考依据。%Fiber-reinforced composites made up of unsaturated polyester resin (UP) matrices reinforced with glass, carbon and aramid fibers were commonly standard structural materials in engineering fields. In recent years, basalt fibers, have recently gained an increasing attention as possible replacement of the conventional glass or carbon fibers due to their advantages in terms of environmental-friendly, cost-effective, high chemical and physical properties. In order to verify the mechanical properties of basalt fiber fabrics/UP composites, the author used the artificial simulating climate box (UV and

  6. Preparation of low-melting point copolyester bonding fiber from post-consumer polyester fabric by glycolysis%废旧涤纶织物醇解再生制备低熔点粘合纤维

    Institute of Scientific and Technical Information of China (English)

    钱军; 王少博; 邢喜全; 王朝生; 王方河; 王赛博; 林世东

    2016-01-01

    Polyethylene terephthalate ( PET) was recycled from post-consumer PET fabric by ethylene glycol glycolysis and was copolymerized with isophthalic acid and 1,4-butanediol as modified monomers during the chemical recycling process to produce a low-melting point copolyester ( LPET) .And a recycled low-melting point PET bonding fiber was prepared by using the recycled PET as the core and the recycled LPET as the sheath at a certain proportion via sheath -core composite spinning process prior to tensile post-processing .The results showed that the recycled PET had the similar thermal stability and the recycled LPET had the lower thermal stability than normal bright PET , giving no impact on the processing and application; the recycled LPET had the softening point of 76℃and the melting point of 125℃;the recycled low-melting point PET bonding fiber could be prepared with the linear density of 4.6 dtex, breaking strength 3.22 cN/dtex, elongation at break 48.2%, dry-hot shrinkage 5.6%, moisture regain 0.41%, perfectly satisfying the requirements of FZ/T 52010-2014 Recycled Polyester Staple Fiber , under the conditions as followed:sheath-core mass ratio 4:6, spinning temperature 280 ℃, quenching temperature 22 ℃, quenching speed 1.2 m/s,spinning speed 1 100 m/min, drawing bath temperature 60-65 ℃, draw ratio 2.9.%以废旧涤纶织物为原料,采用乙二醇醇解法对废旧涤纶织物进行化学再生,制得再生聚对苯二甲酸乙二醇酯(PET);在化学再生过程中以间苯二甲酸,1,4-丁二醇为改性单体进行共聚,制得再生低熔点共聚酯( LPET);采用皮芯复合纺丝工艺将再生LPET(皮)与再生PET(芯)按一定复合比例进行纺丝并进行拉伸后处理,制得再生低熔点PET粘合纤维。结果表明:与常规大有光PET比较,再生PET的热稳定性与之相近,再生LPET的热稳定性稍差,但不影响其加工应用;再生LPET的软化温度为76℃,熔融温度为125

  7. Biomedical Applications of Biodegradable Polyesters

    Directory of Open Access Journals (Sweden)

    Iman Manavitehrani

    2016-01-01

    Full Text Available The focus in the field of biomedical engineering has shifted in recent years to biodegradable polymers and, in particular, polyesters. Dozens of polyester-based medical devices are commercially available, and every year more are introduced to the market. The mechanical performance and wide range of biodegradation properties of this class of polymers allow for high degrees of selectivity for targeted clinical applications. Recent research endeavors to expand the application of polymers have been driven by a need to target the general hydrophobic nature of polyesters and their limited cell motif sites. This review provides a comprehensive investigation into advanced strategies to modify polyesters and their clinical potential for future biomedical applications.

  8. Polyester based hybrid organic coatings

    Science.gov (United States)

    Wang, Xiaojiang

    Polyesters are a class of polymers widely used in organic coatings applications. In this work, four types of organic coatings based on polyester polyols were prepared: UV-curable polyester/poly(meth)acrylate coatings, thermal curable polyester polyurethane-urea coatings, thermal curable non-isocyanate polyurethane coatings, and UV-curable non-isocyanate polyurethane coatings. Polyester/poly(meth)acrylate block copolymers are synthesized using a combination of polycondensation and Atom-Transfer Radical Polymerization (ATRP). All block copolymers are characterized by means of Nuclear Magnetic Resonance (NMR) and Gel Permeation Chromatography (GPC). In the case of unsaturated-polyester-based block copolymers the main chain double bond in the polyester backbone remains almost unaffected during ATRP. The unsaturated block copolymers are crosslinkable and can form networks upon photo-irradiation in the presence of a suitable photoinitiator. These copolymers might be interesting candidates for coatings with better overall properties than those based on neat polyesters. Thermal curable polyester polyol based Polyurethane-Urea (PUU) coatings were formulated using Partially Blocked HDI isocyanurate (PBH), Isophorone Diamine (IPDA), and polyester polyol. As a comparison, the polyurethane coatings (PU) without adding IPDA were also prepared. The mechanical and viscoelastic properties of the PUU and PU coating were investigated by using tensile test and Dynamic Mechanical Thermal Analyzer (DMTA). It was found that PUU coating exhibited higher crosslink density, Tg, tensile modulus and strength than the corresponding PU coating. Thermal curable non-isocyanate polyurethane coatings were prepared by using polyamine and cyclic carbonate terminated polyester. Cyclic carbonate terminated polyester was synthesized from the reaction of the carbon dioxide and epoxidized polyester which was prepared from the polyester polyol. The properties of the epoxidized and cyclic carbonate

  9. Fabrication

    Directory of Open Access Journals (Sweden)

    E.M.S. Azzam

    2013-12-01

    Full Text Available In the present work, the nanoclay composites were fabricated using the synthesized poly 6-(3-aminophenoxy hexane-1-thiol, poly 8-(3-aminophenoxy octane-1-thiol and poly 10-(3-aminophenoxy decane-1-thiol surfactants with gold nanoparticles. The polymeric thiol surfactants were first assembled on gold nanoparticles and then impregnated into the clay matrix. Different spectroscopic and microscopic techniques such as X-ray diffraction (XRD, Scanning electron microscope (SEM and Transmission microscope (TEM were used to characterize the fabricated nanoclay composites. The results showed that the polymeric thiol surfactants assembled on gold nanoparticles are located in the interlayer space of the clay mineral and affected the clay structure.

  10. Biomedical Applications of Biodegradable Polyesters

    OpenAIRE

    Iman Manavitehrani; Ali Fathi; Hesham Badr; Sean Daly; Ali Negahi Shirazi; Fariba Dehghani

    2016-01-01

    The focus in the field of biomedical engineering has shifted in recent years to biodegradable polymers and, in particular, polyesters. Dozens of polyester-based medical devices are commercially available, and every year more are introduced to the market. The mechanical performance and wide range of biodegradation properties of this class of polymers allow for high degrees of selectivity for targeted clinical applications. Recent research endeavors to expand the application of polymers have be...

  11. 超细旦涤纶与棉、汉麻等异经异纬提花织物的开发%On Developing Jacquard Fabric with Different Warps and Wefts of Blended Yarns between Ultra-ifne Polyester and Cotton, Hemp and Other Fibers

    Institute of Scientific and Technical Information of China (English)

    张俊利

    2014-01-01

    The paper discusses the key techniques for producing mini-jacquard woven fabric using blended yarns between ultra-fine polyester and cotton, hemp and other fibers as warps and wefts. By analyzing fabric style and difficulties in production, it suggests the rational process route and optimized parameters for warping, sizing and weaving processes. The resulted fabric has special stripped structure and unique look, offering reference for developing and producing high-grade apparel fabric.%探讨了超细旦涤纶与棉、汉麻等异经异纬提花织物生产技术的要点。通过对该面料的织物风格以及生产难点进行分析,选择合理的工艺流程,优化整经、浆纱织造等工序的工艺参数。面料具有特殊的条形结构,风格独特,为高档服装面料的开发及生产提供参考。

  12. The interlaminar strength of the glass fiber polyester composite

    Directory of Open Access Journals (Sweden)

    S. Putić

    2009-01-01

    Full Text Available The paper outlines the method and the results of the experimental investigation of interlaminar strength of glass fibre reinforced polyester composites, with the aim of determining the influence that the structure, a reinforcement type and a sort of resin exert upon the interlaminar strength. The tested specimens were fabricated under different formation conditions, namely in eight composition patterns and with three sorts of resin used for polymerization.

  13. Degradation of Polyester Polyurethane by Bacterial Polyester Hydrolases

    Directory of Open Access Journals (Sweden)

    Juliane Schmidt

    2017-02-01

    Full Text Available Polyurethanes (PU are widely used synthetic polymers. The growing amount of PU used industrially has resulted in a worldwide increase of plastic wastes. The related environmental pollution as well as the limited availability of the raw materials based on petrochemicals requires novel solutions for their efficient degradation and recycling. The degradation of the polyester PU Impranil DLN by the polyester hydrolases LC cutinase (LCC, TfCut2, Tcur1278 and Tcur0390 was analyzed using a turbidimetric assay. The highest hydrolysis rates were obtained with TfCut2 and Tcur0390. TfCut2 also showed a significantly higher substrate affinity for Impranil DLN than the other three enzymes, indicated by a higher adsorption constant K. Significant weight losses of the solid thermoplastic polyester PU (TPU Elastollan B85A-10 and C85A-10 were detected as a result of the enzymatic degradation by all four polyester hydrolases. Within a reaction time of 200 h at 70 °C, LCC caused weight losses of up to 4.9% and 4.1% of Elastollan B85A-10 and C85A-10, respectively. Gel permeation chromatography confirmed a preferential degradation of the larger polymer chains. Scanning electron microscopy revealed cracks at the surface of the TPU cubes as a result of enzymatic surface erosion. Analysis by Fourier transform infrared spectroscopy indicated that the observed weight losses were a result of the cleavage of ester bonds of the polyester TPU.

  14. Synthesis of ionic liquids [bmim]BF4 and its impact on the antistatic property of polyester fabric%离子液体[bmim]BF4的合成及其对涤纶织物抗静电性能的影响

    Institute of Scientific and Technical Information of China (English)

    郑小佳

    2013-01-01

    研究了离子液体[bmim]BF4的合成,采用IR、1HNMR进行结构表征;分析了离子液体用量、轧余率、焙烘温度对涤纶织物抗静电性能的影响。结果表明:成功合成离子液体[bmim]BF4;[bmim]BF4用量25 g/L、轧余率80%、焙烘温度170℃时,整理的涤纶织物具有较好的抗静电性能,但耐洗性较差。通过TiO2/SiO2水溶胶进行后处理可以提高其耐洗性。%The synthesis of ionic liquids [bmim]BF4 was investigated and the structure of product was characterized by IR and 1HNMR. The effects of the dosage of ionic liquids [bmim]BF4, wet pickup and the cur-ing temperature on the antistatic property of polyester fabric were discussed. The results showed that the ion-ic liquids [bmim]BF4 was successful y synthesized. The finished polyester fabric had good antistatic properties when the dosage of [bmim]BF4 was 25 g/L, wet pickup was 80% and the curing temperature was 170 ℃, however, the durability was poor. The durability could be improved by the treatment of TiO2/SiO2 hydrosol.

  15. Mechanical and Morphological Properties of Nano Filler Polyester Composites

    Directory of Open Access Journals (Sweden)

    Bonnia Noor Najmi

    2016-01-01

    Full Text Available This research is focusing on mechanical and morphological properties of unsaturated polyester (UP reinforced with two different types of filler which is nano size clay Cloisite 30B (C30B and Carbon Black (CB. Samples were fabricated via hand lay-up and open molding technique. Percentages of Cloisite 30B & Carbon Black (CB used vary from 0, 2, 4, 6, 8 and 10 wt%. The mechanical properties were evaluated by impact, flexural and hardness testing. Result shows that the mechanical strength of C30B was better compare to CB filled composite. The combination of UP with C30B helps to improve the properties due to the high surface area of nanosize filler in the matrix. The result shows that increasing of filler content had increased mechanical properties of composites. Optimum percentage represent good mechanical properties are 4% for both fillers. SEM images showed that rough surface image indicate to agglomeration of filler in the matrix for CB sample and smooth surface image on C30B sample indicate to homogenous blending between filler and matrix polyester. SEM images proved that mechanical properties result indicate that C30B polyester composite is a good reinforcement compare to CB polyester composite.

  16. 40 CFR 721.9507 - Polyester silane.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 30 2010-07-01 2010-07-01 false Polyester silane. 721.9507 Section 721... Polyester silane. (a) Chemical substance and significant new uses subject to reporting. (1) The chemical substance identified as a polyester silane (P-95-1022) is subject to reporting under this section for...

  17. Effect of Charge and Hydrophobicity on Adsorption of Modified Starches on Polyester.

    Science.gov (United States)

    Samu; Moulee; Kumar

    1999-12-15

    Polyester fabric (poly(ethylene terephthalate)) is a hydrophobic polymer. Its hydrophobic nature can be a disadvantage for certain applications like dyeing, finishing, detergency, etc. Physical or chemical modification of the polyester to make it more hydrophilic is therefore desirable for certain performance characteristics. Surface modification of polyester to make it hydrophilic can be achieved by adsorbing polymers on the polyester surface. Starch is a commonly available, hydrophilic polymer used in many textile applications that can be used to modify polyester. However, it needs to be chemically modified so that it can adsorb on the polyester fabric and physically modify the fabric characteristics. The polymers used in this study are two different modified starches-cationic and anionic starches and mixtures of the two. The adsorption kinetics on a polyester substrate was studied. The effect of charge and hydrophobicity on adsorption was investigated. Cationic starches were shown to readily adsorb on polyester and this was attributed to electrostatic interactions. Hydrophobic substituents on the cationic moiety resulted in increased adsorption. This was attributed to the weak hydrophobic interaction between the polymer chains which could result in a more coiled polymer conformation. It is hypothesized that more starch molecules are required for surface coverage of the polyester, resulting in an increase in adsorption. Anionic starch was adsorbed on the substrate but at a slower rate than the cationic starches. It is likely that there is a H bonding between acid groups on the starch and the ester groups of the polyester. However, the anionic starch is desorbed when the polyester is placed in an aqueous medium. When a blend of cationic starch and anionic starch was used, a low concentration of anionic starch was seen to increase adsorption, indicating that the polyelectrolyte complex itself may be adsorbing on the substrate. Further increases cause a decrease in

  18. Catalytic water dissociation using hyperbranched aliphatic polyester (Boltorn series) as the interface of a bipolar membrane.

    Science.gov (United States)

    Xue, Yanhong; Xu, Tongwen; Fu, Rongqiang; Cheng, Yiyun; Yang, Weihua

    2007-12-15

    The effect of hyperbranched aliphatic polyester (Boltorn series) on the water dissociation in bipolar membranes was firstly investigated in this paper. The bipolar membranes were prepared by immersing the anion exchange layer in a hyperbranched aliphatic polyester solution and then coating on the layer a polyphenylene oxide (SPPO) solution. The SEM observations proved the existence of hyperbranched aliphatic polyester at the membrane intermediate layer. The adsorption amount was evaluated by the oxygen content via XPS. The junction thickness of the prepared bipolar membrane was determined by electrochemical impedance spectroscopy (EIS), and the membrane performances were evaluated by current-voltage curves. The results showed that the amount and generation of Boltorn series, and temperature all affected I-V behaviors of the fabricated bipolar membranes, and the former two played the critical role. These effects were explained on the basis of the water dissociation theory and the characteristics of hyperbranched aliphatic polyester.

  19. PEGylated polyester-based nanoncologicals.

    Science.gov (United States)

    Conte, Claudia; d'Angelo, Ivana; Miro, Agnese; Ungaro, Francesca; Quaglia, Fabiana

    2014-01-01

    Several PEGylated polyester-based nanoncologicals have been proposed in the literature, some of them nowadays being under preclinical/clinical trials or marketed. In this review, we describe the main features of PEGylated polyesters and their correspondent nanocarriers. A first part is devoted to intravenously injectable PEGylated nanocarriers, which represent the systems most investigated so far. After describing fundamental design rules dictated by the administration route, PEGylated nanocarriers currently under preclinical/clinical investigation or in the market will be described from a technological point of view and related therapeutic implications discussed. Finally, new perspective of use of PEGylated nanocarriers for oral and pulmonary delivery of anticancer drugs will be considered.

  20. The utility of polyester and cotton as swabbing substrates for the removal of cellular material from surfaces.

    Science.gov (United States)

    Mulligan, Christina M; Kaufman, Stacie R; Quarino, Lawrence

    2011-03-01

    Various types of cotton and polyester fabrics were tested to ascertain the optimal physical and chemical characteristics of fabrics needed for the removal of cellular material from surfaces. DNA quantitation values obtained on dried saliva stains showed no difference between cotton and polyester across all constructions and solvent conditions. Fabrics used dry and with water yielded higher quantitation values than those used with isopropanol. Quantitation values were also higher for wovens and nonwovens than knits across all solvent conditions. Low thread count fabrics used with water yielded higher quantitation values, but no correlation between thread count and quantitation values was observed with dry fabrics. A low thread count woven fabric, however, outperformed other tested fabrics when swabbing object surfaces in a highly used room. Full DNA profiles from fingerprints on glass surfaces were obtained with low thread count woven and nonwoven fabrics but not with the knit fabric tested. © 2011 American Academy of Forensic Sciences.

  1. Sorção de agua em compósitos de poliéster insaturado reforçados com tecido de juta e juta/vidro modelagem, simulação e experimentação Water sorption in unsaturated polyester composites reinforced with jute and jute/glass fiber fabrics: modeling, simulation and experimentation

    Directory of Open Access Journals (Sweden)

    Wilma S. Cavalcanti

    2010-01-01

    , and premature failure of the system. This problem can be reduced by employing hybrid fiber weaved or knitted fabrics. This work is aimed at studying water sorption in composites of jute and jute/glass. The compression molded unsaturated polyester composites reinforced with jute fabric and a hybrid jute-glass fabric had the following weight compositions: a 26% jute/74% unsaturated polyester; and b 26% jute/32% glass roving/42% unsaturated polyester and dimensions of 20.00 × 20.00 × 2.30 mm³ and 20.00 × 20.00 × 2.82 mm³, respectively. A three-dimensional transient diffusion mathematical model was developed to predict mass transfer during water absorption. The mathematical formulation was numerically solved using a finite-volume method and an implicit interpolation scheme. The results of moisture content distribution inside these composites and water absorption kinetics are shown and analyzed. The knowledge of this moisture distribution allows verifying more favorable areas for delamination due to the weakness of the fiber-matrix interface and consequently reduction in the mechanical properties.

  2. Synthetic scaffolds based on biodegradable, functionalized polyesters for tissue engineering applications

    NARCIS (Netherlands)

    Seyednejad, S.H.

    2012-01-01

    The aim of this thesis was to investigate the possibility of using a novel hydroxyl-functionalized polyester [poly(hydroxymethylglycolide-co-ε-caprolactone), pHMGCL] (Fig.9) to fabricate scaffolds for tissue engineering applications. Degradable polymers that are frequently used for tissue engineerin

  3. some tensile properties of unsaturated polyester resin reinforced wi

    African Journals Online (AJOL)

    Dr Obe

    This study investigated the tensile response of polyester composites ... SOME TENSILE PROPERTIES OF UNSATURATED POLYESTER RESIN REINFORCED WITH VARYING VOLUME ... the characterization of the particles and their.

  4. Influence of alkali deweighting of anti-ultraviolet polyester filament fabric on its UV resistant property%碱减量工艺对抗紫外线涤纶长丝织物抗紫外线功能的影响

    Institute of Scientific and Technical Information of China (English)

    段亚峰; 庄小雄; 潘葵; 叶海娜; 陈兰兰

    2009-01-01

    为明确印染前处理工艺对织物抗紫外线功能的影响,以不同抗紫外线功能涤纶长丝织物坯布为原料,经精练一碱减量一定型前处理工艺加工制备试样.通过实验测试,分析织物减量率和抗紫外线效果随印染前处理工艺条件变化的特点,并对不同减量率下织物的抗紫外线性能、透气性、断裂强力、弯曲刚度、厚度和耐磨性等进行分析.结果表明:随着NaOH质量浓度、处理温度和处理浴比的增加,处理时间的延长,抗紫外线效果变弱,织物经向弯曲刚度和厚度减小,透气量增加,织物变得手感柔软,光泽柔和,舒适性改善,但是,经向断裂强力逐渐减小,耐磨性变差;为了获得较佳抗紫外线效果和织物风格,减量率应控制在15%-20%.%For understanding the influence of pretreatment on UV resistant property of fabrics,polyester filament grey fabrics with different ultraviolet protection factors ( UPFs),after going through scouring/alkali deweighting/setting,were used as specimens.The influence of deweighting percentage on UPFs,permeability,breaking strength,bending rigidity,thickness and wearability of the treated fabrics was analyzed through experiment.The results indicated that with the increase of treatment temperature,mass concentration of NaOH,duration time and liquid ratio,UPF of the fabrics is decreased,warpwise bending rigidity,breaking strength,wearability and thickness are also decreased,but permeability,hand feeling,luster and comfortability are improved.The alkali deweighting percentage should be controlled at the range of 15%~20% in order to obtain a fabric with good UPF and style.

  5. Biodegradable polyesters based on succinic acid

    Directory of Open Access Journals (Sweden)

    Nikolić Marija S.

    2003-01-01

    Full Text Available Two series of aliphatic polyesters based on succinic acid were synthesized by copolymerization with adipic acid for the first series of saturated polyesters, and with fumaric acid for the second series. Polyesters were prepared starting from the corresponding dimethyl esters and 1,4-butanediol by melt transesterification in the presence of a highly effective catalyst tetra-n-butyl-titanate, Ti(0Bu4. The molecular structure and composition of the copolyesters was determined by 1H NMR spectroscopy. The effect of copolymer composition on the physical and thermal properties of these random polyesters were investigated using differential scanning calorimetry. The degree of crystallinity was determined by DSC and wide angle X-ray. The degrees of crystallinity of the saturated and unsaturated copolyesters were generally reduced with respect to poly(butylene succinate, PBS. The melting temperatures of the saturated polyesters were lower, while the melting temperatures of the unsaturated copolyesters were higher than the melting temperature of PBS. The biodegradability of the polyesters was investigated by enzymatic degradation tests. The enzymatic degradation tests were performed in a buffer solution with Candida cylindracea lipase and for the unsaturated polyesters with Rhizopus arrhizus lipase. The extent of biodegradation was quantified as the weight loss of polyester films. Also the surface of the polyester films after degradation was observed using optical microscopy. It could be concluded that the biodegradability depended strongly on the degree of crystallinity, but also on the flexibility of the chain backbone. The highest biodegradation was observed for copolyesters containing 50 mol.% of adipic acid units, and in the series of unsaturated polyesters for copolyesters containing 5 and 10 mol.% of fumarate units. Although the degree of crystallinity of the unsaturated polyesters decreased slightly with increasing unsaturation, the biodegradation

  6. Mechanical and Morphological Properties of Nano Filler Polyester Composites

    OpenAIRE

    Bonnia Noor Najmi; Redzuan Aein Afina; Shuhaimeen Nurul Shakirah

    2016-01-01

    This research is focusing on mechanical and morphological properties of unsaturated polyester (UP) reinforced with two different types of filler which is nano size clay Cloisite 30B (C30B) and Carbon Black (CB). Samples were fabricated via hand lay-up and open molding technique. Percentages of Cloisite 30B & Carbon Black (CB) used vary from 0, 2, 4, 6, 8 and 10 wt%. The mechanical properties were evaluated by impact, flexural and hardness testing. Result shows that the mechanical strength of ...

  7. RHEOLOGY OF CONCENTRATED SOLUTIONS OF HYPERBRANCHED POLYESTERS

    Science.gov (United States)

    The solution rheology of different generations of hyperbranched polyesters in N-methyl-2- pyrrolidinone (NMP) solvent was examined in this study. The solutions exhibited Newtonian behavior over a wide range of polyester concentrations. Also, the relative viscosities of poly(amido...

  8. Polyester Dendrimers: Smart Carriers for Drug Delivery

    Directory of Open Access Journals (Sweden)

    Jean–d’Amour K. Twibanire

    2014-01-01

    Full Text Available Polyester dendrimers have been shown to be outstanding candidates for biomedical applications. Compared to traditional polymeric drug vehicles, these biodegradable dendrimers show excellent advantages especially as drug delivery systems because they are non-toxic. Here, advances on polyester dendrimers as smart carriers for drug delivery applications have been surveyed. Both covalent and non-covalent incorporation of drugs are discussed.

  9. RHEOLOGY OF CONCENTRATED SOLUTIONS OF HYPERBRANCHED POLYESTERS

    Science.gov (United States)

    The solution rheology of different generations of hyperbranched polyesters in N-methyl-2- pyrrolidinone (NMP) solvent was examined in this study. The solutions exhibited Newtonian behavior over a wide range of polyester concentrations. Also, the relative viscosities of poly(amido...

  10. Biocatalytic synthesis of silicone polyesters.

    Science.gov (United States)

    Frampton, Mark B; Subczynska, Izabela; Zelisko, Paul M

    2010-07-12

    The immobilized lipase B from Candida antarctica (CALB) was used to synthesize silicone polyesters. CALB routinely generated between 74-95% polytransesterification depending on the monomers that were used. Low molecular weight diols resulted in the highest rates of esterification. Rate constants were determined for the CALB catalyzed polytransesterifications at various reaction temperatures. The temperature dependence of the CALB-mediated polytransesterifications was examined. A lipase from C. rugosa was only successful in performing esterifications using carboxy-modified silicones that possessed alkyl chains greater than three methylene units between the carbonyl and the dimethylsiloxy groups. The proteases alpha-chymotrypsin and papain were not suitable enzymes for catalyzing any polytransesterification reactions.

  11. Castor Oil-Based Biodegradable Polyesters.

    Science.gov (United States)

    Kunduru, Konda Reddy; Basu, Arijit; Haim Zada, Moran; Domb, Abraham J

    2015-09-14

    This Review compiles the synthesis, physical properties, and biomedical applications for the polyesters based on castor oil and ricinoleic acid. Castor oil has been known for its medicinal value since ancient times. It contains ∼90% ricinoleic acid, which enables direct chemical transformation into polyesters without interference of other fatty acids. The presence of ricinoleic acid (hydroxyl containing fatty acid) enables synthesis of various polyester/anhydrides. In addition, castor oil contains a cis-double bond that can be hydrogenated, oxidized, halogenated, and polymerized. Castor oil is obtained pure in large quantities from natural sources; it is safe and biocompatible.

  12. Recent Advances in the Design of Water Based-Flame Retardant Coatings for Polyester and Polyester-Cotton Blends

    Directory of Open Access Journals (Sweden)

    Jenny Alongi

    2016-10-01

    Full Text Available Over the last ten years a new trend of research activities regarding the flame retardancy of polymeric materials has arisen. Indeed, the continuous search for new flame retardant systems able to replace the traditional approaches has encouraged alternative solutions, mainly centred on nanotechnology. In this context, the deposition of nanostructured coatings on fabrics appears to be the most appealing and performance suitable approach. To this aim, different strategies can be exploited: from the deposition of a single monolayer consisting of inorganic nanoparticles (single-step adsorption to the building-up of more complex architectures derived from layer by layer assembly (multi-step adsorption. The present paper aims to review the application of such systems in the field of polyester and polyester-cotton blend fabrics. The results collated by the authors are discussed and compared with those published in the literature on the basis of the different deposition methods adopted. A critical analysis of the advantages and disadvantages exhibited by these approaches is also presented.

  13. Dynamic solid phase DNA extraction and PCR amplification in polyester-toner based microchip.

    Science.gov (United States)

    Duarte, Gabriela R M; Price, Carol W; Augustine, Brian H; Carrilho, Emanuel; Landers, James P

    2011-07-01

    A variety of substrates have been used for fabrication of microchips for DNA extraction, PCR amplification, and DNA fragment separation, including the more conventional glass and silicon as well as alternative polymer-based materials. Polyester represents one such polymer, and the laser-printing of toner onto polyester films has been shown to be effective for generating polyester-toner (PeT) microfluidic devices with channel depths on the order of tens of micrometers. Here, we describe a novel and simple process that allows for the production of multilayer, high aspect-ratio PeT microdevices with substantially larger channel depths. This innovative process utilizes a CO(2) laser to create the microchannel in polyester sheets containing a uniform layer of printed toner, and multilayer devices can easily be constructed by sandwiching the channel layer between uncoated cover sheets of polyester containing precut access holes. The process allows the fabrication of deep channels, with ~270 μm, and we demonstrate the effectiveness of multilayer PeT microchips for dynamic solid phase extraction (dSPE) and PCR amplification. With the former, we found that (i) more than 65% of DNA from 0.6 μL of blood was recovered, (ii) the resultant DNA was concentrated to greater than 3 ng/μL (which was better than other chip-based extraction methods), and (iii) the DNA recovered was compatible with downstream microchip-based PCR amplification. Illustrative of the compatibility of PeT microchips with the PCR process, the successful amplification of a 520 bp fragment of λ-phage DNA in a conventional thermocycler is shown. The ability to handle the diverse chemistries associated with DNA purification and extraction is a testimony to the potential utility of PeT microchips beyond separations and presents a promising new disposable platform for genetic analysis that is low cost and easy to fabricate.

  14. Dot-ELISA-IgM in saliva for the diagnosis of human leptospirosis using polyester fabric-resin as support (Preliminary Report Dot-ELISA-IgM em saliva para diagnóstico da leptospirose humana, empregando como suporte tecido de poliéster-resina (Nota Prévia

    Directory of Open Access Journals (Sweden)

    Marcos Vinicius da Silva

    1994-10-01

    Full Text Available In order to improve the diagnosis of human leptospirosis, we standardized the dot-ELISA for the search of specific IgM antibodies in saliva. Saliva and serum samples were collected simultaneously from 20 patients with the icterohemorrhagic form of the disease, from 10 patients with other pathologies and from 5 negative controls. Leptospires of serovars icterohaemorrhagiae, canicola, hebdomadis, brasiliensis and cynopteri grown in EMJH medium and mixed together in equal volumes, were used as antigen at individual protein concentration of 0.2 µg/µl. In the solid phase of the test we used polyester fabric impregnated with N-methylolacrylamide resin. The antigen volume for each test was 1µl, the saliva volume was 8 µl, and the volume of peroxidase-labelled anti-human IgM conjugate was 30 µl. A visual reading was taken after development in freshly prepared chromogen solution. In contrast to the classic nitrocellulose membrane support, the fabric support is easy to obtain and to handle. Saliva can be collected directly onto the support, a fact that facilitates the method and reduces the expenses and risks related to blood processing.Com a finalidade de melhorar o diagnóstico da leptospirose humana, padronizou-se o teste dot-ELISA para a pesquisa de anticorpos específicos da classe IgM na saliva. Empregaram-se amostras de saliva e soro coletadas simultaneamente de 20 pacientes com a forma ictero-hemorrágica da doença, de 10 pacientes com outras patologias e 5 controles negativos. Culturas de Leptos-pira em meio EMJH, dos sorovares: icterohaemorrhagiae, canicola, hebdomadis, brasiliensis e cynopteri, foram utilizadas como antígeno, na concentração proteica individual de 0,2 µg/µl, misturadas em volumes iguais. Na fase sólida do teste empregou-se tecido de po-liéster impregnado com resina de N-metilol-acrilamida. O volume do antígeno para cada teste foi de 1µl, o de saliva 8µl, o de conjugado anti-IgM humana marcada com peroxidase, de

  15. ENVIRONMENTAL TECHNOLOGY VERIFICATION REPORT: BAGHOUSE FILTRATION PRODUCTS, BWF AMERICA, INC., GRADE 700 MPS POLYESTER FELT FILTER SAMPLE

    Science.gov (United States)

    EPA's National Risk Management Research Laboratory, through its Environmental Technology Verification Program, evaluated the performance of a bag house filtration product for use controlling PM2.5. The product was BWF America, Inc., filter fabric Grade 700 Polyester Felt. All tes...

  16. ENVIRONMENTAL TECHNOLOGY VERIFICATION REPORT: BAGHOUSE FILTRATION PRODUCTS, BWF AMERICA, INC., GRADE 700 MPS POLYESTER FELT FILTER SAMPLE

    Science.gov (United States)

    EPA's National Risk Management Research Laboratory, through its Environmental Technology Verification Program, evaluated the performance of a bag house filtration product for use controlling PM2.5. The product was BWF America, Inc., filter fabric Grade 700 Polyester Felt. All tes...

  17. One-pot preparation of unsaturated polyester nanocomposites containing functionalized graphene sheets via a novel solvent-exchange method

    Science.gov (United States)

    This paper reports a convenient one-pot method integrating a novel solvent-exchange method into in situ melt polycondensation to fabricate unsaturated polyester nanocomposites containing functionalized graphene sheets (FGS). A novel solvent-exchange method was first developed to prepare graphene oxi...

  18. Micropatterned coumarin polyester thin films direct neurite orientation.

    Science.gov (United States)

    McCormick, Aleesha M; Maddipatla, Murthy V S N; Shi, Shuojia; Chamsaz, Elaheh A; Yokoyama, Hiroshi; Joy, Abraham; Leipzig, Nic D

    2014-11-26

    Guidance and migration of cells in the nervous system is imperative for proper development, maturation, and regeneration. In the peripheral nervous system (PNS), it is challenging for axons to bridge critical-sized injury defects to achieve repair and the central nervous system (CNS) has a very limited ability to regenerate after injury because of its innate injury response. The photoreactivity of the coumarin polyester used in this study enables efficient micropatterning using a custom digital micromirror device (DMD) and has been previously shown to be biodegradable, making these thin films ideal for cell guidance substrates with potential for future in vivo applications. With DMD, we fabricated coumarin polyester thin films into 10×20 μm and 15×50 μm micropatterns with depths ranging from 15 to 20 nm to enhance nervous system cell alignment. Adult primary neurons, oligodendrocytes, and astrocytes were isolated from rat brain tissue and seeded onto the polymer surfaces. After 24 h, cell type and neurite alignment were analyzed using phase contrast and fluorescence imaging. There was a significant difference (ppolyester thin films has proven beneficial as an axon guidance platform for future nervous system regenerative strategies.

  19. MICROWAVE RADIATIONS FOR HEAT-SETTING OF POLYESTER FIBERS

    Directory of Open Access Journals (Sweden)

    Ajit V.Gore

    2009-12-01

    Full Text Available The use of radio and microwave frequency is gainingimportance for industrial applications such asheating, drying, and other processing. The mostimportant advantage of using microwave is that it isnon-contact or localized heating and the heat isproduced within the material. This can be much moreeffective than indirect heating where the heatpropagation is by heat conduction through thematerial. We have been investigating the influence ofmicrowave radiation on different fibers for the lastfew years. In the present investigation we usedmicrowave frequency of 2450 MHz to investigate itseffect on polyester fibers. The polyester fibers wereheat set in air as well as a liquid, which acted as alossy substances. The liquid was chosen on the basisof earlier experiments, which showed the maximumeffect. A comparative study was also carried outusing conventional heating in silicone oil.Using the method of X-ray Diffraction (XRD wecalculated the changes in % crystallinity andorientation. It was found that as the time of treatmentunder microwave radiation increased from 15 sec. to120 sec. the order factor was found to increase from0.32 to 0.71.The crystalline orientation as determinedfrom the azimuthal scan was also found to increase.Such structural changes can be highly beneficial forthe processing of fabric in industry. The microwaveradiation process is fast, reliable and energy saving.

  20. The Mechanical Properties of Castor Seed Shell-polyester Matrix Composites

    OpenAIRE

    S.C. Nwigbo; T.C. Okafor; C.U. Atuanya

    2013-01-01

    A composite with a polyester matrix reinforced with chemically modified shells of castor seed (Ricinus communis) was produced. The effect of the shell (filler) on the mechanical properties of the composite was experimentally quantified. A preliminary study was earlier carried out the shell in terms of their chemical constituents, functional group and mechanical strength. The shell was ground and chemically treated to enhance good bonding and adhesion to the matrix. Composites were fabricated ...

  1. Microbial odor profile of polyester and cotton clothes after a fitness session.

    Science.gov (United States)

    Callewaert, Chris; De Maeseneire, Evelyn; Kerckhof, Frederiek-Maarten; Verliefde, Arne; Van de Wiele, Tom; Boon, Nico

    2014-11-01

    Clothing textiles protect our human body against external factors. These textiles are not sterile and can harbor high bacterial counts as sweat and bacteria are transmitted from the skin. We investigated the microbial growth and odor development in cotton and synthetic clothing fabrics. T-shirts were collected from 26 healthy individuals after an intensive bicycle spinning session and incubated for 28 h before analysis. A trained odor panel determined significant differences between polyester versus cotton fabrics for the hedonic value, the intensity, and five qualitative odor characteristics. The polyester T-shirts smelled significantly less pleasant and more intense, compared to the cotton T-shirts. A dissimilar bacterial growth was found in cotton versus synthetic clothing textiles. Micrococci were isolated in almost all synthetic shirts and were detected almost solely on synthetic shirts by means of denaturing gradient gel electrophoresis fingerprinting. A selective enrichment of micrococci in an in vitro growth experiment confirmed the presence of these species on polyester. Staphylococci were abundant on both cotton and synthetic fabrics. Corynebacteria were not enriched on any textile type. This research found that the composition of clothing fibers promotes differential growth of textile microbes and, as such, determines possible malodor generation.

  2. Synthetic polyester from algae oil.

    Science.gov (United States)

    Roesle, Philipp; Stempfle, Florian; Hess, Sandra K; Zimmerer, Julia; Río Bártulos, Carolina; Lepetit, Bernard; Eckert, Angelika; Kroth, Peter G; Mecking, Stefan

    2014-06-23

    Current efforts to technically use microalgae focus on the generation of fuels with a molecular structure identical to crude oil based products. Here we suggest a different approach for the utilization of algae by translating the unique molecular structures of algae oil fatty acids into higher value chemical intermediates and materials. A crude extract from a microalga, the diatom Phaeodactylum tricornutum, was obtained as a multicomponent mixture containing amongst others unsaturated fatty acid (16:1, 18:1, and 20:5) phosphocholine triglycerides. Exposure of this crude algae oil to CO and methanol with the known catalyst precursor [{1,2-(tBu2 PCH2)2C6H4}Pd(OTf)](OTf) resulted in isomerization/methoxycarbonylation of the unsaturated fatty acids into a mixture of linear 1,17- and 1,19-diesters in high purity (>99 %). Polycondensation with a mixture of the corresponding diols yielded a novel mixed polyester-17/19.17/19 with an advantageously high melting and crystallization temperature.

  3. ADVANCES IN LIQUID CRYSTALLINE POLYESTERS

    Institute of Scientific and Technical Information of China (English)

    W. J. Jackson

    1992-01-01

    Advances have been made in understanding the interactions of composition, molecular weight,liquid crystallinity, orientation, and three-dimensional crystallinity on the properties of injection-molded and melt-spun liquid crystalline polyesters (LCP's). Two classes of potentially low-cost LCP's were compared : (1) semiflexible LCP's prepared from 1,6-hexanediol and the dimethyl ester of either trans-4, 4'-stilbenedicarboxylic acid or 4.4 ′-biphenyldicarboxylic acid and (2) all-aromatic LCP's prepared from terephthalic acid, 2, 6-naphthalenedicarboxylic acid, the diacetate of hydroquinone,and the acetate of p-hydroxybenzoic acid. The effects of composition on the plastic properties of the 4-component all-aromatic LCP's were determined with the aid of a 3 × 3 factorial statistically designed experiment, the generation of equations with a computer program, and the plotting of three-dimensional figures and contour diagrams. The effects of absolute molecular weight (Mw) on the tensile strengths of the semiflexible LCP's and one of the all-aromatic LCP's having an excellent balance of plastic properties were also compared, and it was observed that the semiflexible LCP's required Mw's about 4 times higher than the all-aromatic LCP to attain a given strength. Persistence lengths and molecular modeling were used to explain these differences.

  4. A solvent induced crystallisation method to imbue bioactive ingredients of neem oil into the compact structure of poly (ethylene terephthalate) polyester.

    Science.gov (United States)

    Ali, Wazed; Sultana, Parveen; Joshi, Mangala; Rajendran, Subbiyan

    2016-07-01

    Neem oil, a natural antibacterial agent from neem tree (Azadarichtaindica) has been used to impart antibacterial activity to polyester fabrics. Solvent induced polymer modification method was used and that facilitated the easy entry of neem molecules into the compact structure of polyethylene terephthalate (PET) polyester. The polyester fabric was treated with trichloroacetic acid-methylene chloride (TCAMC) solvent system at room temperature prior to treatment with neem oil. The concentration of TCAMC and the treatment time were optimised. XRD and SEM results showed that the TCAMC treatment causes polymer modification and morphological changes in the PET polyester. Antibacterial activity of TCAMC pre-treated and neem-oil-treated polyester fabric was tested using AATCC qualitative and quantitative methods. Both Gram-positive and Gram-negative organisms were used to determine the antimicrobial activity. It was observed that the treated fabric registers substantial antimicrobial activity against both the Staphylococcus aureus (Gram-positive) and the Escherichia coli (Gram-negative) and the effect increases with the increase in concentration of TCAMC treatment. The antibacterial effect remains substantial even after 25 launderings. A kinetic growth study involving the effect of antibacterial activity at various incubation times was carried out. Copyright © 2016 Elsevier B.V. All rights reserved.

  5. 77 FR 60720 - Certain Polyester Staple Fiber From China

    Science.gov (United States)

    2012-10-04

    ... COMMISSION Certain Polyester Staple Fiber From China Determination On the basis of the record \\1\\ developed... antidumping duty order on certain polyester staple fiber from China would be likely to lead to continuation or... USITC Publication 4351 (September 2012), entitled Certain Polyester Staple Fiber from...

  6. Rewritable azobenzene polyester for polarization holographic data storage

    DEFF Research Database (Denmark)

    Kerekes, A; Sajti, Sz.; Loerincz, Emoeke;

    2000-01-01

    Optical storage properties of thin azobenzene side-chain polyester films were examined by polarization holographic measurements. The new amorphous polyester film is the candidate material for the purpose of rewritable holographic memory system. Temporal formation of anisotropic and topographic...... and erasing was tested. The ability of azobenzene polyester for rewriting was found satisfactory after many writing-erasing cycles....

  7. 40 CFR 721.8082 - Polyester polyurethane acrylate.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 30 2010-07-01 2010-07-01 false Polyester polyurethane acrylate. 721... Substances § 721.8082 Polyester polyurethane acrylate. (a) Chemical substance and significant new uses subject to reporting. (1) The chemical substance identified generically as polyester polyurethane...

  8. COLOR MEASUREMENT DATABASE OF THE SINGLE-COLORANT DISPERSE DYES PRINTING AND ITS APPLICATION IN POLYESTER FABRIC PRINTING%分散染料单色浆印花测色数据库及其在印花配色中的应用

    Institute of Scientific and Technical Information of China (English)

    施千千; 卯玉琼

    2014-01-01

    With the improvement of computer color testing technology, the application of this technology has gradually been accepted in textile color measurement, including the mature application of color characterization during the textile dyeing process and the dyeing recipe control. However, because of the particularity of textile printing products, it has not been popular due to the uncertainty of computer color measurement and matching application. Based on the polyester fabric with disperse dye color paste printing textile color measurement data, this paper tries to establish the printing color measurement database, probes the color consistency of the color paste formula corresponding to the color data in color space and actual printing textile. Meanwhile, this paper researches on the establishment of disperse dye color paste printing database and the application of corresponding formula, which guides the practical printing.%随着计算机颜色测试技术的不断提高,其在纺织品颜色测量领域中应用越来越大并逐渐得到人们的认可,包括纺织品染色过程中颜色的表征以及染色配方的控制都有成熟的应用。但是,由于纺织品印花产品的特殊性,其对于计算机测色配色的应用存在较多的不确定性而没有得到较多的应用。本文基于了涤纶织物分散染料的单色浆印花测色数据为基础建立印花测色数据库,探讨了根据色空间中的颜色数据所对应的色浆配方与实际印花纺织品颜色的一致性,同时研究分散染料单色浆印花数据库的建立及其对应配方的应用,对实际印花具有指导作用。

  9. Bioremediation of pesticide contaminated water using an organophosphate degrading enzyme immobilized on nonwoven polyester textiles.

    Science.gov (United States)

    Gao, Yuan; Truong, Yen Bach; Cacioli, Paul; Butler, Phil; Kyratzis, Ilias Louis

    2014-01-10

    Bioremediation using enzymes has become an attractive approach for removing hazardous chemicals such as organophosphate pesticides from the environment. Enzymes immobilized on solid carriers are particularly suited for such applications. In this study, the organophosphate degrading enzyme A (OpdA) was covalently immobilized on highly porous nonwoven polyester fabrics for organophosphate pesticide degradation. The fabrics were first activated with ethylenediamine to introduce free amine groups, and the enzyme was then attached using the bifunctional crosslinker glutaraldehyde. The immobilization only slightly increased the Km (for methyl parathion, MP), broadened the pH profile such that the enzyme had significant activity at acidic pH, and enhanced the stability of the enzyme. The OpdA-functionalized fabrics could be stored in a phosphate buffer or in the dry state at 4°C for at least 4 weeks without a large loss of activity. When used in batch mode, the functionalized textiles could degrade 20 μM MP in un-buffered water at liquor to fabric ratios as high as 5000:1 within 2h, and could be used repeatedly. The fabrics could also be made into columns for continuous pesticide degradation. The columns were able to degrade 50 μM MP at high flow rates, and could be used repeatedly over 2 months. These results demonstrate that OpdA immobilized on nonwoven polyester fabrics is useful in environmental remediation of organophosphate compounds.

  10. UV curable hard coatings on polyesters

    Science.gov (United States)

    Datashvili, Tea; Brostow, Witold; Kao, David

    2006-10-01

    UV curable, hard and transparent hybrid inorganic-organic coatings with covalent links between the inorganic and the organic networks were prepared using organically crosslinked heteropolysiloxanes based on the sol-gel process. The materials were applied onto polyester sheets and UV cured. The deposition was followed by a thermal treatment to improve mechanical properties of the coatings. High light transmission and the resulting thermophysical properties indicate the presence of a nanoscale hybrid composition. The coatings show excellent adhesion to polyesters even without using primers. Further mechanical characterization shows that the coatings provide high hardness and good abrasion resistance.

  11. Preparation and application of aqueous organosilicon-modified polyester resin%水性有机硅改性聚酯树脂的合成与应用

    Institute of Scientific and Technical Information of China (English)

    张丽丽; 曾敬荣; 江俊鸿; 杨雁; 俞金柱

    2013-01-01

    In this paper, hydroxy polyester resins were synthesized through melting. In this process, anti-monous oxide was used as catalyst and 10%, 30% and 50% of organosilicon intermediate was used to chemical modification respectively. The modified organosilicon polyester resin with trimellitic anhydride was processed with water base-side processing,then salted with dimethylethanolamine. This kind of water-soluble organosilicon modified polyester resin treated with this way was used to cure and film with amino resin, which performs excellent high temperature resistant, high solidity and excellent flexibility. The experiment results showed that the compositive property and the price performance is the best when the content of organosilicon is 30%.%本文以Sb2O3为催化剂,采用熔融法合成端羟基聚酯树脂,分别以10%、30%、50%的有机硅中间体进行化学改性,以偏苯三甲酸酐对有机硅改性后的聚酯进行了水性化封端,并采用二甲基乙醇胺成盐,制备的水性有机硅改性聚酯树脂配以氨基树脂固化成膜后,表现出具有优良耐高温性、高硬度、良好柔韧性等性能,实验表明,当有机硅含量为30%时,改性聚酯树脂树脂的综合性能和性价比最好.

  12. Antimicrobial wool, polyester and a wool/polyester blend created by silver particles embedded in a silica matrix.

    Science.gov (United States)

    Klemenčič, Danijela; Tomšič, Brigita; Kovač, Franci; Žerjav, Metka; Simončič, Andrej; Simončič, Barbara

    2013-11-01

    A two-step antimicrobial finishing procedure was applied to wool (WO) and polyester (PES) fabrics and a WO/PES fabric blend, in which the pad-dry-cure method was performed to create a functional silica matrix through the application of an inorganic-organic hybrid sol-gel precursor (RB) followed by the in situ synthesis of AgCl particles on the RB-treated fibres using 0.10 and 0.50mM AgNO3 and NaCl. The bulk concentration of Ag on the cotton fibres was determined by inductively coupled plasma mass spectroscopy. The antimicrobial activity was determined for the bacteria Escherichia coli and Staphylococcus aureus, and the fungus Aspergillus niger. The results showed that the highest concentration of the adsorbed Ag compound particles was on the WO samples followed by the WO/PES and PES samples. The antimicrobial activity of the finished fabric samples strongly depended not only on the amount of adsorbed Ag but also on the properties of the fabric samples. Whereas Ag biocidal activity was generated for the finished PES samples at Ag particle concentrations of less than 10mg/kg, the 34-times higher Ag particle concentration on the WO samples was insufficient to impart satisfactory antimicrobial activity because Ag chemically binds to the thiol groups on wool. The presence of wool fibres in WO/PES samples decreased the antimicrobial protection of the fabric blend compared with that of the PES fabric. A lethal concentration of adsorbed Ag compound particles for bacteria and fungi was produced only through the treatment of the WO and WO/PES samples with 0.5mM AgNO3.

  13. Polyether/Polyester Graft Copolymers

    Science.gov (United States)

    Bell, Vernon L., Jr.; Wakelyn, N.; Stoakley, D. M.; Proctor, K. M.

    1986-01-01

    Higher solvent resistance achieved along with lower melting temperature. New technique provides method of preparing copolymers with polypivalolactone segments grafted onto poly (2,6-dimethyl-phenylene oxide) backbone. Process makes strong materials with improved solvent resistance and crystalline, thermally-reversible crosslinks. Resulting graft copolymers easier to fabricate into useful articles, including thin films, sheets, fibers, foams, laminates, and moldings.

  14. Micro-thermal analysis of polyester coatings

    NARCIS (Netherlands)

    Fischer, H.R.

    2010-01-01

    The application and suitability of micro-thermal analysis to detect changes in the chemical and physical properties of coating due to ageing and especially photo-degradation is demonstrated using a model polyester coating based on neopentyl glycol isophthalic acid. The changes in chemical structure

  15. Holographic recording in thiophene-based polyester

    DEFF Research Database (Denmark)

    Matharu, Avtar Singh; Chambers-Asman, David; Jeeva, Shehzad

    2008-01-01

    The synthesis and optical data storage properties of a side-chain thiophene-phenyl azopolyester ThPhAzoP.ol is reported. The polyester is derived from diphenyl tetradecanedioate and a thiophenebased liquid crystalline diol which exhibits a short-lived enantiotropic SmA phase (Cryst 177.7 SmA 180...

  16. Micro-thermal analysis of polyester coatings

    NARCIS (Netherlands)

    Fischer, H.R.

    2010-01-01

    The application and suitability of micro-thermal analysis to detect changes in the chemical and physical properties of coating due to ageing and especially photo-degradation is demonstrated using a model polyester coating based on neopentyl glycol isophthalic acid. The changes in chemical structure

  17. Photoinduced Deformation of Azobenzene Polyester Films

    DEFF Research Database (Denmark)

    Bublitz, D.; Helgert, M.; Fleck, B.;

    2000-01-01

    We investigate two types of azobenzene side-chain polyesters which have shown opposite behaviour in light-induced surface grating formation experiments. Thin films of these polymers prepared on a water surface undergo opposite changes of shape under the influence of polarized light. We propose...

  18. Carboxylated Polyurethanes Containing Hyperbranched Polyester Soft Segments

    Directory of Open Access Journals (Sweden)

    Žigon, M.

    2006-09-01

    Full Text Available hyperbranched polyester soft segments (HB PU with functional carboxylic groups in order to enable the preparation of stable HB PU dispersions. Carboxylated hyperbranched polyurethanes were synthesized using a hyperbranched polyester based on 2,2-bis(methylolpropionic acid of the fourth pseudo-generation (Boltorn H40 and hexamethylene (HDI or isophorone diisocyanate (IPDI. The reactivity of hyperbranched polyester with HDI was lower than expected, possibly due to the presence of less reactive hydroxyl groups in the linear repeat units. A gel was formed at mole ratios rNCO/OH = 1:2 or 1:4. The synthesis of HB PU was performed with partly esterified hyperbranched polyester with lowered hydroxyl functionality. The carboxyl groups were incorporated in the HB PU backbone by reaction of residual hydroxyl groups with cis-1,2-cyclohexanedicarboxylic anhydride. HB PU aqueous dispersions were stable at least for two months, although their films were brittle. The tensile strength and Young's modulus of blends of linear and HB PU decreased with increasing content of HB PU whereas elongation at break remained nearly constant, which was explained in terms of looser chain packing due to more open tree-like hyperbranched structures.

  19. Correlation spectroscopy applied to glycerol polyester spectra

    Science.gov (United States)

    The recent development of glycerol polyesters for use as controlled release matrix materials in the nutraceuticals and pharmaceuticals industries presented a unique opportunity to apply correlation spectroscopy. In a typical formulation the glycerol is reacted with a polyfunctional acid such as citr...

  20. The Mechanical Properties of Castor Seed Shell-polyester Matrix Composites

    Directory of Open Access Journals (Sweden)

    S.C. Nwigbo

    2013-05-01

    Full Text Available A composite with a polyester matrix reinforced with chemically modified shells of castor seed (Ricinus communis was produced. The effect of the shell (filler on the mechanical properties of the composite was experimentally quantified. A preliminary study was earlier carried out the shell in terms of their chemical constituents, functional group and mechanical strength. The shell was ground and chemically treated to enhance good bonding and adhesion to the matrix. Composites were fabricated using a hand lay-up or contact mould method for different percentage compositions of the filler. Tests, with respect to the mechanical properties (i.e., tensile, flexural and creep response were carried out. The result obtained was compared with the unreinforced polyester plate. It was observed that the inclusion of the filler (shell added strength to the composite. Scanning Electron Microscopy (SEM was taken on the composite samples to study the morphology of the composites.

  1. FINISHING FABRICATED METAL PRODUCTS WITH ...

    Science.gov (United States)

    This report provides a technical and economic evaluation of a polyester powder coating system applied to the exterior and interior surfaces of metal boxes fabricated for the telephone and cable industries. This evaluation summarized many of the requirements and benefits of a clean technology that effectively eliminates the use of hazardous solvents and prevents the generation of volatile organic emissions and hazardous solid waste. publish information

  2. Reduced toxicity polyester resins and microvascular pre-preg tapes for advanced composites manufacturing

    Science.gov (United States)

    Poillucci, Richard

    Advanced composites manufacturing broadly encapsulates topics ranging from matrix chemistries to automated machines that lay-up fiber-reinforced materials. Environmental regulations are stimulating research to reduce matrix resin formulation toxicity. At present, composites fabricated with polyester resins expose workers to the risk of contact with and inhalation of styrene monomer, which is a potential carcinogen, neurotoxin, and respiratory irritant. The first primary goal of this thesis is to reduce the toxicity associated with polyester resins by: (1) identification of potential monomers to replace styrene, (2) determination of monomer solubility within the polyester, and (3) investigation of approaches to rapidly screen a large resin composition parameter space. Monomers are identified based on their ability to react with polyester and their toxicity as determined by the Globally Harmonized System (GHS) and a green screen method. Solubilities were determined by the Hoftyzer -- Van Krevelen method, Hansen solubility parameter database, and experimental mixing of monomers. A combinatorial microfluidic mixing device is designed and tested to obtain distinct resin compositions from two input chemistries. The push for safer materials is complemented by a thrust for multifunctional composites. The second primary goal of this thesis is to design and implement the manufacture of sacrificial fiber materials suitable for use in automated fiber placement of microvascaular multifunctional composites. Two key advancements are required to achieve this goal: (1) development of a roll-to-roll method to place sacrificial fibers onto carbon fiber pre-preg tape; and (2) demonstration of feasible manufacture of microvascular carbon fiber plates with automated fiber placement. An automated method for placing sacrificial fibers onto carbon fiber tapes is designed and a prototype implemented. Carbon fiber tows with manual placement of sacrificial fibers is implemented within an

  3. Nanoprecipitation and Spectroscopic Characterization of Curcumin-Encapsulated Polyester Nanoparticles.

    Science.gov (United States)

    Leung, Mandy H M; Harada, Takaaki; Dai, Sheng; Kee, Tak W

    2015-10-27

    Curcumin-encapsulated polyester nanoparticles (Cur-polyester NPs) of approximately 100 nm diameter with a negatively charged surface were prepared using a one-step nanoprecipitation method. The Cur-polyester NPs were prepared using polylactic acid, poly(D,L-lactic-co-glycolic acid) and poly(ϵ-caprolactone) without any emulsifier or surfactant. The encapsulation of curcumin in these polyester NPs greatly suppresses curcumin degradation in the aqueous environment due to its segregation from water. In addition, the fluorescence of curcumin in polyester NPs has a quantum yield of 4 to 5%, which is higher than that of curcumin in micellar systems and comparable to those in organic solvents, further supporting the idea that the polyester NPs are capable of excluding water from curcumin. Furthermore, the results from femtosecond fluorescence upconversion spectroscopy reveal that there is a decrease in the signal amplitude corresponding to solvent reorganization of excited state curcumin in the polyester NPs compared with curcumin in micellar systems. The Cur-polyester NPs also show a lack of deuterium isotope effect in the fluorescence lifetime. These results indicate that the interaction between curcumin and water in the polyester NPs is significantly weaker than that in micelles. Therefore, the aqueous stability of curcumin is greatly improved due to highly effective segregation from water. The overall outcome suggests that the polyester NPs prepared using the method reported herein are an attractive system for encapsulating and stabilizing curcumin in the aqueous environment.

  4. A solvent induced crystallisation method to imbue bioactive ingredients of neem oil into the compact structure of poly (ethylene terephthalate) polyester

    Energy Technology Data Exchange (ETDEWEB)

    Ali, Wazed [Department of Textile Technology, Indian Institute of Technology, Hauz Khas, New Delhi 110016 (India); Sultana, Parveen [Department of Physics, Jadavpur University, Kolkata 700032 (India); Joshi, Mangala [Department of Textile Technology, Indian Institute of Technology, Hauz Khas, New Delhi 110016 (India); Rajendran, Subbiyan, E-mail: sr2@bolton.ac.uk [Institute for Materials Research and Innovation, The University of Bolton, Bolton BL3 5AB (United Kingdom)

    2016-07-01

    Neem oil, a natural antibacterial agent from neem tree (Azadarichtaindica) has been used to impart antibacterial activity to polyester fabrics. Solvent induced polymer modification method was used and that facilitated the easy entry of neem molecules into the compact structure of polyethylene terephthalate (PET) polyester. The polyester fabric was treated with trichloroacetic acid-methylene chloride (TCAMC) solvent system at room temperature prior to treatment with neem oil. The concentration of TCAMC and the treatment time were optimised. XRD and SEM results showed that the TCAMC treatment causes polymer modification and morphological changes in the PET polyester. Antibacterial activity of TCAMC pre-treated and neem-oil-treated polyester fabric was tested using AATCC qualitative and quantitative methods. Both Gram-positive and Gram-negative organisms were used to determine the antimicrobial activity. It was observed that the treated fabric registers substantial antimicrobial activity against both the Staphylococcus aureus (Gram-positive) and the Escherichia coli (Gram-negative) and the effect increases with the increase in concentration of TCAMC treatment. The antibacterial effect remains substantial even after 25 launderings. A kinetic growth study involving the effect of antibacterial activity at various incubation times was carried out. - Highlights: • A novel technique whereby the antibacterial components of neem oil are imbued into the compact structure of PET polyester • Trichloroacetic acid-Methylene Chloride treatment facilitated the easy entry of neem ingredients into the PET structure • Neem oil treated PET registered substantial antibacterial efficacy • Antibacterial effect is retained even after multiple use-wash cycles.

  5. Development of Polyester/Eggshell Particulate Composites

    Directory of Open Access Journals (Sweden)

    S.N. Patrick

    2012-12-01

    Full Text Available The development of Polyester/Eggshell particulate composites has been carried out. Uncarbonized and carbonized eggshell particles were used as reinforcement in polyester matrix. 10 to 50 wt% eggshell particles at intervals of 10 wt% were added to polyester as reinforcement. The microstructural analyses of the polyester/eggshell particulate composites were carried out using SEM and EDS. The mechanical properties and density were carried out by standard methods. The results showed that the density and hardness values of the polyester/eggshell particulate composite increased steadily with increasing eggshell addition. The tensile strength increased from 15.182 N/mm2 at 0 wt% eggshell addition to a maximum of 23.4 N/mm2 at 40 wt% eggshell addition for uncarbonized eggshell; while it increased to a maximum of 28.378 N/mm2 at 20 wt% eggshell addition for carbonized eggshell. Compressive strength increased steadily from 90.3 N/mm2 at 0 wt% eggshell additions to a maximum of 103.6 at 50 wt% eggshell addition for uncarbonized eggshell and 116.5N/mm2 at 50 % eggshell addition for carbonized eggshell. Hardness value increased from 91 HRF at 0 % eggshell addition to a maximum of 120.05HRF at 50 wt% eggshell addition for uncarbonized eggshell and 149.45HRF at 50 wt% eggshell for the carbonized eggshell. Flexural strength increased from 76.06 N/mm2 at 0 wt% eggshell addition to a maximum of 97.06 N/mm2 at 40 wt% eggshell addition for uncarbonized eggshell; however, it increased to a maximum of 106.66 N/mm2 at 20 wt% eggshell addition for the carbonized eggshell. The impact energy also increased from 0.1 Joules at 0 wt% eggshell addition to a maximum of 0.35 Joules at 30 wt% eggshell addition for uncarbonized eggshell; it however increased to a maximum of 0.45 Joules at 20 wt% eggshell addition for the carbonized eggshell. Hence the development of polyester/eggshell particulate composites material with good mechanical properties and light weight which is

  6. 75 FR 64694 - Second Antidumping Duty Administrative Review of Certain Polyester Staple Fiber From the People's...

    Science.gov (United States)

    2010-10-20

    ... International Trade Administration Second Antidumping Duty Administrative Review of Certain Polyester Staple... the Preliminary Results of the second administrative review of certain polyester staple fiber (``PSF... Polyester Staple Fiber From the People's Republic of China: Notice of Preliminary Results and...

  7. Thermotropic liquid crystalline polyesters derived from 2-chloro hydroquinone

    Indian Academy of Sciences (India)

    NAGESH MANURKAR; SAYAJI MORE; KHUDBUDIN MULANI; NITIN GANJAVE; NAYAKU CHAVAN

    2017-09-01

    Synthesis of thermotropic liquid crystalline polyesters derived from bis[4-hydroxy benzoyloxy]- 2-chloro-1,4-benzene (BHBOCB) and aliphatic dicarboxylic acid chlorides by interfacial polycondensation methodology is presented. Synthesised polyesters consist of bis[4-hydroxy benzoyloxy]-2-chloro-1,4-benzeneas a mesogen and aliphatic diacid chloride as flexible spacer. The length of oligomethylene units in the polymer was varied from the trimethylene to the dodecamethylene groups. Synthesized polyesters were characterizedby differential scanning calorimetry and optical microscopy. The transition temperatures and thermodynamic properties were studied for all these polymers. These polyesters exhibited thermotropic liquid crystalline behavior and showed nematic texture except decamethylene spacer. Decamethylene spacer based polyester showed marble texture of smectic C. Mesophase stability of these polyesters was higher than 123◦C (except first heating cycle of PE-1).

  8. Moisture Comfort and Antibacterial Properties of Elastic Warp-Knitted Fabrics

    Directory of Open Access Journals (Sweden)

    Yu Zhi-Cai

    2015-03-01

    Full Text Available Multifunction elastic warp-knitted fabrics were fabricated on a crochet machine with the use of metal composite yarns/viscose yarn and bamboo polyester/ crisscross-section polyester hybrid yarns as the front face and back face of the knitted fabric structure, respectively. We investigated the effect of the blend ratio of bamboo charcoal/ crisscross-section polyester multiply yarns on the fabric's moisture comfort properties, such as water vapour transmission (WVT, water evaporation rate (WER, and water absorbency. The results showed that blending ratio significantly influenced WVT and WER. Moreover, antibacterial activity of the elastic warp- knitted fabric was tested against Staphylococcus aureus and Escherichia coli in accordance with AATCC 90-2011. Finally, the extension- stress value curves were used to analyse the elastic stretching property, and the fabric exhibited greater breaking elongation and lower stress value in the walewise than in the weft direction.

  9. Side-chain liquid crystalline polyesters for optical information storage

    DEFF Research Database (Denmark)

    Ramanujam, P.S.; Holme, Christian; Hvilsted, Søren

    1996-01-01

    Azobenzene side-chain liquid crystalline polyester structures suitable for permanent optical storage are described. The synthesis and characterization of the polyesters together with differential scanning calorimetry and X-ray investigations are discussed. Optical anisotropic investigations...... and holographic storage in one particular polyester are described in detail and polarized Fourier transform infrared spectroscopic data complementing the optical data are presented. Optical and atomic force microscope investigations point to a laser-induced aggregation as responsible for permanent optical storage....

  10. Bio-based liquid crystalline polyesters

    Science.gov (United States)

    Wilsens, Carolus; Rastogi, Sanjay; Dutch Collaboration

    2013-03-01

    The reported thin-film polymerization has been used as a screening method in order to find bio-based liquid crystalline polyesters with convenient melting temperatures for melt-processing purposes. An in depth study of the structural, morphological and chemical changes occurring during the ongoing polycondensation reactions of these polymers have been performed. Structural and conformational changes during polymerization for different compositions have been followed by time resolved X-ray and Infrared spectroscopy. In this study, bio-based monomers such as vanillic acid and 2,5-furandicarboxylic acid are successfully incorporated in liquid crystalline polyesters and it is shown that bio-based liquid crystalline polymers with high aromatic content and convenient processing temperatures can be synthesized. Special thanks to the Dutch Polymer Institute for financial support

  11. Thermal stability of aliphatic hyperbranched polyesters

    Directory of Open Access Journals (Sweden)

    Vuković Jasna

    2002-01-01

    Full Text Available The influence of the molar mass (generation, number and type of end groups on the thermal stability of aliphatic hyperbranched polyesters are presented in this study. Different end groups were obtained by modification of the samples with chlorides of propionic acid and stearic acid. The thermal stability of the hyperbranched polyesters was determined by thermogravimetry using a NET-ZSCH TG 209 instrument in nitrogen atmosphere at a heating rate of 10°C/min. A comparison of the temperatures obtained for mass losses of 5 20 and 40 wt% for unmodified samples showed that the thermal stability increased up to the fourth generation and then remained practically constant. An increase in the thermal stability of modified samples of the second, third and fourth generation was observed.

  12. Efficient and Convenient Route for the Synthesis of Some New Antipyrinyl Monoazo Dyes: Application to Polyester Fibers and Biological Evaluation

    Directory of Open Access Journals (Sweden)

    Ahmed A. Fadda

    2013-01-01

    Full Text Available Nine variously substituted azo dye derivatives 2–10 of antipyrine were prepared. The effects of the nature and orientation of the substituents on the color and dyeing properties of these dyes for polyester fibers were evaluated. The newly synthesized compounds were characterized on the basis of elemental analyses and spectral data. On the other hand, the investigated dyes were applied to polyester fabrics and showed good light, washing, heat, and acid perspiration fastness. The remarkable degree of brightness after washings is indicative of the good penetration and the excellent affinity of these dyes for the fabric. The results in general revealed the efficiency of the prepared compounds as new monoazo disperse dyes. The newly synthesized compounds were screened for their antioxidant and cytotoxic activity against Vitamin C and 5-fluorouracil, respectively. The data showed clearly that most of the compounds exhibited good antioxidant and cytotoxic activities.

  13. Novel organometallic aromatic polyester based on ferrocene

    Institute of Scientific and Technical Information of China (English)

    Wei

    2010-01-01

    A novel polyester containing ferrocenyl was prepared by low-temperature interface polycondensation of 1,1'-ferrocenedi-carboxylic acid chloride with 4-(4-hydroxyphenyl)-2,3-phthalazin-l-one(DHPZ), which is a twisted non-coplanar heterocyclic bisphenol-like monomer. The newly generated polymer was evaluated based on characterization of its solubility, viscosity measurements, elemental analysis, FTIR spectroscopy, differential scanning calorimetric and thermogravimetric studies.

  14. Mechanical behavior of polyester-based woven jute/glass hybrid composites

    Science.gov (United States)

    Ahsan, Q.; Tanju, S.

    2012-06-01

    In polymer composite fabrication system, hybridization of jute fibers with synthetic fibers is one of the techniques adopted to overcome some of the limitations (poor mechanical properties and moisture resistance) that have been identified for jute fiber reinforced composites. In the present study, the effect of hybridization on mechanical properties of jute and glass mat reinforced polyester composites has been evaluated experimentally. The composites were made of glass mat, jute mat and varying layers of jute and glass mat in the polyester matrix by applying hand lay-up technique at room temperature (250C). The values of mechanical properties obtained from tensile, flexural and interlaminar shear strength (ILSS) tests show significant improvement with the increase of glass fiber content in hybrid composites. But the positive contribution from glass mat in increasing of ILSS of composite is limited to some extent and the optimum ILSS is achieved when glass-jute incorporated in composite as 50-50 weight basis. SEM images were used to study the modes of fracture, fiber-matrix adhesion, and jute-glass layer adhesion. The fracture surfaces resulted from different tests clearly show that cracks propagate throughout the polyester matrix by tearing the jute mat and delaminating the glass mat.

  15. Biodegradable polyesters reinforced with triclosan loaded polylactide micro/nanofibers: Properties, release and biocompatibility

    Directory of Open Access Journals (Sweden)

    L. J. del Valle

    2012-04-01

    Full Text Available Mechanical properties and drug release behavior were studied for three biodegradable polyester matrices (polycaprolactone, poly(nonamethylene azelate and the copolymer derived from 1,9-nonanediol and an equimolar mixture of azelaic and pimelic acids reinforced with polylactide (PLA fibers. Electrospinning was used to produce suitable mats constituted by fibers of different diameters (i.e. from micro- to nanoscale and a homogeneous dispersion of a representative hydrophobic drug (i.e. triclosan. Fabrics were prepared by a molding process, which allowed cold crystallization of PLA micro/nanofibers and hot crystallization of the polyester matrices. The orientation of PLA molecules during electrospinning favored the crystallization process, which was slightly enhanced when the diameter decreased. Incorporation of PLA micro/nanofibers led to a significant increase in the elastic modulus and tensile strength, and in general to a decrease in the strain at break. The brittle fracture was clearer when high molecular weight samples with high plastic deformation were employed. Large differences in the release behavior were detected depending on the loading process, fiber diameter size and hydrophobicity of the polyester matrix. The release of samples with the drug only loaded into the reinforcing fibers was initially fast and then became slow and sustained, resulting in longer lasting antimicrobial activity. Biocompatibility of all samples studied was demonstrated by adhesion and proliferation assays using HEp-2 cell cultures.

  16. Polyether-polyester graft copolymer

    Science.gov (United States)

    Bell, Vernon L. (Inventor)

    1987-01-01

    Described is a polyether graft polymer having improved solvent resistance and crystalline thermally reversible crosslinks. The copolymer is prepared by a novel process of anionic copolymerization. These polymers exhibit good solvent resistance and are well suited for aircraft parts. Previous aromatic polyethers, also known as polyphenylene oxides, have certain deficiencies which detract from their usefulness. These commercial polymers are often soluble in common solvents including the halocarbon and aromatic hydrocarbon types of paint thinners and removers. This limitation prevents the use of these polyethers in structural articles requiring frequent painting. In addition, the most popular commercially available polyether is a very high melting plastic. This makes it considerably more difficult to fabricate finished parts from this material. These problems are solved by providing an aromatic polyether graft copolymer with improved solvent resistance and crystalline thermally reversible crosslinks. The graft copolymer is formed by converting the carboxyl groups of a carboxylated polyphenylene oxide polymer to ionic carbonyl groups in a suitable solvent, reacting pivalolactone with the dissolved polymer, and adding acid to the solution to produce the graft copolymer.

  17. The Effect Of Weave Construction On Tear Strength Of Woven Fabrics

    Directory of Open Access Journals (Sweden)

    Eryuruk Selin Hanife

    2015-09-01

    Full Text Available The tear strength of a woven fabric is very important, since it is more closely related to serviceability of the fabric. Tearing strength of the fabrics depend on the mobility of the yarn within the fabric structure. In this study, the tearing strength of four types of fabrics warp rib, weft rib, ripstop and plain weave were analysed, which were produced in different densities and with filament and texturised polyester yarns.

  18. Flexural Properties of WeftKnitted Fabric Reinforced Composites

    Institute of Scientific and Technical Information of China (English)

    龙海如; 冯勋伟

    2001-01-01

    Several different kinds of weft knitted fabrics from glass fiber yarns were used as reinforcement to make fabric/polyester composite laminates. Flexural tests were carried out to examine stress- deflection process and compare the mechanical properties in course and wale directions of these composites. The experimental results indicate that the numbers of load-bearing yarn in course and wale direction and the fabric density are the main factors influencing the ultimate tensile strength and initial elastic modulus of specimens.

  19. A biocatalytic approach towards sustainable furanic-aliphatic polyesters

    NARCIS (Netherlands)

    Jiang, Yi; Woortman, Albert J. J.; van Ekenstein, Gert O. R. Alberda; Loos, Katja

    2015-01-01

    An eco-friendly approach towards furanic-aliphatic polyesters as sustainable alternatives to aromatic-aliphatic polyesters is presented. In this approach, biobased dimethyl 2,5-furandicarboxylate (DMFDCA) is polymerized with various (potentially) renewable aliphatic diols via Candida antarctica

  20. 40 CFR 721.6485 - Hydroxy terminated polyester.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 30 2010-07-01 2010-07-01 false Hydroxy terminated polyester. 721.6485... Substances § 721.6485 Hydroxy terminated polyester. (a) Chemical substance and significant new uses subject to reporting. (1) The chemical substance identified generically as a hydroxy terminated...

  1. 75 FR 23300 - Greige Polyester/Cotton Printcloth From China

    Science.gov (United States)

    2010-05-03

    ... COMMISSION Greige Polyester/Cotton Printcloth From China AGENCY: United States International Trade Commission.../cotton printcloth from China. SUMMARY: The Commission hereby gives notice that it has instituted a review... revocation of the antidumping duty order on greige polyester/cotton printcloth from China would be likely...

  2. 75 FR 42784 - Greige Polyester/Cotton Printcloth From China

    Science.gov (United States)

    2010-07-22

    ... COMMISSION Greige Polyester/Cotton Printcloth From China AGENCY: United States International Trade Commission... to determine whether revocation of the antidumping duty order on greige polyester/cotton printcloth from China would be likely to lead to continuation or recurrence of material injury. On July 2,...

  3. Surface modification of polyester biomaterials for tissue engineering.

    Science.gov (United States)

    Jiao, Yan-Peng; Cui, Fu-Zhai

    2007-12-01

    Surfaces play an important role in a biological system for most biological reactions occurring at surfaces and interfaces. The development of biomaterials for tissue engineering is to create perfect surfaces which can provoke specific cellular responses and direct new tissue regeneration. The improvement in biocompatibility of biomaterials for tissue engineering by directed surface modification is an important contribution to biomaterials development. Among many biomaterials used for tissue engineering, polyesters have been well documented for their excellent biodegradability, biocompatibility and nontoxicity. However, poor hydrophilicity and the lack of natural recognition sites on the surface of polyesters have greatly limited their further application in the tissue engineering field. Therefore, how to introduce functional groups or molecules to polyester surfaces, which ideally adjust cell/tissue biological functions, becomes more and more important. In this review, recent advances in polyester surface modification and their applications are reviewed. The development of new technologies or methods used to modify polyester surfaces for developing their biocompatibility is introduced. The results of polyester surface modifications by surface morphological modification, surface chemical group/charge modification, surface biomacromolecule modification and so on are reported in detail. Modified surface properties of polyesters directly related to in vitro/vivo biological performances are presented as well, such as protein adsorption, cell attachment and growth and tissue response. Lastly, the prospect of polyester surface modification is discussed, especially the current conception of biomimetic and molecular recognition.

  4. Mechanism of Reduction Action of Unsaturated Polyester Resin

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    The reduction action mechanism of the unsatrurated polyester resin reducer is analysed by the free space volume theory.Through measuring the reduction magnitude in each phase of solidification,the authors predicted the rate of reduction is in concordance with the results from experiments.From this we presented corresponding solutions to different causes of the reduction action of the unsaturated polyester resin.

  5. Vanadium Trineodecanoate Promoter for Fiberglass-Polyester Soil Surfacings.

    Science.gov (United States)

    1980-06-01

    surfaces for soils consists of a polyester resin, cumene hydroperoxide catalyst and a promoter solution containing a vanadium salt and N,N-dimethyl-p-tolui...4 Synthesis of Vanadium Trineodecanoate .. .... ......... 4 Reactions Using Various Reagents. ..... ........... 4 Analysis of Vanadium...polymer system consists of a polyester resin, a peroxide cata- lyst ( cumene hydroperoxide) and a two-part, premixed, promoter solution. The promoter

  6. Microbial degradation of polyurethane, polyester polyurethanes and polyether polyurethanes.

    Science.gov (United States)

    Nakajima-Kambe, T; Shigeno-Akutsu, Y; Nomura, N; Onuma, F; Nakahara, T

    1999-02-01

    Polyurethane (PUR) is a polymer derived from the condensation of polyisocyanate and polyol and it is widely used as a base material in various industries. PUR, in particular, polyester PUR, is known to be vulnerable to microbial attack. Recently, environmental pollution by plastic wastes has become a serious issue and polyester PUR had attracted attention because of its biodegradability. There are many reports on the degradation of polyester PUR by microorganisms, especially by fungi. Microbial degradation of polyester PUR is thought to be mainly due to the hydrolysis of ester bonds by esterases. Recently, polyester-PUR-degrading enzymes have been purified and their characteristics reported. Among them, a solid-polyester-PUR-degrading enzyme (PUR esterase) derived from Comamonas acidovorans TB-35 had unique characteristics. This enzyme has a hydrophobic PUR-surface-binding domain and a catalytic domain, and the surface-binding domain was considered as being essential for PUR degradation. This hydrophobic surface-binding domain is also observed in other solid-polyester-degrading enzymes such as poly(hydroxyalkanoate) (PHA) depolymerases. There was no significant homology between the amino acid sequence of PUR esterase and that of PHA depolymerases, except in the hydrophobic surface-binding region. Thus, PUR esterase and PHA depolymerase are probably different in terms of their evolutionary origin and it is possible that PUR esterases come to be classified as a new solid-polyester-degrading enzyme family.

  7. Characterization of emissions of dioxins and furans from ethylene dichloride (EDC), vinyl chloride (VCM) and polyvinylchloride (PVC) manufacturing facilities in the United States. I. Resin, treated wastewater, and ethylene dichloride.

    Science.gov (United States)

    Carroll, W F; Berger, T C; Borrelli, F E; Garrity, P J; Jacobs, R A; Lewis, J W; McCreedy, R L; Tuhovak, D R; Weston, A F

    1998-01-01

    Under the auspices of its Dioxin Characterization Program, members of The Vinyl Institute (VI), have analyzed for potential polychlorinated dibenzodioxin/furan (PCDD/F) concentrations in polyvinylchloride (PVC) resins, treated wastewater effluent and ethylene dichloride (EDC) product at EDC, vinyl chloride monomer (VCM) and PVC manufacturing facilities in the U.S. and Canada. No 2,3,7,8-tetrachlorodibenzodioxin (TCDD) was detected in any sample analyzed under the program to date. Trace concentrations (low pg/g) of PCDD/F were detected in only a few samples of PVC resins and EDC product. Treated wastewater contained low ppq concentrations of PCDD/F. All concentrations are expressed as Toxic Equivalents (TEQ). Extrapolation of these data shows that the contribution of EDC/VCM/PVC manufacturing via these media constitutes substantially less than 1 percent of the estimated annual U.S. dioxin releases to the environment.

  8. Polyester mooring stiffness modeling for deepwater floating system

    Institute of Scientific and Technical Information of China (English)

    Chen Yongjun; Qu Yan; Zhang Tianyu

    2013-01-01

    Polyester mooring has become increasing popular to serve as permanent station-keeping system for deepwater floating system during recent years.Comparing to the traditional steel wire mooring,polyester mooring provides significant benefits in deepwater,such as reduced installed capital expenditure (CAPEX) and smaller vertical loads on host platform.Polyester rope is a visco-elastic material,and its stiffness is nonlinear and affected by mean load,load range,loading period and loading history.There is a perception that the polyester stiffness model has significant impact on the floating system' s performance.This paper presents a detailed description and comparison of two stiffness models and three analytic approaches,and provides a systematic study of the impact of polyester mooring stiffness modeling on the deepwater floating system performance.

  9. 废涤棉纺织品分离回收再生技术研究%Study on the separation and recycling technology of waste polyester cotton textiles

    Institute of Scientific and Technical Information of China (English)

    李现顺; 甘胜华; 岳阳; 吴宝宅; 唐世君; 汪少朋

    2015-01-01

    The importance and methods of the recycling of the waste PET textiles were briefly introduced. By experi-ment study,it is illustrated that the alcoholysis route is a effective method of recycling polyester cotton blended fab-ric. The process of alcoholysis,polyester cotton separation,recycled cotton processing and repolymerization was stud-ied. The polyester cotton recovery process route was envisaged.%简要介绍了废PET纺织品回收的重要性和方法,通过实验研究,说明醇解路线是将涤棉混纺织物分离回收再利用的有效手段. 在醇解工艺、涤棉分离、回收棉的处理、醇解物再聚合方面进行了研究,提出了涤棉回收工艺路线设想.

  10. High-Throughput Analysis of Enzymatic Hydrolysis of Biodegradable Polyesters by Monitoring Cohydrolysis of a Polyester-Embedded Fluorogenic Probe.

    Science.gov (United States)

    Zumstein, Michael Thomas; Kohler, Hans-Peter E; McNeill, Kristopher; Sander, Michael

    2017-02-14

    Biodegradable polyesters have the potential to replace nondegradable, persistent polymers in numerous applications and thereby alleviate plastic accumulation in the environment. Herein, we present an analytical approach to study enzymatic hydrolysis of polyesters, the key step in their overall biodegradation process. The approach is based on embedding fluorescein dilaurate (FDL), a fluorogenic ester substrate, into the polyester matrix and on monitoring the enzymatic cohydrolysis of FDL to fluorescein during enzymatic hydrolysis of the polyester. We validated the approach against established techniques using FDL-containing poly(butylene adipate) films and Fusarium solani cutinase (FsC). Implemented on a microplate reader platform, the FDL-based approach enabled sensitive and high-throughput analysis of the enzymatic hydrolysis of eight aliphatic polyesters by two fungal esterases (FsC and Rhizopus oryzae lipase) at different temperatures. While hydrolysis rates for both enzymes increased with decreasing differences between the polyester melting temperatures and the experimental temperatures, this trend was more pronounced for the lipase than the cutinase. These trends in rates could be ascribed to a combination of temperature-dependent polyester chain flexibility and accessibility of the enzyme active site. The work highlights the capability of the FDL-based approach to be utilized in both screening and mechanistic studies of enzymatic polyester hydrolysis.

  11. Polyester textile functionalization through incorporation of pH/thermo-responsive microgels. Part II: polyester functionalization and characterization

    NARCIS (Netherlands)

    Glampedaki, P.; Calvimontes, A.; Dutschk, V.; Warmoeskerken, M.M.C.G.

    2012-01-01

    A new approach to functionalize the surface of polyester textiles is described in this study. Functionalization was achieved by incorporating pH/temperature-responsive polyelectrolyte microgels into the textile surface layer using UV irradiation. The aim of functionalization was to regulate polyeste

  12. Disposable polyester-toner electrophoresis microchips for DNA analysis.

    Science.gov (United States)

    Duarte, Gabriela R M; Coltro, Wendell K T; Borba, Juliane C; Price, Carol W; Landers, James P; Carrilho, Emanuel

    2012-06-07

    Microchip electrophoresis has become a powerful tool for DNA separation, offering all of the advantages typically associated with miniaturized techniques: high speed, high resolution, ease of automation, and great versatility for both routine and research applications. Various substrate materials have been used to produce microchips for DNA separations, including conventional (glass, silicon, and quartz) and alternative (polymers) platforms. In this study, we perform DNA separation in a simple and low-cost polyester-toner (PeT)-based electrophoresis microchip. PeT devices were fabricated by a direct-printing process using a 600 dpi-resolution laser printer. DNA separations were performed on PeT chip with channels filled with polymer solutions (0.5% m/v hydroxyethylcellulose or hydroxypropylcellulose) at electric fields ranging from 100 to 300 V cm(-1). Separation of DNA fragments between 100 and 1000 bp, with good correlation of the size of DNA fragments and mobility, was achieved in this system. Although the mobility increased with increasing electric field, separations showed the same profile regardless of the electric field. The system provided good separation efficiency (215,000 plates per m for the 500 bp fragment) and the separation was completed in 4 min for 1000 bp fragment ladder. The cost of a given chip is approximately $0.15 and it takes less than 10 minutes to prepare a single device.

  13. 78 FR 51707 - Certain Polyester Staple Fiber From the Republic of Korea: Rescission of Antidumping Duty...

    Science.gov (United States)

    2013-08-21

    ... International Trade Administration Certain Polyester Staple Fiber From the Republic of Korea: Rescission of... administrative review of the antidumping duty order on certain polyester staple fiber (polyester staple fiber... antidumping duty order on polyester staple fiber from Korea for the period May 1, 2012, through April 30,...

  14. 76 FR 57955 - Certain Polyester Staple Fiber From Taiwan: Final Results of Antidumping Duty Administrative Review

    Science.gov (United States)

    2011-09-19

    ... International Trade Administration Certain Polyester Staple Fiber From Taiwan: Final Results of Antidumping Duty... administrative review of the antidumping duty order on certain polyester staple fiber from Taiwan. The period of... certain polyester staple fiber from Taiwan. See Certain Polyester Staple Fiber From Taiwan:...

  15. Reactive modification of polyesters and their blends

    Science.gov (United States)

    Wan, Chen

    2004-12-01

    As part of a broader research effort to investigate the chemical modification of polyesters by reactive processing a low molecular weight (MW) unsaturated polyester (UP) and a higher MW saturated polyester, polyethylene terephthalate (PET), alone or blended with polypropylene (PP) were melt processed in a batch mixer and continuous twin screw extruders. Modification was monitored by on-line rheology and the products were characterized primarily by off-line rheology, morphology and thermal analysis. Efforts were made to establish processing/property relationships and provide an insight of the accompanying structural changes. The overall response of the reactively modified systems was found to be strongly dependent on the component characteristics, blend composition, type and concentrations of reactive additives and processing conditions. The work concluded that UP can be effectively modified through reactive melt processing. Its melt viscosity and MW can be increased through chemical reactions between organic peroxides (POX) and chain unsaturation or between MgO and carboxyl/hydroxyl end groups. Reactive blending of PP/UP blends through peroxide modification gave finer and more uniform morphology than unreacted blends and at a given PP/UP weight ratio more thermoplastic elastomers-like rheological behavior. This is due to the continuously decreasing viscosity ratio of PP/UP towards unity by the competing reactions between POX and the blend components and formation of PP-UP copolymers which serve as in-situ compatibilizers to promote better interfacial adhesion. Kinetics of the competing reactions were analyzed through a developed model. In addition to POX concentration and mixing efficiency, rheology and morphology of UP/PP bends were significantly affected by the addition of inorganic and organic coagents. Addition of coagents such as a difunctional maleimide, MgO and/or an anhydride functionalized PP during reactive blending offers effective means for tailoring

  16. Toward a Long-Chain Perfluoroalkyl Replacement: Water and Oil Repellency of Polyethylene Terephthalate (PET) Films Modified with Perfluoropolyether-Based Polyesters.

    Science.gov (United States)

    Demir, Tugba; Wei, Liying; Nitta, Naoki; Yushin, Gleb; Brown, Philip J; Luzinov, Igor

    2017-07-19

    Original perfluoropolyethers (PFPE)-based oligomeric polyesters (FOPs) of different macromolecular architecture were synthesized via polycondensation as low surface energy additives to engineering thermoplastics. The oligomers do not contain long-chain perfluoroalkyl segments, which are known to yield environmentally unsafe perfluoroalkyl carboxylic acids. To improve the compatibility of the materials with polyethylene terephthalate (PET) we introduced isophthalate segments into the polyesters and targeted the synthesis of lower molecular weight oligomeric macromolecules. The surface properties such as morphology, composition, and wettability of PET/FOP films fabricated from solution were investigated using atomic force microscopy, X-ray photoelectron spectroscopy, and contact angle measurements. It was demonstrated that FOPs, when added to PET film, readily migrate to the film surface and bring significant water and oil repellency to the thermoplastic boundary. We have established that the wettability of PET/FOP films depends on three main parameters: (i) end-groups of fluorinated polyesters, (ii) the concentration of fluorinated polyesters in the films, and (iii) equilibration via annealing. The most effective water/oil repellency FOP has two C4F9-PFPE-tails. The addition of this oligomeric polyester to PET allows (even at relatively low concentrations) reaching a level of oil repellency and surface energy comparable to that of polytetrafluorethylene (PTFE/Teflon). Therefore, the materials can be considered suitable replacements for additives containing long-chain perfluoroalkyl substances.

  17. The Assessing of the Failure Behavior of Glass/Polyester Composites Subject to Quasi Static Stresses

    Science.gov (United States)

    Stanciu, M. D.; Savin, A.; Teodorescu-Drăghicescu, H.

    2017-06-01

    Using glass fabric reinforced composites for structure of wind turbine blades requires high mechanical strengths especially to cyclic stresses. Studies have shown that approximately 50% of composite material failure occurs because of fatigue. Composites behavior to cyclic stresses involves three stages regarding to stiffness variation: the first stage is characterized by the accelerated decline of stiffness with micro-cracks, the second stage - a slight decrease of stiffness characterized by the occurrence of delamination and third stage characterized by higher decreases of resistance and occurrence of fracture thereof. The aim of the paper is to analyzed the behavior of composites reinforced with glass fibers fabric type RT500 and polyester resin subjected to tensile cyclic loading with pulsating quasi-static regime with asymmetry coefficient R = 0. The samples were tested with the universal tensile machine LS100 Lloyd Instruments Plus, with a load capacity of 100 kN. The load was applied with different speeds of 1 mm/min, 10 mm/min and 20 mm/min. After tests, it was observed that the greatest permanent strains were recorded in the first load cycles when the total energy storage by material was lost due to internal friction. With increasing number of cycles, the glass/polyester composites ability to store energy of deformation decreases, the flow phenomenon characterized by large displacements to smaller loading forces appearing.

  18. Phase separation during radiation crosslinking of unsaturated polyester resin

    Science.gov (United States)

    Pucić, Irina; Ranogajec, Franjo

    2003-06-01

    Phase separation during radiation-initiated crosslinking of unsaturated polyester resin was studied. Residual reactivity of liquid phases and gels of partially cured samples was determined by DSC. Uncured resin and liquid phases showed double reaction exotherm, gels had a single maximum that corresponded to higher-temperature maximum of liquid parts. The lower-temperature process was attributed to styrene-polyester copolymerization. At higher temperatures, polyester unsaturations that remained unreacted due to microgel formation homopolymerized. FTIR revealed different composition of phases. In thicker samples, reaction heat influenced microgel formation causing delayed appearance of gel and faster increase in conversion.

  19. Zonal wavefront sensing using a grating array printed on a polyester film

    Energy Technology Data Exchange (ETDEWEB)

    Pathak, Biswajit; Boruah, Bosanta R., E-mail: brboruah@iitg.ernet.in [Department of Physics, Indian Institute of Technology Guwahati, Guwahati, Assam 781039 (India); Kumar, Suraj [Department of Applied Sciences, Gauhati University, Guwahati, Assam 781014 (India)

    2015-12-15

    In this paper, we describe the development of a zonal wavefront sensor that comprises an array of binary diffraction gratings realized on a transparent sheet (i.e., polyester film) followed by a focusing lens and a camera. The sensor works in a manner similar to that of a Shack-Hartmann wavefront sensor. The fabrication of the array of gratings is immune to certain issues associated with the fabrication of the lenslet array which is commonly used in zonal wavefront sensing. Besides the sensing method offers several important advantages such as flexible dynamic range, easy configurability, and option to enhance the sensing frame rate. Here, we have demonstrated the working of the proposed sensor using a proof-of-principle experimental arrangement.

  20. Micro-mesh fabric pollination bags for switchgrass

    Science.gov (United States)

    Pollination bags for making controlled crosses between switchgrass plants were made from a polyester micro-mesh fabric with a mesh size of 41 µm which is smaller than the mean reported 43 µm diameter of switchgrass pollen. When used in paired plant crosses between switchgrass plants, the mean amoun...

  1. An Efficient Way of Fabric Simulation

    Institute of Scientific and Technical Information of China (English)

    ZHONG Yue-qi; WANG Shan-yuan

    2002-01-01

    A partide system model is presented for the simulation of fabric draping. The interaction of each partide is based on a refined mass-spring structure. Regarded the fabric material as an orthotropic continuum, the refinement of our model is focused on the construction of mechanical responses of bending and shearing springs by means of a piecewise polynomial approximation of KES-F testing data. In this way, the draping figure of a silk fabric, a wool fabric and a polyester fabric are simulated. The static final shape and animation of simulation proves that our model has developed an efficient technique on real fabric- drape modeling, and the little computation time of the simulation execution on a PC with Celeron 450 CPU may meet the requirement of real-time simulation.

  2. Synthetic polyester-hydrolyzing enzymes from thermophilic actinomycetes.

    Science.gov (United States)

    Wei, Ren; Oeser, Thorsten; Zimmermann, Wolfgang

    2014-01-01

    Thermophilic actinomycetes produce enzymes capable of hydrolyzing synthetic polyesters such as polyethylene terephthalate (PET). In addition to carboxylesterases, which have hydrolytic activity predominantly against PET oligomers, esterases related to cutinases also hydrolyze synthetic polymers. The production of these enzymes by actinomycetes as well as their recombinant expression in heterologous hosts is described and their catalytic activity against polyester substrates is compared. Assays to analyze the enzymatic hydrolysis of synthetic polyesters are evaluated, and a kinetic model describing the enzymatic heterogeneous hydrolysis process is discussed. Structure-function and structure-stability relationships of actinomycete polyester hydrolases are compared based on molecular dynamics simulations and recently solved protein structures. In addition, recent progress in enhancing their activity and thermal stability by random or site-directed mutagenesis is presented.

  3. Highly Branched Bio-Based Unsaturated Polyesters by Enzymatic Polymerization

    DEFF Research Database (Denmark)

    Nguyen, Hiep Dinh; Löf, David; Hvilsted, Søren

    2016-01-01

    A one-pot, enzyme-catalyzed bulk polymerization method for direct production of highly branched polyesters has been developed as an alternative to currently used industrial procedures. Bio-based feed components in the form of glycerol, pentaerythritol, azelaic acid, and tall oil fatty acid (TOFA....... This allows simple variations in the molar mass and structure of the polyester without premature gelation, thus enabling easy tailoring of the branched polyester structure. The postpolymerization crosslinking of the polyesters illustrates their potential as binders in alkyds. The formed films had good UV...... stability, very high water contact angles of up to 141° and a glass transition temperature that could be controlled through the feed composition....

  4. Light scattering of thin azobenzene side-chain polyester layers

    DEFF Research Database (Denmark)

    Kerekes, Á.; Lörincz, E.; Ramanujam, P.S.

    2002-01-01

    characteristics than the liquid crystalline polyester. The amorphous samples have negligible polarization part orthogonal to the incident beam. the liquid crystalline samples have relative high orthogonal polarization part in light scattering, The light scattering results can be used to give a lower limit...... for the domain size in thin liquid crystalline polyester layers being responsible for the dominant light scattering. The characteristic domain Sizes obtained from the Fourier transformation of polarization microscopic Pictures confirm these values.......Light scattering properties of liquid crystalline and amorphous azobenzene side-chain polyester layers used for optical data storage were examined by means of transmissive scatterometry. Comparative experiments show that the amorphous polyester has significantly lower light scattering...

  5. STUDY ON THE SYNTHESIS AND PHYSICOCHEMICAL PROPERTIES OF SUCROSE POLYESTER

    Institute of Scientific and Technical Information of China (English)

    LIU Zhongdong; LIU Huihua; LUO Peng; LIU Peng; Xiao Fugang

    2006-01-01

    Orthogonal test was used to evaluate the effects of synthetic such as temperature (120~140 ℃), reaction time (4-6) and substrate molar ratio of methyl oleate to sucrose (8:1-12:1) on the percent quantity conversion to sucrose polyester. Sucrose polyester was synthesized by a solvent-free one-stage interesterification. The optimum reaction conditions are as follows: methyl oleate/sucrose = 10∶1 (mol/mol); reaction temperature is 140 ℃;yield reaches 88.15%, and the degree of esterification (DE) is over 7 in the conditions. Thin layer chromatography (TLC), column chromatography (CC), High-performance liquid chromatography (HPLC) were used to analyze the product, the results show that the percent of sucrose polyoleate is over 70% in the product. The physicochemical properties of sucrose polyesters were compared with cooking oil. The results show that the qualities of sucrose polyesters are all up to the triglyceride.

  6. Bright Prospect for the Polyester Industrial Filament Sector

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    @@ Some large companies from Americaand Europe have constructed plantsin China or established long-termstable cooperation relationship withChinese enterprises. A bright devel-opment prospect has therefore beenbrought to the polyester industrial fila-ment sector in China.

  7. Nano-biocomposites based on synthetic aliphatic polyesters and nanoclay

    CSIR Research Space (South Africa)

    Ojijo, Vincent O

    2014-05-01

    Full Text Available This article gives an overview of the recent developments in the preparation, characterisation, properties, crystallisation behaviour, and melt rheology of clay-containing composites of biodegradable synthetic aliphatic polyesters such as poly...

  8. Amino alcohol-based degradable poly(ester amide) elastomers

    NARCIS (Netherlands)

    C.J. Bettinger (Christopher); J.P. Bruggeman (Joost); J.T. Borenstein (Jeffrey); R.S. Langer (Robert)

    2008-01-01

    textabstractCurrently available synthetic biodegradable elastomers are primarily composed of crosslinked aliphatic polyesters, which suffer from deficiencies including (1) high crosslink densities, which results in exceedingly high stiffness, (2) rapid degradation upon implantation, or (3) limited c

  9. STUDY ON POLYSULFONE-POLYESTER BLOCK COPOLYMERS

    Institute of Scientific and Technical Information of China (English)

    DING Youjun; QI Daquan

    1988-01-01

    Synthesis and characterization of a series of Polysulfone (PSF)-Polyester (PEs) block copolymers were studied.The degree of randomness (B) of these block copolymers was calculated from the intensities of their proton signals in 1H NMR spectra and lies in the region of 0 < B < 1. It was shown that the degree of randomness (B) and the average sequence length (L) in block copolymers were relatively dependent on the reaction conditions, various feed ratios and structure of diols.The phenomenon was observed, when the PSF-PEs block copolymers dissolved in different solvents they had different viscosities and molecular conformations.The PSF-PEs block copolymers had better solvent resistance than homo-polysulfone.

  10. Characterization of material composite marble-polyester

    Directory of Open Access Journals (Sweden)

    Corpas, F. A.

    2002-12-01

    Full Text Available In this work we characterize a new material composite, formed with a polyester and crushed white marble mixture. The final purpose is double: to obtain a material for applications sufficiently competitive after an economic viability study, increasing the yield of the main commodity, using waste marble and improving the jobs in the quarries area. From the results obtained, we deduce then that this material could be used to inside and outside adornment.

    En este trabajo, caracterizamos un nuevo material compuesto, formado con una mezcla de poliéster y de mármol blanco triturado. El propósito final es doble: por un lado obtener un material para aplicaciones lo suficientemente competitivas como para que se pueda iniciar un estudio económico de viabilidad, aumentando el rendimiento de la materia prima y mejorando las salidas laborales de las comarcas extractoras. Para la caracterización del material se ha determinado el porcentaje adecuado de poliéster. Así como las propiedades mecánicas (flexión, compresión y dureza, químicas, fatiga térmica y su influencia a la exposición solar In order to characterized of material, we have determined the suitable porcentage of polyester Also we have carried out a study of the mechanical (stretching, resistance to traction, hardeness and thermal fatigue chemicals properties and solar radiation influence. De los resultados obtenidos, este material podría ser utilizado para ornamentación tanto de interior como de exterior.

  11. THE GAS TRANSPORT BEHAVIOR IN AROMATIC POLYESTER MEMBRANES

    Institute of Scientific and Technical Information of China (English)

    ZHANG Jian; SUN Qiushi; HOU Xiaohuai

    1996-01-01

    Six aromatic polyesters were prepared for gas separation membranes, and their permeation properties for hydrogen, oxygen, nitrogen, carbon dioxide, and methane were measured at 30℃ and 1 atmosphere by low pressure manometric method. The correlation between the gas transport behavior and molecular structure of aromatic polyester membrane is discussed. These data are interpreted qualitatively in terms of the calculated packing density, gas-polymer interaction, concentration of aryl bromine on backbone, and effect of silane group on main chain of polymer.

  12. Synthesis and characterization of gelatin based polyester urethane scaffold

    Indian Academy of Sciences (India)

    S Sarkar; A Chourasia; S Maji; S Sadhukhan; S Kumar; B Adhikari

    2006-10-01

    For tissue engineering purpose two gelatin based polyester urethane scaffolds of different compositions were prepared from lactic acid, polyethylene glycol 400 (PEG 400) and characterized by FTIR, XRD for their mechanical and morphological properties using SEM and optical microscopic analyses. Degradation and swelling studies of gelatin based polyester urethane scaffolds in phosphate buffer saline (PBS) were performed. Human keratinocyte cells were cultured within these scaffolds, which showed good cell adherence and proliferation.

  13. Rheological behaviour of nanocellulose reinforced unsaturated polyester nanocomposites.

    Science.gov (United States)

    Chirayil, Cintil Jose; Mathew, Lovely; Hassan, P A; Mozetic, Miran; Thomas, Sabu

    2014-08-01

    Nanocellulose (NC) reinforced unsaturated polyester (UPR) composites were prepared by mechanical mixing process. Effect of isora nanocellulose on the properties of polyester composites has been studied in detail. Rheological properties of unsaturated polyester resin suspensions containing various amounts (0.5, 1 and 3wt%) of nanocellulose were investigated by oscillatory rheometer with parallel plate geometry. Analysis of curing revealed that the time required for gelation in NC filled UPR is lower than neat resin, which describe the catalytic action of NC on cure reaction. NC reinforced polyester suspensions showed shear thinning behaviour initially and at higher shear rates they showed Newtonian behaviour. Tensile and impact properties showed superior behaviour revealing improved interfacial bonding between nanofiller and the polymer matrix. With respect to the neat polyester the percentage increase in tensile strength of 0.5wt% NC reinforced composite is 57%. Optical and atomic force microscopic studies confirmed that the dispersion state of NC within the polyester matrix was adequate. Maximum glass transition temperature is obtained for 0.5wt% NC reinforced composite, which showed an increase of 10°C than neat resin.

  14. Flexible polyester cellulose paper supercapacitor with a gel electrolyte.

    Science.gov (United States)

    Karthika, Prasannan; Rajalakshmi, Natarajan; Dhathathreyan, Kaveripatnam S

    2013-11-11

    A low-cost polyester cellulose paper has been used as a substrate for a flexible supercapacitor device that contains aqueous carbon nanotube ink as the electrodes and a polyvinyl alcohol (PVA)-based gel as the electrolyte. Gel electrolytes have attracted much interest due to their solvent-holding capacity and good film-forming capability. The electrodes are characterized for their conductivity and morphology. Because of its high conductivity, the conductive paper is studied in supercapacitor applications as active electrodes and as separators after coating with polyvinylidene fluoride. Carbon nanotubes deposited on porous paper are more accessible to ions in the electrolyte than those on flat substrates, which results in higher power density. A simple fabrication process is achieved and paper supercapacitors are tested for their performance in both aqueous and PVA gel electrolytes by using galvanostatic and cyclic voltammetry methods. A high specific capacitance of 270 F g(-1) and an energy density value of 37 W h kg(-1) are achieved for devices with PVA gel electrolytes. Furthermore, this device can maintain excellent specific capacitance even under high currents. This is also confirmed by another counter experiment with aqueous sulfuric acid as the electrolyte. The cycle life, one of the most critical parameters in supercapacitor operations, is found to be excellent (6000 cycles) and less than 0.5 % capacitance loss is observed. Moreover, the supercapacitor device is flexible and even after twisting does not show any cracks or evidence of breakage, and shows almost the same specific capacitance of 267 F g(-1) and energy density of 37 W h kg(-1) . This work suggests that a paper substrate can be a highly scalable and low-cost solution for high-performance supercapacitors.

  15. Mechanical and dynamic mechanical behaviour of novel glass–natural fibre intra-ply woven polyester composites

    Indian Academy of Sciences (India)

    M RAJESH; JEYARAJ PITCHAIMANI

    2017-07-01

    A novel intra-ply woven fabric polyester composite with glass fibre yarns in one direction and natural fibre yarns in another direction of basket-type woven fabric has been investigated for mechanical and dynamic mechanical characteristics. Individual glass fibre woven fabric, natural fibres woven fabric and intraplynatural fibres woven fabric composites are also investigated for the comparison purpose. Results reveal that the intra-ply woven fabric hybridization enhances impact and damping properties of the composite significantly than the tensile and flexural properties. Intra-ply woven fabrics with glass fibre yarns in warp direction and jute fibre yarns in weft direction (WGWJ) exhibit better impact properties compared with woven fabric with other combinations. Dynamic mechanical analysis results reveal that intra-ply woven fabric composite with glass fibreyarns in warp direction and jute and banana fibre yarns in weft direction (WGWJAB) gives higher damping characteristics due to the multi-level interaction between fibre–fibre and fibre–matrix interactions.

  16. Machinability Study of Hybrid Nanoclay-Glass Fibre Reinforced Polyester Composites

    Directory of Open Access Journals (Sweden)

    P. Prabhu

    2013-01-01

    Full Text Available Glass fibre reinforced polyester composites (GRP and hybrid nanoclay and glass fibre reinforced polyester nanocomposites (CGRP are fabricated by vacuum assisted resin infusion technique. The optimum mechanical properties are obtained for CGRP with 3 wt.% nanoclay. Three types of drills (carbide twist drill D 5407060, HSS twist drill BS-328, and HSS end mill (4 flutes “N”-type end mill RH-helical flute of 6 mm diameters are used to drill holes on GRP and CGRP. Three different speeds (600, 852, and 1260 rpm and two different feeds (0.045, 0.1 mm/rev are selected as process parameters. The effect of process parameter on thrust force and delamination during drilling CGRP is analyzed for optimizing the machining parameters. The delamination factor is low for the optimum process parameter (feed = 0.1 mm/rev and speed 852 rpm. Microstructural analysis confirms that at higher feeds, delamination is low for CGRP drilled with carbide tools. In order to analyze the effect of nanoclay in CGRP on tool wear, 200 holes were drilled on CGRP samples with 3 wt.% nanoclay, and the tool wear is analyzed under optimized parametric condition. Tool wear is high in HSS twist drill compared with carbide drill. The presence of nanoclay also accelerates the tool wear.

  17. A study of cleansing property of detergents on cotton, polyester and their blend

    Science.gov (United States)

    Patel, Vaishali P.

    Proper cleaning of clothes is one of the important aspects to be considered for increasing their life. Soil gets accumulated on textiles which needs to be cleaned for reusability. There are a variety of textile materials available and a variety brands of detergents for laundry purpose, to select the right brand is of much importance as it is based on detergent performance and money spent. The present study is an effort to determine which are the various popular brands of detergents, and to study the ability of cleaning property of a few of them. Eight brand of detergents namely: Ariel Microshine, Surf Excel, Surf, Super Nirma, Super Wheel with lemon, Hipolin, Rin were studied by artificially soiling of cotton, polyester and cotton/polyester blend fabrics, at four different concentration of soiling of washing with four different concentration of detergents. Both hand washing and machine washing technique was followed. All the detergent showed batter cleaning in hand washing technique in comparison with machine washing amongst all the various brands of detergents studied, Ariel Microshine show the best cleaning property, the poorest were Wheel and Rin. Ariel Microshine was the costliest of all. The best bargain in terms of cleansing property and price was Hipolin.

  18. 77 FR 54562 - Certain Polyester Staple Fiber From the Republic of Korea: Rescission of Antidumping Duty...

    Science.gov (United States)

    2012-09-05

    ...] Certain Polyester Staple Fiber From the Republic of Korea: Rescission of Antidumping Duty Administrative...'') initiated an administrative review of the antidumping duty order on certain polyester staple fiber from...

  19. SOLUTION RHEOLOGY OF HYPERBRANCHED POLYESTERS AND THEIR BLENDS WITH LINEAR POLYMERS

    Science.gov (United States)

    In this study, the rheological properties of different generations of hyperbranched polyesters in 1-methyl-2-pyrrolidinone solvent and their blends with poly(2-hydroxyethyl methacrylate) have ben investigated. All the hyperbranched polyester solutions exhibited Newtonian behavior...

  20. Mechanism and Effectiveness of Reduction Action of Unsaturated Polyester Resin Reducer

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    The reduction action mechanism of unsaturated polyester resin reducer is analysed.The experimental results show that the active reducer bearing reactive functional group on the ends of molecules effectively lowers the curing shrinkage of unvaturated polyester resin.

  1. SOLUTION RHEOLOGY OF HYPERBRANCHED POLYESTERS AND THEIR BLENDS WITH LINEAR POLYMERS

    Science.gov (United States)

    In this study, the rheological properties of different generations of hyperbranched polyesters in 1-methyl-2-pyrrolidinone solvent and their blends with poly(2-hydroxyethyl methacrylate) have ben investigated. All the hyperbranched polyester solutions exhibited Newtonian behavior...

  2. 采用分散染料混合物解决涤纶热定型色变弊病%The application of disperse dyes mixture in solving off shade problems during heat-setting process for colored polyester fabrics

    Institute of Scientific and Technical Information of China (English)

    蒋金根

    2012-01-01

    With the same sublimation fastness of 3.0, Disperse Yellow E-RG-2 dye mixture, Disperse Red M-3B dye mixture and Disperse Blue 2BLN were used for the three-primary colors. Thus, the obvious off shade problems caused by different sublimation grade of each dye component were solved during heat-setting process for middle- or light-colored polyester textiles and product yield was impro+ved accordingly. The Disperse Gray SE-M dye mixture from further blending of the three-primary colors above had the same balanced sublimation fastness and stable shade.%采用升华牢度均为3.0级的分散黄E—RG-2染料混合物、分散红M-3B染料混合物和分散蓝2BLN染料作为三原色,对中浅色涤纶面料染色,在受热定型时解决了因各染料成分升华不一致而导致严重色光变化的问题,提高了成品率。该三原色进一步拼混还可获得一种分散&SE—M染料混合物,同样也具有升华牢度的平衡性和受热定型时色光的稳定性。

  3. Effect of soaking time and concentration of NaOH solution on mechanical properties of coir–polyester composites

    Indian Academy of Sciences (India)

    S Jayabal; S Sathiyamurthy; K T Loganathan; S Kalyanasundaram

    2012-08-01

    The green husk coir fibres were treated with different levels of soaking time and concentration of alkali solution. As a result of alkali treatment, the surface modifications were done on the fibre surface and were studied using scanning electron micrographs. The coir–polyester composites were fabricated using hand lay up process and the mechanical properties (tensile, flexural and impact strength) were evaluated as per ASTM standards. The effect of soaking time and concentration of NaOH solution were studied based on evaluated values of mechanical properties to find out optimum fibre treatment parameters.

  4. Influence of different acids for adjusting the dyebath ph value on the dyeability of polyester knitwear dyed with disperse yellow 23

    Directory of Open Access Journals (Sweden)

    Miljković Milena N.

    2011-01-01

    Full Text Available In this paper the influence of the formic and oxalic acids, as substances for dyebath pH adjusting, on the dyeability of polyester fabric dyed with disperse dye Disperse Yellow 23 was examined. The polyester undyed knitwear samples were dyed in baths containing the acids under the same dyeing conditions. Color differences of the samples were assessed using the reflectiometry technique and expressed in terms of CIELcoordinates. The influence of the tested acids on the surface structure of dyed polyester fibers was examined using the scanning electron microscopy (SEM. It was found that the differences in obtained dyeabilities, in the presence of both formic and oxalic acid, are acceptable according to both M&S 83A and CMC (2:1 standards which was not the case with acetic acid. Therefore, acetic acid can be replaced with either formic or oxalic acid as substances for dyebath pH adjusting in the dyeing process described in this paper. SEM micrographs showed small differences in the surface structure of dyed fibers, as well as differences in the shape of undyed samples’ reflectance curves in presence of the acids. Since all of the color differences were quite small, it can be concluded that the influence of formic and oxalic acids on the polyester knitwear dyeability is not significantly different than that of acetic acid.

  5. Effect of Workwear Fabric Characteristics on the Changes in Tensile Properties of Sewing Threads after Sewing

    Directory of Open Access Journals (Sweden)

    Vinay Kumar Midha, Ph.D.

    2010-03-01

    Full Text Available During sewing at high speed, the needle thread issubjected to repeated tensile stresses, heat, bending,pressure, torsion and wearing. These stresses act onthe thread repeatedly and the thread passes 50-80times through the fabric, the needle eye and thebobbin case mechanism, before getting incorporatedinto the seam. As a result both the sewing thread andthe yarns in the fabric get abraded/ severed during theseaming process. A number of researchers observedthat there could be 30% to 40% strength loss in thecotton needle thread after sewing. The extent ofdamage becomes more critical if the fabric beingused is of a dense, thick and heavy construction. Anumber of studies have been carried out on threadstrength loss after sewing, but the impact of fabriccharacteristics on thread strength loss is stillunexplored. In this paper, the effect of weight andfabric composition of workwear fabrics, on thechanges in the tenacity, breaking elongation andinitial modulus of the needle thread has been studied.The tenacity and breaking elongation loss increasewith increase in fabric weight for staple threads andremain unchanged for core spun threads. The loss ininitial modulus increases for polyester threads asfabric weight increases, and decreases for cottonthread. When sewn on polyester-cotton fabric ofsame weight, the cotton thread shows decrease intenacity and breaking elongation loss, whereas loss ininitial modulus increases. The polyester core spunthreads show exactly opposite change, i.e. tenacityand elongation loss increase and loss in initialmodulus decreases when sewn on polyester-cottonfabric.

  6. Modification of Biodegradable Polyesters Using Electron Beam

    Directory of Open Access Journals (Sweden)

    M. Suhartini

    2013-12-01

    Full Text Available Poly(4-Hydroxybutirat P4HB, Poly(butylene succinate-co-adipate PBSA and Poly(-caprolactone PCL were electron beam (EB-irradiated. Poly(4-Hydroxybutirat was irradiated without any polyfunctional monomers (PFM. While PBSA and PCL were irradiated in the presence of polyfunctional monomers such as Trimethallyl isocyanurate (TMAIC, Polyethyleneglycol dimethacrylate (2G, 4G, Trimethylolpropane trimethacrylate (TMPT and Tetramethylolmethane tetraacrylate (A-TMMT at ambient temperature. Aim of the study is to improve the properties of biodegradable polyester. It was pointed out that crosslinking yield of P4HB (6.39% gel was formed at dose of 90 kGy irradiated in vacuum conditions. Radiation degradation promoted, when P4HB was irradiated in air. The optimum crosslinking yield of PCL and PBSA respectively, were formed in the presence of 1% TMAIC at dose of 50 kGy. The biodegradability of the crosslinked PBSA evaluated by soil burial test is slightly retarded by increasing crosslinking yields.

  7. An Undergraduate Experiment in Polyester (PET) Synthesis

    Science.gov (United States)

    Cammidge, Andrew N.

    1999-02-01

    The most important polyester manufactured industrially is PET (polyethyleneterephthalate). We describe an experiment that conveniently mimics the industrial synthesis in the undergraduate laboratory. The first step of the reaction is a base-catalyzed transesterification between ethane diol and dimethylterephthalate. Methanol is distilled off to drive the reaction to completion. Excess ethane diol is employed to suppress formation of higher oligomers. The intermediate (bis-(2-hydroxyethyl)terephthalate) is isolated by crystallization and filtration and characterized by 1H NMR spectroscopy. In the second step the monomer is heated (with and without acid catalyst) to form polymer. Samples are removed at intervals and their physical properties are recorded as they cool. These properties are used to qualitatively monitor polymerization. This experiment reinforces some fundamental chemical concepts and introduces the students to new laboratory procedures. The students perform a distillation and apply their knowledge of the reaction equilibrium to calculate the volume of distillate (methanol) expected. The reversible nature of esterification reactions is emphasized during the polymerization step (acid-catalyzed), where the process is driven towards polymer formation by the removal (evaporation) of ethane diol.

  8. Renewable Aliphatic Polyester Block Polymer Thermoplastic Elastomers

    Science.gov (United States)

    Martello, Mark Thomas

    The performance of thermoplastic elastomers is predicated on their ability to form mechanically tough physically crosslinked elastomeric networks at low temperatures and be able to flow at elevated temperatures. This dissertation focuses on renewable aliphatic polyester block polymers with amorphous polylactide (PLA) and their performance as TPEs. The goal of this work was to enhance the mechanical toughness of PLA containing TPEs; fundamental properties ranging from chemical composition and phase behavior, molecular architecture and melt processability, to melt polymerization strategies were investigated. ABA triblock polymers with PLA end-blocks and rubbery mid-blocks from substituted lactones comprised of poly(6-methyl-epsilon-caprolactone)(PMCL), poly(delta-decalactone), and poly(epsilon-decalactone)(PDL) were produced by sequential ring-opening polymerizations in the bulk. The bulk microstructure of symmetric PLA-PMCL-PLA and PLA-PDL-PLA triblock polymers formed long-range ordered morphologies and the interaction parameter of the repeat units was determined. High molar mass triblocks exhibited elastomeric behavior with good tensile strengths and high elongations. Small triblocks were coupled to produced (PLA-PDL-PLA)n multiblock polymers with high molar mass and accessible order-disorder transitions allowing for melt processing via injection molding. The mechanical toughness of the multiblocks was comparable to the high molar mass triblocks. The controlled polymerization of renewable delta-decalactone was accomplished with an organocatalyst at low temperatures in the bulk to maximize the equilibrium conversion of the monomer.

  9. Shock Wave Profiles in Glass Reinforced Polyester

    Science.gov (United States)

    Boteler, J. Michael; Rajendran, A. M.; Grove, David

    1999-06-01

    The promise of lightweight armor which is also structurally robust is of particular importance to the Army for future combat vehicles. Fiber reinforced organic matrix composites such as Glass Reinforced Polyester (GRP) are being considered for this purpose due to their lower density and promising dynamic response. The work discussed here extends the prior work of Boteler who studied the delamination strength of GRP and Dandekar and Beaulieu who investigated the compressive and tensile strengths of GRP. In a series of shock wave experiments, the wave profile was examined as a function of propagation distance in GRP. Uniaxial strain was achieved by plate impact in the ARL 102 mm bore single-stage light gas gun. Embedded polyvinylidene flouride (PVDF) stress-rate gauges provided a stress history at three unique locations in the GRP and particle velocity history was recorded with VISAR. The use of Lagrange gauges embedded in such a manner provides a means of calculating the constitutive relationships between specific volume, stress, and particle velocity uniquely with no prior assumptions of the form of constitutive relation. The Lagrangian analysis will be discussed and compared to Lagrangian hydrocode (EPIC) results employing a model to describe the viscoelastic response of the composite material in one-dimension.

  10. Biodegradation of Polyester Polyurethane by Endophytic Fungi▿

    Science.gov (United States)

    Russell, Jonathan R.; Huang, Jeffrey; Anand, Pria; Kucera, Kaury; Sandoval, Amanda G.; Dantzler, Kathleen W.; Hickman, DaShawn; Jee, Justin; Kimovec, Farrah M.; Koppstein, David; Marks, Daniel H.; Mittermiller, Paul A.; Núñez, Salvador Joel; Santiago, Marina; Townes, Maria A.; Vishnevetsky, Michael; Williams, Neely E.; Vargas, Mario Percy Núñez; Boulanger, Lori-Ann; Bascom-Slack, Carol; Strobel, Scott A.

    2011-01-01

    Bioremediation is an important approach to waste reduction that relies on biological processes to break down a variety of pollutants. This is made possible by the vast metabolic diversity of the microbial world. To explore this diversity for the breakdown of plastic, we screened several dozen endophytic fungi for their ability to degrade the synthetic polymer polyester polyurethane (PUR). Several organisms demonstrated the ability to efficiently degrade PUR in both solid and liquid suspensions. Particularly robust activity was observed among several isolates in the genus Pestalotiopsis, although it was not a universal feature of this genus. Two Pestalotiopsis microspora isolates were uniquely able to grow on PUR as the sole carbon source under both aerobic and anaerobic conditions. Molecular characterization of this activity suggests that a serine hydrolase is responsible for degradation of PUR. The broad distribution of activity observed and the unprecedented case of anaerobic growth using PUR as the sole carbon source suggest that endophytes are a promising source of biodiversity from which to screen for metabolic properties useful for bioremediation. PMID:21764951

  11. Aliphatic polyesters for medical imaging and theranostic applications.

    Science.gov (United States)

    Nottelet, Benjamin; Darcos, Vincent; Coudane, Jean

    2015-11-01

    Medical imaging is a cornerstone of modern medicine. In that context the development of innovative imaging systems combining biomaterials and contrast agents (CAs)/imaging probes (IPs) for improved diagnostic and theranostic applications focuses intense research efforts. In particular, the classical aliphatic (co)polyesters poly(lactide) (PLA), poly(lactide-co-glycolide) (PLGA) and poly(ɛ-caprolactone) (PCL), attract much attention due to their long track record in the medical field. This review aims therefore at providing a state-of-the-art of polyester-based imaging systems. In a first section a rapid description of the various imaging modalities, including magnetic resonance imaging (MRI), optical imaging, computed tomography (CT), ultrasound (US) and radionuclide imaging (SPECT, PET) will be given. Then, the two main strategies used to combine the CAs/IPs and the polyesters will be discussed. In more detail we will first present the strategies relying on CAs/IPs encapsulation in nanoparticles, micelles, dendrimers or capsules. We will then present chemical modifications of polyesters backbones and/or polyester surfaces to yield macromolecular imaging agents. Finally, opportunities offered by these innovative systems will be illustrated with some recent examples in the fields of cell labeling, diagnostic or theranostic applications and medical devices. Copyright © 2015 Elsevier B.V. All rights reserved.

  12. Study on the Synthesis and Biodegradation of Aliphatic Polyester

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    An aliphatic polyester, poly(hexalene adipate) (PHA) and an aliphatic copolyester, poly (hexalene adipate succinate) (PHAS) were synthesized by direct condensation of corresponding binary acid and binary alcohol in the presence of a catalyst, p-toluene sulfonic acid. The biodegradation of these polyesters were studied in the laboratory by enzyme attack and outdoor soil burial. The results show that these polyesters have good biodegradability and the copolyester PHAS, even displayed a better biodegradability than the polyester PHA. In the presence of Penicillium chrysogenum the weight loss reached 18.3% for the PHAS (film thickness 1.0 mm)and 9.1% for the PHA (film thickness 1.0 mm) after 28 days. Outdoor soil burial tests indicate that these polyesters also have good biodegradability in natural conditions. The weight loss reached 14.2% for PHAS (film thickness 0.1 mm) and 6.7% for PHA (film thickness 0.1mm) after burying in soil for 36 days.

  13. Interior microelectrolysis oxidation of polyester wastewater and its treatment technology.

    Science.gov (United States)

    Yang, Xiaoyi

    2009-09-30

    This paper has investigated the effects of interior microelectrolysis pretreatment on polyester wastewater treatment and analyzed its mechanism on COD and surfactant removal. The efficiency of interior microelectrolysis is mainly influenced by solution pH, aeration and reaction time. Contaminants can be removed not only by redox reaction and flocculation in the result of ferrous and ferric hydroxides but also by electrophoresis under electric fields created by electron flow. pH confirms the chemical states of surfactants, Fe(II)/Fe(III) ratio and the redox potential, and thus influences the effects of electrophoresis, flocculation and redox action on contaminant removal. Anaerobic and aerobic batch tests were performed to study the degradation of polyester wastewater. The results imply that interior microelectrolysis and anaerobic pretreatment are lacking of effectiveness if applied individually in treating polyester wastewater in spite of their individual advantages. The interior microelectrolysis-anaerobic-aerobic process was investigated to treat polyester wastewater with comparison with interior microelectrolysis-aerobic process and anaerobic-aerobic process. High COD removal efficiencies have been gotten by the combination of interior microelectrolysis with anaerobic technology and aerobic technology. The results also imply that only biological treatment was less effective in polyester wastewater treatment.

  14. 77 FR 19619 - Certain Polyester Staple Fiber from the People's Republic of China: Extension of Preliminary...

    Science.gov (United States)

    2012-04-02

    ... International Trade Administration Certain Polyester Staple Fiber from the People's Republic of China: Extension... polyester staple fiber from the People's Republic of China (``PRC''). This review covers the period June 1... administrative review of the antidumping duty order on certain polyester staple fiber from the PRC.\\1\\...

  15. 75 FR 47795 - Certain Polyester Staple Fiber from Korea: Rescission of Antidumping Duty Administrative Review

    Science.gov (United States)

    2010-08-09

    ... International Trade Administration Certain Polyester Staple Fiber from Korea: Rescission of Antidumping Duty... (June 30, 2010). Scope of the Order Polyester staple fiber (``PSF'') covered by the scope of the order... polyesters measuring 3.3 decitex (3 denier, inclusive) or more in diameter. This merchandise is cut...

  16. 75 FR 6352 - Certain Polyester Staple Fiber from the People's Republic of China: Extension of Preliminary...

    Science.gov (United States)

    2010-02-09

    ... International Trade Administration Certain Polyester Staple Fiber from the People's Republic of China: Extension... polyester staple fiber from the People's Republic of China (``PRC''). This review covers the period June 1... duty order on certain polyester staple fiber from the PRC. See Initiation of Antidumping...

  17. 76 FR 7532 - Certain Polyester Staple Fiber From the People's Republic of China: Extension of Preliminary...

    Science.gov (United States)

    2011-02-10

    ... International Trade Administration Certain Polyester Staple Fiber From the People's Republic of China: Extension... polyester staple fiber from the People's Republic of China (``PRC''). This review covers the period June 1... duty order on certain polyester staple fiber from the PRC. See Initiation of Antidumping...

  18. 75 FR 30373 - Certain Polyester Staple Fiber From the People's Republic of China: Extension of Preliminary...

    Science.gov (United States)

    2010-06-01

    ... International Trade Administration Certain Polyester Staple Fiber From the People's Republic of China: Extension... polyester staple fiber from the People's Republic of China (``PRC''). This review covers the period June 1... polyester staple fiber from the PRC. See Initiation of Antidumping and Countervailing Duty...

  19. 75 FR 39208 - Polyester Staple Fiber from Taiwan: Final Results of Changed-Circumstances Antidumping Duty...

    Science.gov (United States)

    2010-07-08

    ... International Trade Administration Polyester Staple Fiber from Taiwan: Final Results of Changed- Circumstances... antidumping duty order on polyester staple fiber from Taiwan. DATES: Effective Date: July 8, 2010. FOR FURTHER... changed-circumstances review of the antidumping duty order on polyester staple fiber from Taiwan...

  20. 76 FR 11268 - Certain Polyester Staple Fiber From Korea and Taiwan

    Science.gov (United States)

    2011-03-01

    ... COMMISSION Certain Polyester Staple Fiber From Korea and Taiwan AGENCY: United States International Trade Commission. ACTION: Institution five-year reviews concerning the antidumping duty orders on certain polyester... whether revocation of the antidumping duty orders on certain polyester staple fiber from Korea and...

  1. 77 FR 54561 - Certain Polyester Staple Fiber From Taiwan: Final Results of Antidumping Duty Administrative Review

    Science.gov (United States)

    2012-09-05

    ...] Certain Polyester Staple Fiber From Taiwan: Final Results of Antidumping Duty Administrative Review AGENCY... antidumping duty order on certain polyester staple fiber from Taiwan. The period of review is May 1, 2010... administrative review of the antidumping duty order on certain polyester staple fiber from Taiwan. See...

  2. 75 FR 4044 - Polyester Staple Fiber From Taiwan: Initiation and Preliminary Results of Changed-Circumstances...

    Science.gov (United States)

    2010-01-26

    ... International Trade Administration Polyester Staple Fiber From Taiwan: Initiation and Preliminary Results of... antidumping duty order on polyester staple fiber from Taiwan. We have preliminarily concluded that Far Eastern... the antidumping duty order on polyester staple fiber from Taiwan. Interested parties are invited...

  3. 75 FR 51442 - Polyester Staple Fiber from Taiwan: Rescission of Antidumping Duty Administrative Review in Part

    Science.gov (United States)

    2010-08-20

    ... International Trade Administration Polyester Staple Fiber from Taiwan: Rescission of Antidumping Duty... Commerce initiated an administrative review of the antidumping duty order on polyester staple fiber from...) initiated an ] administrative review of the antidumping duty order on polyester staple fiber from...

  4. 78 FR 17637 - Polyester Staple Fiber From Taiwan: Preliminary Results of Antidumping Duty Administrative Review...

    Science.gov (United States)

    2013-03-22

    ... International Trade Administration Polyester Staple Fiber From Taiwan: Preliminary Results of Antidumping Duty... the antidumping duty order on polyester staple fiber (PSF) from Taiwan. The period of review (POR) is... Antidumping Duty Administrative Review: Polyester Staple Fiber from Taiwan'' dated concurrently with...

  5. 78 FR 14512 - Certain Polyester Staple Fiber From the People's Republic of China: Preliminary Results and...

    Science.gov (United States)

    2013-03-06

    ... International Trade Administration Certain Polyester Staple Fiber From the People's Republic of China... order on certain polyester staple fiber from the People's Republic of China (``PRC''). The period of... Sichuan Chemical Fiber Corp. and Huvis Sichuan Polyester Fiber Ltd. (``Huvis Sichuan'') are part of...

  6. 77 FR 6783 - Certain Polyester Staple Fiber From the People's Republic of China: Extension of Preliminary...

    Science.gov (United States)

    2012-02-09

    ... International Trade Administration Certain Polyester Staple Fiber From the People's Republic of China: Extension... polyester staple fiber from the People's Republic of China (``PRC''). This review covers the period June 1... administrative review of the antidumping duty order on certain polyester staple fiber from the PRC....

  7. 77 FR 62217 - Certain Polyester Staple Fiber From the People's Republic of China: Continuation of Antidumping...

    Science.gov (United States)

    2012-10-12

    ... Polyester Staple Fiber From the People's Republic of China: Continuation of Antidumping Duty Order AGENCY... certain polyester staple fiber from the People's Republic of China (``PRC'') would likely lead to a... the sunset review of the antidumping duty order on certain polyester staple fiber from the...

  8. 76 FR 58040 - Certain Polyester Staple Fiber From Korea and Taiwan

    Science.gov (United States)

    2011-09-19

    ... COMMISSION Certain Polyester Staple Fiber From Korea and Taiwan Determination On the basis of the record \\1... antidumping duty orders on certain polyester staple fiber from Korea and Taiwan would be likely to lead to...), entitled Certain Polyester Staple Fiber From Korea and Taiwan: Investigation Nos. 731-TA-825 and...

  9. 78 FR 38938 - Polyester Staple Fiber From Taiwan: Final Results of Antidumping Duty Administrative Review; 2011...

    Science.gov (United States)

    2013-06-28

    ... International Trade Administration Polyester Staple Fiber From Taiwan: Final Results of Antidumping Duty... results of the administrative review of the antidumping duty order on polyester staple fiber (PSF) from... Preliminary Results. None were received. \\1\\ See Polyester Staple Fiber From Taiwan: Preliminary Results...

  10. 21 CFR 175.260 - Partial phosphoric acid esters of polyester resins.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 3 2010-04-01 2009-04-01 true Partial phosphoric acid esters of polyester resins... COMPONENTS OF COATINGS Substances for Use as Components of Coatings § 175.260 Partial phosphoric acid esters of polyester resins. Partial phosphoric acid esters of polyester resins identified in this section...

  11. Drop Weight Impact Studies of Woven Fibers Reinforced Modified Polyester Composites

    Directory of Open Access Journals (Sweden)

    Muhammed Tijani ISA

    2014-02-01

    Full Text Available Low velocity impact tests were conducted on modified unsaturated polyester reinforced with four different woven fabrics using hand-layup method to investigate the effect of fiber type and fiber combinations. The time-load curves were analysed and scanning electron microscopy was used to observe the surface of the impacted composite laminates. The results indicated that all the composites had ductility index (DI of above two for the test conducted at impact energy of 27J with the monolithic composite of Kevlar having the highest DI. The damage modes observed were mainly matrix cracks and fiber breakages. Hybridization of the fibers in the matrix was observed to minimize these damages.

  12. On the frequency of occurrence of a peculiar polyester fibre type found in blue denim textiles.

    Science.gov (United States)

    De Wael, Kris; Baes, Christiaan; Lepot, Laurent; Gason, Fabrice

    2011-12-01

    In a double murder investigation, the victims were found after a prolonged stay in a drainage canal. In spite of the expectations, fibre examination established a multitude of primary and secondary transferred fibres. One of these fibre types was a colourless polyester fibre possessing a blue coloured molten fibre end. These matched one of the types present in the suspect's blue denim trousers. The aim of this study was to verify the rarity of this peculiar fibre type and more precisely its presence in blue denim textiles. Over five hundred different blue jeans textiles were examined and only one of these presented exactly the same type. The comparison involved microscopy, microspectrophotometry in the visible range and Raman spectroscopy. The results indicate this fibre type is extremely rare in a blue jeans fabrics and that "standard" blue denim should not be disregarded in case work.

  13. A new polyester based polymer composite for shielding soft gamma rays

    Science.gov (United States)

    Ambika, M. R.; Nagaiah, N.; Suman, S. K.

    2017-05-01

    Finely ground particulate Tungsten Oxide filled Isophthalate Polyester based polymer composites have been fabricated for different concentrations of WO3 using a simple and well established Open mould cast technique. The gamma shielding ability of the composites was studied using a gamma ray spectrometer for 80 & 127 keV gamma rays. The shielding parameters such as linear & mass attenuation coefficients, HVL and relaxation lengths were evaluated. The linear attenuation coefficient is found to increase with increase in the density of the composites. The mass attenuation coefficient ranges from 0.162 - 2.34cm2/gm and 0.15-0.89cm2/gm for 80 & 127keV gamma rays respectively. The shielding ability of the composites increases with increase in the filler wt% and decreases with increase in energy. Thus, the novel lead free, polymer composites perform well as radiation shields and their shielding ability is comparable to lead in performance.

  14. Probing the potential of polyester for CO₂ capture.

    Science.gov (United States)

    Zulfiqar, Sonia; Sarwar, Muhammad Ilyas

    2014-07-01

    Global warming, the major environmental issue confronted by humanity today, is caused by rising level of green house gases. Carbon capture and storage technologies offer potential for tapering CO₂ emission in the atmosphere. Adsorption is believed to be a promising technology for CO₂ capture. For this purpose, a polyester was synthesized by polycondensation of 1,3,5-benzenetricarbonyl trichloride and cyanuric acid in pyridine and dichloromethane mixture. The polymer was then characterized using FT-IR, TGA, BET surface area and pore size analysis, FESEM and CO₂ adsorption measurements. The CO₂ adsorption capacities of the polyester were evaluated at a pressure of 1bar and two different temperatures (273 and 298K). The performance of these materials to adsorb CO₂ at atmospheric pressure was measured by optimum CO₂ uptake of 0.244 mmol/g at 273K. The synthesized polyester, therefore, has the potential to be exploited as CO₂ adsorbent in pre-combustion capture process.

  15. Enzyme-catalysis breathes new life into polyester condensation polymerizations.

    Science.gov (United States)

    Gross, Richard A; Ganesh, Manoj; Lu, Wenhua

    2010-08-01

    Traditional chemical catalysts for polyester synthesis have enabled the generation of important commercial products. Undesirable characteristics of chemically catalyzed condensation polymerizations include the need to conduct reactions at high temperatures (150-280 degrees C) with metal catalysts that are toxic and lack selectivity. The latter is limiting when aspiring towards synthesis of increasingly complex and well-defined polyesters. This review describes an exciting technology that makes use of immobilized enzyme-catalysts for condensation polyester synthesis. Unlike chemical catalysts, enzymes function under mild conditions (< or =100 degrees C), which enables structure retention when polymerizing unstable monomers, circumvents the introduction of metals, and also provides selectivity that avoids protection-deprotection steps and presents unique options for structural control. Examples are provided that describe the progress made in enzyme-catalyzed polymerizations, as well as current limitations and future prospects for developing more efficient enzyme-catalysts for industrial processes.

  16. 溶剂法回收废旧聚酯纺织品技术%Recovery of waste polyester textiles via solvent method

    Institute of Scientific and Technical Information of China (English)

    石娜; 武志云; 汪少朋; 甘胜华

    2012-01-01

    Polyester (PET) and polyester/cotton fabrics were dissolved by dimethyl sulfoxide (DMSO) for recycled use. The results show that polyester fabric can be dissolved easily in DMSO for recovery, especially at 185 - 194 ℃ , faster dissolving is observed and dissolving can be completed within 12 minutes. Meanwhile, within certain length of time DMSO dissolves polyester but cotton fibers. Therefore, for separating and recovering, put polyester /cotton fabrics into the DMSO reagent, dissolve them at 185 - 194 ℃ for 60 minutes, then recover the cotton fibers by filtering and recover polyester from the solution at around 185 - 194 ℃. The recycled cotton fibers exhibit stable properties and find wide spectrum of applications. The intrinsic viscosity of regenerated PET increased with the increase of recovery percentage of DMSO.%利用二甲基亚砜(DMSO)溶解纯涤纶织物及涤/棉混纺织物,回收利用涤纶(PET)和棉纤维.结果表明,DMSO试剂可以回收纯涤纶织物,尤其当温度在185~194℃时DMSO与纯涤纶织物溶解反应相对较快,溶解时间为12 min.在一定反应时间内DMSO易溶解涤纶而不溶解棉纤维,可将其用于回收聚酯和棉纤维.涤/棉织物投入到温度为185~194℃的DMSO试剂中,溶解60 min,可将不溶于DMSO试剂的棉纤维在温度为185~194℃的条件下滤出并回收,同时从溶解液中回收聚酯.回收的棉纤维性能稳定,运用领域广泛.再生聚酯的特性黏度随DMSO试剂回收率的增加而增大.

  17. Biodegradation of polyester polyurethane by Aspergillus tubingensis.

    Science.gov (United States)

    Khan, Sehroon; Nadir, Sadia; Shah, Zia Ullah; Shah, Aamer Ali; Karunarathna, Samantha C; Xu, Jianchu; Khan, Afsar; Munir, Shahzad; Hasan, Fariha

    2017-03-15

    The xenobiotic nature and lack of degradability of polymeric materials has resulted in vast levels of environmental pollution and numerous health hazards. Different strategies have been developed and still more research is being in progress to reduce the impact of these polymeric materials. This work aimed to isolate and characterize polyester polyurethane (PU) degrading fungi from the soil of a general city waste disposal site in Islamabad, Pakistan. A novel PU degrading fungus was isolated from soil and identified as Aspergillus tubingensis on the basis of colony morphology, macro- and micro-morphology, molecular and phylogenetic analyses. The PU degrading ability of the fungus was tested in three different ways in the presence of 2% glucose: (a) on SDA agar plate, (b) in liquid MSM, and (c) after burial in soil. Our results indicated that this strain of A. tubingensis was capable of degrading PU. Using scanning electron microscopy (SEM), we were able to visually confirm that the mycelium of A. tubingensis colonized the PU material, causing surface degradation and scarring. The formation or breakage of chemical bonds during the biodegradation process of PU was confirmed using Attenuated Total Reflectance Fourier Transform Infrared (ATR-FTIR) spectroscopy. The biodegradation of PU was higher when plate culture method was employed, followed by the liquid culture method and soil burial technique. Notably, after two months in liquid medium, the PU film was totally degraded into smaller pieces. Based on a comprehensive literature search, it can be stated that this is the first report showing A. tubingensis capable of degrading PU. This work provides insight into the role of A. tubingensis towards solving the dilemma of PU wastes through biodegradation.

  18. Synthesis and Characterization of Aliphatic-Aromatic Hyperbranched Polyesters

    Institute of Scientific and Technical Information of China (English)

    唐黎明; 张晓龙; 邱藤; 刘德山

    2002-01-01

    Hyperbranched polymers possess special architectures and have potential applications in various areas. In this study, two AB2 monomers, dipropyl 5-(hydroxyethoxy) isophthalate (I) and 5-hydroxyethoxyisophthaic acid (II), were prepared. By bulk polycondensation of each monomer, two aliphatic-aromatic hyperbranched polyesters were prepared and characterized by 1H-nuclear magnetic resonance (1H-NMR), differential scanning calorimetry (DSC), thermogravimetry analysis (TGA), and scanning electron microscopy (SEM). Compared with all-aromatic hyperbranched polyesters, the prepared polymers showed lower glass transition temperatures in connection with the moderate decrease in their decomposition temperatures.

  19. Study on Alternating Copolymerization of Polyester-amides

    Institute of Scientific and Technical Information of China (English)

    WEI Wen-liang; LI Jian-mei; ZHU Fang-liang

    2002-01-01

    The preparing methods, choice of catalysts and reaction kinetics of one of the monomers, diesteramide(DEA), of polyester-amides were investigated in details. The chemical structure of DEA was analyzed. And the Polyester-amides (PEA) were obtained by melt copolymerization with DEA. It is shown that DEA can be synthesized by DMT and hexamethylene diamine with the catalyst EX - 1 or EX - 2. The relationship between reaction rate of synthesizing monomer and concentration of hexamethylene diamine is first order kinetic relation.

  20. Tandem synthesis of alternating polyesters from renewable resources.

    Science.gov (United States)

    Robert, Carine; de Montigny, Frédéric; Thomas, Christophe M

    2011-12-13

    The vast majority of commodity materials are obtained from petrochemical feedstocks. These resources will plausibly be depleted within the next 100 years, and the peak in global oil production is estimated to occur within the next few decades. In this regard, biomass represents an abundant carbon-neutral renewable resource for the production of polymers. Here we report a new strategy, based on tandem catalysis, to obtain renewable materials. Commercially available complexes are found to be efficient catalysts for alternating polyesters from the cyclization of dicarboxylic acids followed by alternating copolymerization of the resulting anhydrides with epoxides. This operationally simple method is an attractive strategy for the production of new biodegradable polyesters.

  1. Corrosion Protection Performance of Polyester-Melamine Coating with Natural Wood Fiber Using EIS Analysis

    Energy Technology Data Exchange (ETDEWEB)

    Shin, PyongHwa; Shon, MinYoung [Pukyong National University, Busan (Korea, Republic of); Jo, DuHwan [POSCO, Gwangyang (Korea, Republic of)

    2016-04-15

    In the present study, polyester-melamine coating systems with natural wood fiber (NWF) were prepared and the effects of NWF on the corrosion protectiveness of the polyester-melamine coating were examined using EIS analysis. From the results, higher average surface roughness was observed with increase of NWF content. Water diffusivity and water uptake into the polyester-melamine coatings with NWF were much higher than that into the pure polyester-melamine coating. The decrease in the impedance modulus |Z| was associated with the localized corrosion on carbon steel, confirming that corrosion protection of the polyester-melamine coatings with NWF well agrees with its water transport behavior.

  2. Laparoscopic-assisted Ventral Hernia Repair: Primary Fascial Repair with Polyester Mesh versus Polyester Mesh Alone.

    Science.gov (United States)

    Karipineni, Farah; Joshi, Priya; Parsikia, Afshin; Dhir, Teena; Joshi, Amit R T

    2016-03-01

    Laparoscopic-assisted ventral hernia repair (LAVHR) with mesh is well established as the preferred technique for hernia repair. We sought to determine whether primary fascial closure and/or overlap of the mesh reduced recurrence and/or complications. We conducted a retrospective review on 57 LAVHR patients using polyester composite mesh between August 2010 and July 2013. They were divided into mesh-only (nonclosure) and primary fascial closure with mesh (closure) groups. Patient demographics, prior surgical history, mesh overlap, complications, and recurrence rates were compared. Thirty-nine (68%) of 57 patients were in the closure group and 18 (32%) in the nonclosure group. Mean defect sizes were 15.5 and 22.5 cm(2), respectively. Participants were followed for a mean of 1.3 years [standard deviation (SD) = 0.7]. Recurrence rates were 2/39 (5.1%) in the closure group and 1/18 (5.6%) in the nonclosure group (P = 0.947). There were no major postoperative complications in the nonclosure group. The closure group experienced four (10.3%) complications. This was not a statistically significant difference (P = 0.159). The median mesh-to-hernia ratio for all repairs was 15.2 (surface area) and 3.9 (diameter). Median length of stay was 14.5 hours (1.7-99.3) for patients with nonclosure and 11.9 hours (6.9-90.3 hours) for patients with closure (P = 0.625). In conclusion, this is one of the largest series of LAVHR exclusively using polyester dual-sided mesh. Our recurrence rate was about 5 per cent. Significant mesh overlap is needed to achieve such low recurrence rates. Primary closure of hernias seems less important than adequate mesh overlap in preventing recurrence after LAVHR.

  3. "Nonwoven" Versus "Engineered Fabric": the Impact These Terms Have on the 15- to 25-Year-Old Females' Intent to Purchase

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    Since the fall of 2004, textile and apparel students at a United States public university have been designing apparel with nonwoven fabrics. Over the last two years, the students' designs have sparked interest in the industry which has begun to create new and innovative fabric designs. The industry, however, still struggles over the best name for the fabric. This sparked the research question, "What impact 15- to 25-year-old's intent to purchase a garment?"Through a convenience sampling method, an online questionnaire was distributed to 15- to 25-year-old United States females. The questionnaire included questions regarding demographics and psychographics, and asked respondents to choose garments they would intend to purchase based on known attributes such as style, brand,price, place, and fabrication and fiber content. There were a total of 14 garments, seven tops and seven bottoms. Four of these garments, two tops and two bottoms were constructed of nonwoven fabrics.The respondents accepted the nonwoven fabrics when shown in garments in an online setting. This demonstrates that visually, these fabrics are comparable to traditional woven and knit fabrics. The "nonwoven" polyester and nylon blend fabric increased in popularity when the respondents were told the fabrication and fiber content.However, the "engineered" polyester and polyethylene blend fabric dropped to last place when fabrication and fiber content were known. This indicates that 15- to 25-year-old respondents do not understand or are not interested in fibers or fabrications described as "engineered fabric" with a polyester/polyethylene blend. More research will have to be done to determine if the fabrication term "engineered fabric"or if the polyester/polyethylene blend fiber content caused a lack of interest or decreased intent to purchase.Research has currently begun to determine the right combination of fiber content and fiber size to develop a nonwoven fabric with an acceptable hand for apparel

  4. Drip bloodstain appearance on inclined apparel fabrics: Effect of prior-laundering, fibre content and fabric structure.

    Science.gov (United States)

    de Castro, Therese C; Carr, Debra J; Taylor, Michael C; Kieser, Jules A; Duncan, Warwick

    2016-09-01

    The interaction of blood and fabrics is currently a 'hot topic', since the understanding and interpretation of these stains is still in its infancy. A recent simplified perpendicular impact experimental programme considering bloodstains generated on fabrics laid the foundations for understanding more complex scenarios. Blood rarely impacts apparel fabrics perpendicular; therefore a systematic study was conducted to characterise the appearance of drip stains on inclined fabrics. The final drip stain appearance for 45° and 15° impact angles on torso apparel fabrics (100% cotton plain woven, 100% polyester plain woven, a blend of polyester and cotton plain woven and 100% cotton single jersey knit) that had been laundered for six, 26 and 52 cycles prior to testing was investigated. The relationship between drop parameters (height and volume), angle and the stain characteristics (parent stain area, axis 1 and 2 and number of satellite stains) for each fabric was examined using analysis of variance. The appearance of the drip stains on these fabrics was distorted, in comparison to drip stains on hard-smooth surface. Examining the parent stain allowed for classification of stains occurring at an angle, however the same could not be said for the satellite stains produced. All of the dried stains visible on the surface of the fabric were larger than just after the impacting event, indicating within fabric spreading of blood due to capillary force (wicking). The cotton-containing fabrics spread the blood within the fabrics in all directions along the stain's circumference, while spreading within the polyester plain woven fabric occurred in only the weft (width of the fabric) and warp (length) directions. Laundering affected the formation of bloodstain on the blend plain woven fabric at both impact angles, although not all characteristics were significantly affected for the three impact conditions considered. The bloodstain characteristics varied due to the fibre content

  5. Modelling the Effect of Weave Structure and Fabric Thread Density on Mechanical and Comfort Properties of Woven Fabrics

    Directory of Open Access Journals (Sweden)

    Maqsood Muhammad

    2016-09-01

    Full Text Available The paper investigates the effects of weave structure and fabric thread density on the comfort and mechanical properties of various test fabrics woven from polyester/cotton yarns. Three different weave structures, that is, 1/1 plain, 2/1 twill and 3/1 twill, and three different fabric densities were taken as input variables whereas air permeability, overall moisture management capacity, tensile strength and tear strength of fabrics were taken as response variables and a comparison is made of the effect of weave structure and fabric density on the response variables. The results of fabric samples were analysed in Minitab statistical software. The coefficients of determinations (R-sq values of the regression equations show a good predictive ability of the developed statistical models. The findings of the study may be helpful in deciding appropriate manufacturing specifications of woven fabrics to attain specific comfort and mechanical properties.

  6. A comparison of tensile properties of polyester composites reinforced with pineapple leaf fiber and pineapple peduncle fiber

    Science.gov (United States)

    Juraidi, J. M.; Shuhairul, N.; Syed Azuan, S. A.; Intan Saffinaz Anuar, Noor

    2013-12-01

    Pineapple fiber which is rich in cellulose, relatively inexpensive, and abundantly available has the potential for polymer reinforcement. This research presents a study of the tensile properties of pineapple leaf fiber and pineapple peduncle fiber reinforced polyester composites. Composites were fabricated using leaf fiber and peduncle fiber with varying fiber length and fiber loading. Both fibers were mixed with polyester composites the various fiber volume fractions of 4, 8 and 12% and with three different fiber lengths of 10, 20 and 30 mm. The composites panels were fabricated using hand lay-out technique. The tensile test was carried out in accordance to ASTM D638. The result showed that pineapple peduncle fiber with 4% fiber volume fraction and fiber length of 30 mm give highest tensile properties. From the overall results, pineapple peduncle fiber shown the higher tensile properties compared to pineapple leaf fiber. It is found that by increasing the fiber volume fraction the tensile properties has significantly decreased but by increasing the fiber length, the tensile properties will be increased proportionally. Minitab software is used to perform the two-way ANOVA analysis to measure the significant. From the analysis done, there is a significant effect of fiber volume fraction and fiber length on the tensile properties.

  7. DMF在聚酯纺织品脱色中的应用研究%Research on application of DMF for decolorization of polyester textiles

    Institute of Scientific and Technical Information of China (English)

    吴宝宅; 武志云; 汪少朋; 甘胜华

    2013-01-01

      应用N,N-二甲基甲酰胺(DMF)进行废旧有色聚酯织物脱色。结果表明:在脱色温度为140℃、织物与DMF物料配比为1︰10的条件下,用DMF处理原液着色聚酯织物10 min,织物脱色率可达30.91%;处理分散染料染色聚酯织物2 min,织物脱色率可达87.49%;应用DMF饱和蒸汽汽蒸回流脱色分散染料染色聚酯织物时脱色率更高,达99.01%。使用后的DMF可经过蒸馏回收,回收纯度为94.28%,能继续作为脱色剂使用。%  N, N—dimethyl formamide (DMF) was used for the decolorization of waste colored polyester fabric. The result showed that the decolorization rate was up to 30.91%after the fabric was treated for 10min under 140 ℃with a 1︰10 mass ratio of fabric/DMF. The decolorization rate of polyester fabrics dyed with disperse dyes was up to 87.49%after it was treated for 2 min. Higher decolorization rate of 99.01%was obtained by using refluxing steaming with DMF saturated steam for the decolorization of polyester fabrics dyed with disperse dyes. The DMF can be recycled after distillation process with the purity up to 94.28%as decolorising agent.

  8. Design of Functional Polyesters for Electronic and Biological Applications

    OpenAIRE

    Nelson, Ashley Marie

    2015-01-01

    Melt polymerization and novel monomers enabled the synthesis of polyesters for electronic and biological applications. Inspiration from nature and a passion for environmental preservation instigated an emphasis on the incorporation of renewable resources into polymeric materials. Critical analysis of current research surrounding bisphenol-A replacements and ion-containing segmented polyurethanes aided in identifying benchmark polymers, including limitations, challenges, and future needs. S...

  9. Solubilities of sub- and supercritical carbon dioxide in polyester resins

    NARCIS (Netherlands)

    Nalawade, SP; Picchioni, F; Janssen, LPBM; Patil, VE; Keurentjes, JTF; Staudt, R; Nalawade, Sameer P.; Patil, Vishal E.; Keurentjes, Jos T.F.

    In supercritical carbon dioxide (CO2) assisted polymer processes the solubility of CO2 in a polymer plays a vital role. The higher the amount of CO2 dissolved in a polymer the higher is the viscosity reduction of the polymer. Solubilities Of CO2 in polyester resins based on propoxylated bisphenol

  10. Lipase-catalyzed polyester synthesis--a green polymer chemistry.

    Science.gov (United States)

    Kobayashi, Shiro

    2010-01-01

    This article is a short comprehensive review describing in vitro polyester synthesis catalyzed by a hydrolysis enzyme of lipase, most of which has been developed for these two decades. Polyesters are prepared by repeated ester bond-formation reactions; they include two major modes, ring-opening polymerization (ROP) of cyclic monomers such as cyclic esters (lactones) and condensation polymerization via the reaction between a carboxylic acid or its ester group and an alcohol group. Polyester synthesis is, therefore, a reaction in reverse way of in vivo lipase catalysis of ester bond-cleavage with hydrolysis. The lipase-catalyzed polymerizations show very high chemo-, regio-, and enantio-selectivities and involve various advantageous characteristics. Lipase is robust and compatible with other chemical catalysts, which allows novel chemoenzymatic processes. New syntheses of a variety of functional polyesters and a plausible reaction mechanism of lipase catalysis are mentioned. The polymerization characteristics are of green nature currently demanded for sustainable society, and hence, desirable for conducting 'green polymer chemistry'.

  11. Propagation of polarized light through azobenzene polyester films

    DEFF Research Database (Denmark)

    Nedelchev, L; Matharu, A; Nikolova, Ludmila

    2002-01-01

    When elliptically polarized light of appropriate wavelength Corresponding to trans-cis-trans isomerisation process is incident on thin films of azobenzene polyesters, a helical structure is induced. We investigate the propagation of the exciting light beam (self-induced) as well as a probe light...

  12. Adsorption of proteins from plasma at polyester non-wovens

    NARCIS (Netherlands)

    Klomp, A.J.A.; Engbers, G.H.M.; Mol, J.; Terlingen, J.G.A.; Feijen, J.

    1999-01-01

    Polyester non-wovens in filters for the removal of leukocytes from platelet concentrates (PCs) must be platelet compatible. In PC filtration, the adsorption of proteins at the plasma–non-woven interface can be of great importance with respect to the yield of platelets. Unmodified and radio frequency

  13. Lipase-catalyzed polyester synthesis – A green polymer chemistry

    Science.gov (United States)

    Kobayashi, Shiro

    2010-01-01

    This article is a short comprehensive review describing in vitro polyester synthesis catalyzed by a hydrolysis enzyme of lipase, most of which has been developed for these two decades. Polyesters are prepared by repeated ester bond-formation reactions; they include two major modes, ring-opening polymerization (ROP) of cyclic monomers such as cyclic esters (lactones) and condensation polymerization via the reaction between a carboxylic acid or its ester group and an alcohol group. Polyester synthesis is, therefore, a reaction in reverse way of in vivo lipase catalysis of ester bond-cleavage with hydrolysis. The lipase-catalyzed polymerizations show very high chemo-, regio-, and enantio-selectivities and involve various advantageous characteristics. Lipase is robust and compatible with other chemical catalysts, which allows novel chemo-enzymatic processes. New syntheses of a variety of functional polyesters and a plausible reaction mechanism of lipase catalysis are mentioned. The polymerization characteristics are of green nature currently demanded for sustainable society, and hence, desirable for conducting ‘green polymer chemistry’. PMID:20431260

  14. Blends of Amphiphilic, Hyperbranched Polyesters and Different Polyolefins

    NARCIS (Netherlands)

    Schmaljohann, D.; Pötschke, P.; Hässler, R.; Voit, B.I.; Froehling, P.E.; Mostert, B.; Loontjens, J.A.

    1999-01-01

    A hyperbranched polyester based on 3,5-dihydroxybenzoic acid was completely modified with dodecanoyl chloride to result in an amphiphilic, globular polymer, which has a polar core and a nonpolar outer sphere with the ability both to incorporate an organic dye and to interact with a nonpolar matrix.

  15. Liquid Crystalline Furandicarboxylic Acid-based Aaromatic Polyesters

    NARCIS (Netherlands)

    WILSENS, CAROLUS HENRICUS R. MARIA; RASTOGI, SANJAY; VELD, MARTIJN ARNOLDUS JOHANNES; KLOP, ENNO ANTON; NOORDOVER, BART ADRIANUS JOHANNES

    2013-01-01

    The invention pertains to a fully aromatic liquid crystalline furandicarboxylic acid- based aromatic polyester obtainable from a mixture of monomers comprising 2,5- furandicarboxylic acid, p-hydroxybenzoic acid, an aromatic diol, and 5-40 mol% of an aromatic monocarboxylic acid selected from vanilli

  16. Advanced microgel-functionalized polyester textiles adaptive to ambient conditions

    NARCIS (Netherlands)

    Glampedaki, Pelagia

    2011-01-01

    A new approach toward textile-based multi-functional and stimuli-responsive materials is proposed. Polyelectrolyte microgel technology is combined with conventional functionalization methods of photo- and thermo-crosslinking to activate the surface of polyester textiles, making them interactive with

  17. Photoinduced Circular Anisotropy in Side-Chain Azobenzene Polyesters

    DEFF Research Database (Denmark)

    Nikolova, L.; Todorov, T.; Ivanov, M.;

    1997-01-01

    We report for the first time the inducing of large circular anisotropy in previously unoriented films of side-chain azobenzene polyesters on illumination with circularly polarized light at a wavelength of 488 nm. The circular dichroism and optical activity are measured simultaneously in real time...

  18. Solubilities of sub- and supercritical carbon dioxide in polyester resins

    NARCIS (Netherlands)

    Nalawade, SP; Picchioni, F; Janssen, LPBM; Patil, VE; Keurentjes, JTF; Staudt, R; Nalawade, Sameer P.; Patil, Vishal E.; Keurentjes, Jos T.F.

    2006-01-01

    In supercritical carbon dioxide (CO2) assisted polymer processes the solubility of CO2 in a polymer plays a vital role. The higher the amount of CO2 dissolved in a polymer the higher is the viscosity reduction of the polymer. Solubilities Of CO2 in polyester resins based on propoxylated bisphenol (P

  19. Microcellular processing of polylactide-hyperbranched polyester-nanoclay composites

    Science.gov (United States)

    Srikanth Pilla; Adam Kramschuster; Jungjoo Lee; Craig Clemons; Shaoqin Gong; Lih-Sheng Turng

    2010-01-01

    The effects of addition of hyperbranched polyesters (HBPs) and nanoclay on the material properties of both solid and microcellular polylactide (PLA) produced via a conventional and microcellular injection-molding process, respectively, were investigated. The effects of two different types of HBPs (i.e., Boltorn H2004® and Boltorn H20®) at the same...

  20. MERSILENE (POLYESTER), A NEW SUTURE FOR PENETRATING KERATOPLASTY

    NARCIS (Netherlands)

    RAMSELAAR, JAM; BEEKHUIS, WH; RIJNEVELD, WJ; VANANDEL, MV; DIJK, F; JONGEBLOED, WL

    1992-01-01

    Mersilene (polyester monofilament) seems to be suitable for penetrating keratoplasty because it is strong, shows no degradation by ultraviolet light, is insoluble, so that it can be left in situ, and offers the possibility of regulating postoperative astigmatism by suture adjustment. In 12 patients

  1. Highly Branched Bio-Based Unsaturated Polyesters by Enzymatic Polymerization

    Directory of Open Access Journals (Sweden)

    Hiep Dinh Nguyen

    2016-10-01

    Full Text Available A one-pot, enzyme-catalyzed bulk polymerization method for direct production of highly branched polyesters has been developed as an alternative to currently used industrial procedures. Bio-based feed components in the form of glycerol, pentaerythritol, azelaic acid, and tall oil fatty acid (TOFA were polymerized using an immobilized Candida antarctica lipase B (CALB and the potential for an enzymatic synthesis of alkyds was investigated. The developed method enables the use of both glycerol and also pentaerythritol (for the first time as the alcohol source and was found to be very robust. This allows simple variations in the molar mass and structure of the polyester without premature gelation, thus enabling easy tailoring of the branched polyester structure. The postpolymerization crosslinking of the polyesters illustrates their potential as binders in alkyds. The formed films had good UV stability, very high water contact angles of up to 141° and a glass transition temperature that could be controlled through the feed composition.

  2. Fabricating Superhydrophobic Polymeric Materials for Biomedical Applications

    Science.gov (United States)

    Kaplan, Jonah; Grinstaff, Mark

    2015-01-01

    Superhydrophobic materials, with surfaces possessing permanent or metastable non-wetted states, are of interest for a number of biomedical and industrial applications. Here we describe how electrospinning or electrospraying a polymer mixture containing a biodegradable, biocompatible aliphatic polyester (e.g., polycaprolactone and poly(lactide-co-glycolide)), as the major component, doped with a hydrophobic copolymer composed of the polyester and a stearate-modified poly(glycerol carbonate) affords a superhydrophobic biomaterial. The fabrication techniques of electrospinning or electrospraying provide the enhanced surface roughness and porosity on and within the fibers or the particles, respectively. The use of a low surface energy copolymer dopant that blends with the polyester and can be stably electrospun or electrosprayed affords these superhydrophobic materials. Important parameters such as fiber size, copolymer dopant composition and/or concentration, and their effects on wettability are discussed. This combination of polymer chemistry and process engineering affords a versatile approach to develop application-specific materials using scalable techniques, which are likely generalizable to a wider class of polymers for a variety of applications. PMID:26383018

  3. Polyester Textiles as a Source of Microplastics from Households: A Mechanistic Study to Understand Microfiber Release During Washing.

    Science.gov (United States)

    Hernandez, Edgar; Nowack, Bernd; Mitrano, Denise M

    2017-06-20

    Microplastic fibers make up a large proportion of microplastics found in the environment, especially in urban areas. There is good reason to consider synthetic textiles a major source of microplastic fibers, and it will not diminish since the use of synthetic fabrics, especially polyester, continues to increase. In this study we provide quantitative data regarding the size and mass of microplastic fibers released from synthetic (polyester) textiles during simulated home washing under controlled laboratory conditions. Consideration of fabric structure and washing conditions (use of detergents, temperature, wash duration, and sequential washings) allowed us to study the propensity of fiber shedding in a mechanistic way. Thousands of individual fibers were measured (number, length) from each wash solution to provide a robust data set on which to draw conclusions. Among all the variables tested, the use of detergent appeared to affect the total mass of fibers released the most, yet the detergent composition (liquid or powder) or overdosing of detergent did not significantly influence microplastic release. Despite different release quantities due to the addition of a surfactant (approximately 0.025 and 0.1 mg fibers/g textile washed, without and with detergent, respectively), the overall microplastic fiber length profile remained similar regardless of wash condition or fabric structure, with the vast majority of fibers ranging between 100 and 800 μm in length irrespective of wash cycle number. This indicates that the fiber staple length and/or debris encapsulated inside the fabric from the yarn spinning could be directly responsible for releasing stray fibers. This study serves as a first look toward understanding the physical properties of the textile itself to better understand the mechanisms of fiber shedding in the context of microplastic fiber release into laundry wash water.

  4. Effect of alkaline solutions on the tensile properties of glass-polyester pipes

    Directory of Open Access Journals (Sweden)

    Putić Slaviša S.

    2011-01-01

    Full Text Available Construction materials, traditionally used in process equipment, are today successfully replaced by composite materials. Hence, many pipes are made of these materials. The subject of this study was the influence of liquids on the state of stresses and tensile strengths in the longitudinal and circumferential direction of glass-polyester pipes of a definite structure and known fabrication process. These analyses are of great importance for the use of glass-polyester pipes in the chemical industry. The tensile properties (the ultimate tensile strength and the modulus of elasticity were tested and determined for specimens cut out of the pipes; flat specimens for the tensile properties in the longitudinal direction and ring specimens for the tensile properties in the circumferential direction. First, the tension test was performed on virgin samples (without the influence of any liquid, to obtain knowledge about the original tensile properties of the material composite studied. Subsequently, the specimens were soaked in alkaline solutions: sodium hydroxide (strong alkali and ammonium hydroxide (weak alkali. These solutions were selected because of their considerable difference in pH values. The specimens and rings were left for 3, 10, 30 and 60 days in each liquid at room temperature. Then, the samples were tested on tension by the standard testing procedure. A comparison of the obtained results was made based on the pH values of the aggressive media in which the examined material had been soaked, as well as based on the original tensile properties and the number of days of treatment. Micromechanical analyses of sample breakage helped in the elucidation of the influence of the liquids on the structure of the composite pipe and enabled models and mechanisms that produced the change of strength to be proposed.

  5. The influence of molecular structure on the hydrolysability of unsaturated polyester resins; Influence de la structure moleculaire sur l`hydrolysabilite des resines polyester insature

    Energy Technology Data Exchange (ETDEWEB)

    Spiteri, P.; Denis, V.; Fontanille, M.; Villenave, J.J.

    1993-04-01

    The influence of the structure of polyester resins on their water absorption processes has been evidenced. Correlations have been established between the kinetics of the absorption of water and the hydrolytic degradation of the materials. They allow to propose a method for predicting the life time of unsaturated polyester materials. (authors). 1 tab., 5 figs., 5 refs.

  6. Antibacterial property of fabrics coated by magnesium-based brucites

    Science.gov (United States)

    Wang, Ying; Sha, Lin; Zhao, Jiao; Li, Qian; Zhu, Yimin; Wang, Ninghui

    2017-04-01

    A kind of environmental-friendly magnesium-based antibacterial agent was reported for the first time, which was composited by brucites with different particle sizes. The antibacterial fabrics were produced by coating the magnesium-based antibacterial agents on the 260T polyester pongee fabrics with waterborne polyurethane. The coating process was simple, low-cost, and harmless to human health and environment. Characteristics of the antibacterial agents and fabrics were studied by particulate size distribution analyzer (PSDA), X-ray diffraction (XRD), and scanning electron microscopy (SEM). The results demonstrated that the coating layer was covered tightly on the fabrics and compositing of different particles by a certain proportion made full filling of the coating layer. Meanwhile, compositing did not change the structure of brucites. The antibacterial fabrics presented strong antibacterial properties against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus), with the reduction percentage of 96.6% and 100%, respectively, and the antibacterial fabrics attained excellent washing durability.

  7. Development of Moisture Absorbable and Breathable Reversible Polyester Cloth%吸湿排汗涤纶双面织物的开发

    Institute of Scientific and Technical Information of China (English)

    张素俭; 吴春燕; 高伟良

    2012-01-01

    Design methods and production key points of moisture absorbable and breathable reversible polyester cloth were discussed. Moisture absorbable and breathable polyester blended yarn was used as inner layer and cotton yarn was used as surface layer, reversible jacquard fabric was designed. Fabric moisture adsorption was tested and analyzed. The result shows that reed width should be designed rationally to ensure fabric width. Soaping was strengthened to make full use of moisture adsorption effect. Finally compared to related standard, it is considered that fabric moisture adsorp tion is better,design and production demands can be reached.%探讨吸湿排汗涤纶双面织物的设计方法与生产要点.以吸湿排汗涤纶纤维混纺纱为里层、以棉纱为表层,按纬起花组织设计开发了双面织物.通过试验测试分析了织物的吸湿排汗性能,结果表明:该织物上机时筘幅应合理设计,以保证成品幅宽;整理时加大皂洗力度,以充分发挥吸湿排汗的效果.最后与相关标准进行对比,认为该织物吸湿排湿性能良好,达到了设计及生产要求.

  8. Releasing dye encapsulated in proteinaceous microspheres on conductive fabrics by electric current.

    Science.gov (United States)

    Shimanovich, Ulyana; Perelshtein, Ilana; Cavaco-Paulo, Artur; Gedanken, Aharon

    2012-06-27

    The current paper reports on the relase properties of conductive fabrics coated with proteinaceous microspheres containing a dye. The release of the dye was achieved by passing an electric current through the fabric. The conductivity of the polyester fibers resulted from nanosilver (Ag NPs) coated on the surface of these fibers. Both types of coatings (nanosilver coating and the coating of the proteinaceous microspheres) were performed using high-intensity ultrasonic waves. Two different types of dyes, hydrophilic RBBR (Remazol Brilliant Blue R) and hydrophobic ORO (Oil Red O), were encapsulated inside the microspheres (attached to the surface of polyester) and then released by applying an electric current. The Proteinaceous Microsphere (PM)-coated conductive fabrics could be used in medicine for drug release. The encapsulated dye can be replaced with a drug that could be released from the surface of fabrics by applying a low voltage.

  9. Mechanical Behaviour of Aluminium Dispersed Unsaturated Polyester/Jute Composites for Structural Applications

    Science.gov (United States)

    Biswas, Bhabatosh; Chabri, Sumit; Mitra, Bhairab Chandra; Bandyopadhyay, Nil Ratan; Sinha, Arijit

    2016-07-01

    The fibrous filler Jute along with Al particle reinforced unsaturated polyester composites having different filler (both Jute and Al were in equal wt%) were fabricated by compression molding technique. The variation of loading was taken as 2, 5, 10 and 15 wt% in the fabricated composites. In present investigation, it was observed that with fillers (Jute and Al) incorporation the microhardness increases and become optimum at 10 wt% of fillers content followed by slight deterioration at 15 wt%. Structural investigation through scanning electron microscopy and X-ray diffraction confirm the dispersion of the fillers within the composites. An improvement of crystallinity % of the matrix with filler addition was observed as predicted from X-ray diffraction technique. The results of tensile testing shows that the strength and modulus increase monotonically up to 10 wt% of filler addition followed by slight decreases at 15 wt% of the same. The scratch result shows the optimization of strength and toughness of the composites with filler content of 10 wt%.

  10. Synthesis and application of hydrophilic polyester finishing agent modified by silicone%有机硅改性亲水聚酯整理剂的合成及应用

    Institute of Scientific and Technical Information of China (English)

    杨安明; 周向东; 刘军辉

    2011-01-01

    Hydrophilic polyester finishing agent modified by silicone was prepared with dimethyl terephtha-late (DMT), poly (ethylene glycol) (PEG), ethylene glycol (EG) and hydroxyl silicone oil, then applied to hydrophilic finishing of polyester fabric. The influences of DMT dosage, hydroxyl silicone oil dosage and the polycondensation reaction time on the performance of synthetic product was discussed. The structure and performance of the hydrophilic polyester modified silicone were characterized by FT-IR, 'H-NMR, TG-DTA and SEM. The results showed that the time of water absorption and static half-life of the finished polyester fabric was 11.5 s and 4.0 s, respectively, and the handle scores was 8.5, the finished polyester fabric had good hydroscopic property and softness. After 30 times of laundering, the time of water absorption and the static half-life of finished fabric could still reach 13.0 s and 6.0 s, respectively, and the handle scores was 8.0. The synthetic finishing agent could endow polyester fabric with durable hydroscopic property and softness.%以对苯二甲酸二甲酯(DMT)、聚乙二醇(PEG)、乙二醇(EG)以及羟基硅油为原料合成了有机硅改性亲水聚酯整理剂,并用于涤纶织物的亲水整理.讨论了ω(DMT)、ω(羟基硅油)以及缩聚反应时间对合成产物性能的影响,通过红外光谱仪(FT-IR)、核磁共振(1H-NMR)、热性能分析(TG-DTA)和扫描电镜(SEM)测试,表征了有机硅改性亲水聚酯的结构和性能.结果表明:经有机硅改性亲水聚酯整理的涤纶织物,水滴吸收时间和静电半衰期分别为11.5 s和4.0 s,手感分数为8.5,具有良好的吸湿性和柔软性,水洗30次后水滴吸收时间和静电半衰期仍可达到13.0 s和6.0 s,手感分数为8.0,能赋予织物较耐久的吸湿性和柔软性.

  11. Evaluation Study of Glass Fiber Reinforced Polyester and Kevlar Reinforced Polyester by Taguchi Method

    Directory of Open Access Journals (Sweden)

    Osama Sultan M.

    2012-01-01

    Full Text Available In the present investigation two different types of fiber reinforced polymer composites were prepared by hand lay-up method using three different parameters (curing temperature, pressing load and fiber volume fraction. These composites were prepared from the polyester resin as the matrix material reinforced with glass fibers as first group of samples and mat Kevlar fibers as the second group, both with different volume fractions (4%, 8%, and 12% of fibers. They were then tested by tensile strength and impact strength. The main objective in this study is to use Taguchi method for predicting the better parameters that give the better tensile and impact strength to the composites, and then preparing composites at these parameters and comparing them with the randomly used once. The experimental and analytical results showed that the Taguchi method was successful in optimizing the parameters that give the highest properties and it can find the most influential parameter regardless of the material used. Also it showed that the volume fraction was the most influential parameter on the tensile and impact strength. The difference between these composites was in the properties values and that the Kevlar composites have higher tensile and impact strength.

  12. STUDY ON SYNTHESIS AND RELAXIVITY OF PARAMAGNETIC POLYESTER METAL COMPLEXES FOR MRI

    Institute of Scientific and Technical Information of China (English)

    Ouyangming; ZhuoRenxi; 等

    1995-01-01

    Fifteen new polyester ligands were prepared by copolymerization of EDTA (ethylenediaminetertraacetic acid)dianhydride or DTPA (diethylenetriamine pentaacetic acid) dianhydride and dihydric alcohol or dihydric phenol.Their paramagnetic metal complexes were also synthesized.All polyester ligands and metal complexes were characterized by 1HNMR,IR spectra and elemental analyses.Preliminary study showed that the polyester metal complexes had higher relaxation effectiveness as compared to corresponding small molecular metal complexes.

  13. Transcaval access for TAVR across a polyester aortic graft.

    Science.gov (United States)

    Lederman, Robert J; O'Neill, William W; Greenbaum, Adam B

    2015-06-01

    Transcaval access to the aorta allows transcatheter aortic valve replacement in patients without other good access options. The resulting aorto-caval fistula is closed with a nitinol cardiac occluder device. There is no experience traversing a synthetic aortic graft to perform transcaval access and closure. We describe a patient who underwent successful traversal of a polyester aortic graft using radiofrequency energy applied from the tip of a guidewire, to allow retrograde transcatheter aortic valve replacement from a femoral vein, along with details of our technique. The patient did well and was discharged home after 3 days. There was residual aorto-caval fistulous flow immediately after implantation of a polyester-seeded nitinol muscular ventricular septal defect occluder device, but this fistula spontaneously occluded within one month.

  14. Drilling analysis of coir–fibre-reinforced polyester composites

    Indian Academy of Sciences (India)

    S Jayabal; U Natarajan

    2011-12-01

    An investigation has been carried out to make use of coir, a natural fibre abundantly available in India. Coir–polyester composites were prepared and their mechanical and machinability characteristics were studied. The short coir–fibre-reinforced composites exhibited the tensile, flexural and impact strength of 16.1709 MPa, 29.2611 MPa and 46.1740 J/m, respectively. The regression equations were developed and optimized for studying drilling characteristics of coir–polyester composites using the Taguchi approach. A drill bit diameter of 6 mm, spindle speed of 600 rpm and feed rate of 0.3 mm/rev gave the minimum value of thrust force, torque and tool wear in drilling analysis.

  15. Recent developments in lipase-catalyzed synthesis of polyesters.

    Science.gov (United States)

    Kobayashi, Shiro

    2009-02-18

    Polyester synthesis by lipase catalyst involves two major polymerization modes: i) ring-opening polymerization of lactones, and, ii) polycondensation. Ring-opening polymerization includes the finding of lipase catalyst; scope of reactions; polymerization mechanism; ring-opening polymerization reactivity of lactones; enantio-, chemo- and regio-selective polymerizations; and, chemoenzymatic polymerizations. Polycondensation includes polymerizations involving condensation reactions between carboxylic acid and alcohol functional groups to form an ester bond. In most cases, a carboxylic acid group is activated as an ester form, such as a vinyl ester. Many recently developed polymerizations demonstrate lipase catalysis specific to enzymatic polymerization and appear very useful. Also, since lipase-catalyzed polyester synthesis provides a good opportunity for conducting "green polymer chemistry", the importance of this is described.

  16. Rear Bumper Laminated In Jute Fiber With Polyester Resin.

    Directory of Open Access Journals (Sweden)

    Braga, R. A

    2014-09-01

    Full Text Available Today, a growing interest exists in the use of natural of fibers (sisal, coconut, banana, and jute, as reinforcement in composites. The aim of the present study is shows the use of jute fiber agglutinated with polyester resin in the automobile industry in the production of a rear bumper of hatch vehicle. A simplified mathematical model was used for evaluation of the flaw on trunk center cover submitted to dynamic loads. The traverse section of the referred bumper is simplified by a channel formation. This study shows that a rear bumper made using jute fiber agglutinated with polyester resin will be possible. The molded part obtained good visual characteristics, good geometric construction and surface without bubbles and imperfections in the fiber and resin composite. The mathematical model to failure criterion showed that the rear bumper in jute fiber will not resist to an impact equivalent at 4.0 km/h.

  17. Neutron shielding performance of water-extended polyester

    Energy Technology Data Exchange (ETDEWEB)

    Vega Carrillo, H.R.; Manzanares-Acuna, E.; Hernandez-Davila, V.M. [Zacatecas Univ. Autonoma, Nuclear Studies (Mexico); Vega Carrillo, H.R.; Hernandez-Davila, V.M. [Zacatecas Univ. Autonoma, Electric Engineering Academic Units (Mexico); Gallego, E.; Lorente, A. [Madrid Univ. Politecnica, cNuclear Engineering Department (Mexico)

    2006-07-01

    A Monte Carlo study to determine the shielding features to neutrons of water-extended polyester (WEP) was carried out. Materials with low atomic number are predominantly used for neutron shielding because these materials effectively attenuate neutrons, mainly through elastic and inelastic collisions. In addition to neutron attenuation properties, other desirable properties for neutron shielding materials include mechanical strength, stability, low cost, and ease of handling. During the selection of materials to design a neutron shield, prompt gamma production as well as radionuclide induced by neutron activation must be considered. In this investigation the Monte Carlo method (MCNP code) was used to evaluate the performance of a water-extended polyester shield designed for the transportation, storage, and use of a {sup 252}Cf isotopic neutron source, for comparison the calculations were extended to water shielding, the bare source in vacuum and in air. (authors)

  18. Tensile strength of woven yarn kenaf fiber reinforced polyester composites

    Directory of Open Access Journals (Sweden)

    A.E. Ismail

    2015-12-01

    Full Text Available This paper presents the tensile strength of woven kenaf fiber reinforced polyester composites. The as-received yarn kenaf fiber is weaved and then aligned into specific fiber orientations before it is hardened with polyester resin. The composite plates are shaped according to the standard geometry and uni-axially loaded in order to investigate the tensile responses. Two important parameters are studied such as fiber orientations and number of layers. According to the results, it is shown that fiber orientations greatly affected the ultimate tensile strength but it is not for modulus of elasticity for both types of layers. It is estimated that the reductions of both ultimate tensile strength and Young’s modulus are in the range of 27.7-30.9% and 2.4-3.7% respectively, if the inclined fibers are used with respect to the principal axis.

  19. Functional bio-based polyesters by enzymatic polymerization

    DEFF Research Database (Denmark)

    Daugaard, Anders Egede; Hoffmann, Christian; Andersen, Christian

    During recent years enzymatic polymerization has become increasingly popular as an alternative to classical polyesterification processes. The high regioselectivity observed for lipases permits preparation of novel polyesters with a high number of functional groups.1 This is particularly interesting...... polymerization was applied to prepare functional water soluble polyesters based on dimethyl itaconate and poly(ethyleneglycol).2 The monomer permits postfunctionalization using thiol-ene chemistry or aza-michael additions, which was used to illustrate the possibilites of preparing functional hydrogels. Hydrogels...... was copolymerized together with ethyl-6-hydroxyhexanoate yielding copolymers with molecular weights of up to 12,000 g/mol. The polymers were postfunctionalized using trifluoroacetic anhydride, which resulted in 100% conversion of the secondary alcohols, illustrating the possibility to use the secondary alcohol...

  20. Fiberglass wastes/polyester resin composites: mechanical properties and water sorption

    Directory of Open Access Journals (Sweden)

    Edcleide M. Araújo

    2006-12-01

    Full Text Available The mechanical properties of polyester/fiberglass composites were studied. The aim of this work was to evaluate the possibility of reusing the wastes taken from spray-up processing of Paraíba state Industries as reinforcement in polyester matrix composites. Composites with 20, 30, 40, 50 and 60 wt. (% of recycled fiberglass were prepared by compression molding and compared with polyester/ virgin glass fiber composites. The mechanical properties and water sorption behavior were evaluated. The results showed that fiberglass wastes are promising to be reused in polyester resin composites. The impact strength was excellent. It can be concluded that the reusing of the fiberglass wastes is viable.

  1. Healthy Functions and Mechanisms of Bamboo-Charcoal Modified Polyesters

    Institute of Scientific and Technical Information of China (English)

    WANG Qi; HE Shu-cai

    2007-01-01

    In this paper, healthy fuactions and mechanismof bamboo-charcoal modified polyesters arc studied. Theresults show that there are five healthy functionsincorporated effectively in bamboo-charcoal modifiedpolyesters, such as good far-lnfrared radiation, good UVprotection, certain negative ion emission, certain anti-bacteria and good absorption functions. The metal elementsand carburets are mainly responsible for far-infrared,negative ion emission functions. UV prevention functionresults mainly from the carbon elements. The absorbabilityand bacteriostasis functions lie in the porous structures.

  2. SYNTHESIS AND CHARACTERIZATION OF AN ORDERED LADDER POLYESTER

    Institute of Scientific and Technical Information of China (English)

    Ping-ping Zhang; Tao-yi Zhang; Chuan-feng Zhu; Yu-xia Diao; You-zhi Wan; Ping Xie; Rong-ben Zhang

    2006-01-01

    An ordered ladder polyester (LPE) was first synthesized through the ladder superstructure (LS) constructed by concerted interactions of hydroxyl- and aramide-based H-bonding and p-terphenyl (TP)-based π-stacking by dehydrochlorination condensation using phosgene (COCl2) as coupling agent. LPE was characterized by GPC, FTIR, NMR,XRD, DSC and AFM. Among them, a distinct image of regularly linear alignment corresponding to the ladder main chain of LPE was first revealed by high-resolution AFM.

  3. Thermally-responsive poly(ester urethane)s

    Science.gov (United States)

    Pierce, Benjamin Franklin

    Thermally-responsive materials are quite useful in the biomedical field, but their full potential has yet to be realized. For example, polyurethanes are capable of exhibiting shape-memory properties, or the ability to change shape upon the application of a stimulus, but only a few practical thermally responsive polyurethanes have been reported due to the lack of novel starting materials and optimized systems. This work describes the synthesis of several degradable polymers and the characterization of their thermally responsive behavior. First, several amorphous polyester prepolymers are synthesized and incorporated in thermoplastic poly(ester urethane)s, which are highly elastic but display impractical thermal properties. Their potential as degradable implants is investigated, as well as their bulk and surface properties. These systems are then optimized and tailored for more practical purposes, resulting in the synthesis of thermoset elastomers based on poly(1,4-cyclohexanedimethanol 1,4-cyclohexanedicarboxylate) (PCCD) prepolymers that display a broad range of useful mechanical properties, thermal properties, and shape-memory properties. A novel method for controlling a microscopic and nanoscopic topographical shape-memory phenomenon is presented. Finally, the synthesis of amine-functionalized polyesters is presented. All materials are characterized by 1H and 13C NMR, GPC, DSC, TGA, and Instron.

  4. Mechanical Characterization of Cotton Fiber/Polyester Composite Material

    Directory of Open Access Journals (Sweden)

    Altaf Hussain Rajper

    2014-04-01

    Full Text Available Development of composite from natural fiber for lower structural application is growing for long-term sustainable perspective. Cotton fiber composite material has the added advantages of high specific strength, corrosion resistance, low cost and low weight compared to glass fiber on the expense of internal components of IC engines. The primary aim of the research study is to examine the effect of the cotton fiber on mechanical properties of lower structural applications when added with the polyester resin. In this paper composite material sample has been prepared by hand Lay-Up process. A mould is locally developed in the laboratory for test sample preparation. Initially samples of polyester resin with appropriate ratio of the hardener were developed and tested. At the second stage yarns of cotton fiber were mixed with the polyester resin and sample specimens were developed and tested. Relative effect of the cotton as reinforcing agent was examined and observed that developed composite specimen possess significant improvement in mechanical properties such as tensile strength was improved as 19.78 % and modulus of elasticity was increased up to 24.81%. Through this research it was also observed that developed composite material was of ductile nature and its density decreases up to 2.6%. Results from this study were compared with relevant available advanced composite materials and found improved mechanical properties of developed composite material

  5. Corrosion inhibition property of polyester-groundnut shell biodegradable composite.

    Science.gov (United States)

    Sounthari, P; Kiruthika, A; Saranya, J; Parameswari, K; Chitra, S

    2016-12-01

    The use of natural fibers as reinforcing materials in thermoplastics and thermoset matrix composites provide optimistic environmental profits with regard to ultimate disposability and better use of raw materials. The present work is focused on the corrosion inhibition property of a polymer matrix composite produced by the use of groundnut shell (GNS) waste. Polyester (PE) was synthesized by condensation polymerization of symmetrical 1,3,4-oxadiazole and pimelic acid using sodium lauryl sulfate as surfactant. The polyester-groundnut shell composite (PEGNS) was prepared by ultrasonication method. The synthesized polyester-groundnut shell composite was characterized by FT-IR, TGA and XRD analysis. The corrosion inhibitory effect of PEGNS on mild steel in 1M H2SO4 was investigated using gravimetric method, electrochemical impedance spectroscopy, potentiodynamic polarization, atomic absorption spectroscopy and scanning electron microscopy. The results showed that PEGNS inhibited mild steel corrosion in acid solution and indicated that the inhibition efficiency increased with increasing inhibitor concentration and decrease with increasing temperature. The composite inhibited the corrosion of mild steel through adsorption following the Langmuir adsorption isotherm. Changes in the impedance parameters Rt, Cdl, Icorr, Ecorr, ba and bc suggested the adsorption of PEGNS onto the mild steel surface, leading to the formation of protective film.

  6. The effect of autoclave resterilisation on polyester vascular grafts.

    Science.gov (United States)

    Riepe, G; Whiteley, M S; Wente, A; Rogge, A; Schröder, A; Galland, R B; Imig, H

    1999-11-01

    polyester grafts are expensive, single-use items. Some manufacturers of uncoated, woven grafts include instructions for autoclave resterilisation to be performed at the surgeon's own request. Others warn against such manipulation. Theoretically, the glass transition point of polyester at 70-80 degrees C and the possible acceleration of hydrolysis suggest that autoclave resterilisation at 135 degrees C might be a problem. a DeBakey Soft Woven Dacron Vascular Prosthesis (Bard) and a Woven Double Velour Dacron Graft (Meadox) were autoclave-resterilised 0 to 20 times, having been weighed before and after sterilisation. Tactile testing was performed. Mechanical properties were examined by probe puncture and single-filament testing, the surface was examined by scanning electron microscopy and the degree of hydrolysis by infra-red spectroscopy. tactile testing revealed a change of feeling with increasing cycles of resterilisation. Investigation of weight, textile strength, single-filament strength, electron microscopy of the surface and infra-red spectroscopy showed no change of the material. changes felt are presumably a surface phenomenon, not measurably affecting strength or chemistry of material after autoclave resterilisation. We therefore feel that it is safe to use once-autoclave-resterilised surplus uncoated polyester grafts, provided that sterility is guaranteed. Copyright 1999 Harcourt Publishers Ltd.

  7. A Review on Epoxy and Polyester Based Polymer Concrete and Exploration of Polyfurfuryl Alcohol as Polymer Concrete

    Directory of Open Access Journals (Sweden)

    Rakesh Kumar

    2016-01-01

    Full Text Available Petroleum based epoxy and polyester based thermoset resins can be used to produce high-quality polymer concrete. However, petroleum based resources are finite and this has necessitated the development of thermoset bioresins to be used as polymer concrete. Furfuryl alcohol (FA, a thermoset bioresin, is derived from lignocellulosic biomass and it can be polymerized into polyfurfuryl alcohol (PFA in the presence of an acid catalyst. The highly exothermic polymerization reactions involving conversion of FA to PFA can be used to fabricate PFA based concrete with rock-like structure. The PFA based polymer concrete offers the broadest range of chemical resistance against acid and alkali over all other types of polymer concrete which are based upon different thermoset polymeric systems. In this review paper, we have discussed the formulations (incorporation of aggregates, fillers, and resin and properties (especially compressive and flexural of epoxy and polyester based polymer concrete. In another section, we have given the mechanical, thermal, and water resistance properties of PFA based biopolymer, biocomposites, nanocomposites, and polymer concrete. Lastly, we have tried to explore whether PFA can be used successfully as biopolymer concrete or not.

  8. Fabrication Facilities

    Data.gov (United States)

    Federal Laboratory Consortium — The Fabrication Facilities are a direct result of years of testing support. Through years of experience, the three fabrication facilities (Fort Hood, Fort Lewis, and...

  9. Engineered emissivity of textile fabrics by the inclusion of ceramic particles.

    Science.gov (United States)

    Pooley, Matthew A; Anderson, David M; Beckham, Haskell W; Brennan, James F

    2016-05-16

    Composite textile materials, created from a blend of different fibers, have long been used to engineer the properties and performance of fabrics to combine comfort with functionality, such as to create materials with differing optical properties. Some changes to the optical properties of materials in the infrared are subtle and difficult to measure. We present a measurement technique, experimental apparatus, and associated data analysis procedure for detecting small changes in the emissivity of fabrics in the mid-infrared wavelength range (7.5-14 µm). Using this technique, we demonstrate that the emissivity of polyester fabric can be engineered controllably via the inclusion of ceramic microparticles within the fabric fibers.

  10. Comb-shaped polyesters of aliphatic dicarboxylic acids and 2-octadecyl-1,3-propanediol: 1. Synthesis and microstructure

    DEFF Research Database (Denmark)

    Andruzzi, F.; Hvilsted, S.

    1991-01-01

    Comb-shaped polyesters are prepared by polytransesterification of 2-octadecyl-1,3-propanediol and diphenyl suberate, sebacate, dodecanedioate, tetradecanedioate and hexadecanedioate in turn. The developed melt polycondensation procedure generally results in polyesters with intrinsic viscosities i...

  11. Environmentally benign synthesis of saturated and unsaturated aliphatic polyesters via enzymatic polymerization of biobased monomers derived from renewable resources

    NARCIS (Netherlands)

    Jiang, Yi; Woortman, Albert J. J.; van Ekenstein, Gert O. R. Alberda; Loos, Katja

    2015-01-01

    Aliphatic polyesters are of great interest due to their broad potential applications and sustainability. Itaconate-based aliphatic polyesters are even more appealing in biomedical and pharmaceutical fields, as they are renewable functional polymers that can be biodegradable, biocompatible, and

  12. Evaluation of Efficacy of Melamine Treatment on Cotton Fabrics

    Directory of Open Access Journals (Sweden)

    N. D. Bhandari

    1968-05-01

    Full Text Available Melamine resin treated cotton fabric was exposed to outdoor weathering for 12 months at Kanpur to study its efficacy against weathering. Along with this, fabric treated with (i hydrated oxides of copper+manganese(ii nickel naphthenate and (iii urea formaldehyde resin, were also exposed to find out the most efficacious treatment of these. Pre monsoon exposure of the three sets commenced from 29th of April, May and June ' 65 respectively. Breaking strength and tear strength data for 12 months exposure have revealed that treatment with hydrated oxides of copper + manganese affords maximum protection to cotton fabrics against weathering degradation irrespective of the month of exposure. Urea formaldehyde resin and nickel naphthenate treatment are the next best. Melamine treatment is equally good as hydrated oxides of copper+manganese if the results are based on breaking strength alone but considering loss in tear strength it gave a poor performance. All the treatment have been found to afford protection against irradiation from mercury arc lamp (rich in ultra violet light. Melamine and urea formaldehyde resin treatments were found completely resistant to microbiological attack in soil burial.

  13. 78 FR 2366 - Certain Polyester Staple Fiber From the People's Republic of China: Final Results of Antidumping...

    Science.gov (United States)

    2013-01-11

    ... International Trade Administration Certain Polyester Staple Fiber From the People's Republic of China: Final... of the antidumping duty order on certain polyester staple fiber (``PSF'') from the People's Republic... Polyester Staple Fiber From the People's Republic of China: Preliminary Results of the Antidumping...

  14. 76 FR 28420 - Certain Polyester Staple Fiber From the People's Republic of China: Full Extension of Preliminary...

    Science.gov (United States)

    2011-05-17

    ... International Trade Administration Certain Polyester Staple Fiber From the People's Republic of China: Full... polyester staple fiber from the People's Republic of China (``PRC''). This review covers the period June 1... duty order on certain polyester staple fiber from the PRC. See Initiation of Antidumping...

  15. 77 FR 54898 - Certain Polyester Staple Fiber From the People's Republic of China: Final Results of Expedited...

    Science.gov (United States)

    2012-09-06

    ... International Trade Administration Certain Polyester Staple Fiber From the People's Republic of China: Final... certain polyester staple fiber from the People's Republic of China (``PRC'') pursuant to section 751(c) of... duty order on certain polyester staple fiber from the PRC would be likely to lead to continuation...

  16. 78 FR 38939 - Certain Polyester Staple Fiber From the People's Republic of China: Final Results of Antidumping...

    Science.gov (United States)

    2013-06-28

    ... International Trade Administration Certain Polyester Staple Fiber From the People's Republic of China: Final... antidumping duty order on certain polyester staple fiber (``PSF'') from the People's Republic of China (``PRC... below. \\1\\ See Certain Polyester Staple Fiber From the People's Republic of China: Preliminary...

  17. 75 FR 5763 - Notice of Correction to the First Administrative Review of Certain Polyester Staple Fiber From...

    Science.gov (United States)

    2010-02-04

    ... International Trade Administration Notice of Correction to the First Administrative Review of Certain Polyester... antidumping duty order on certain polyester staple fiber from the People's Republic of China (``PRC''). See First Administrative Review of Certain Polyester Staple Fiber From the People's Republic of China:...

  18. 75 FR 34097 - Certain Polyester Staple Fiber From Taiwan: Extension of the Final Results of Antidumping Duty...

    Science.gov (United States)

    2010-06-16

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF COMMERCE International Trade Administration Certain Polyester Staple Fiber From Taiwan: Extension of the Final Results of... certain polyester staple fiber from Taiwan. See Certain Polyester Staple Fiber from Taiwan:...

  19. 76 FR 38612 - Certain Polyester Staple Fiber From the Republic of Korea and Taiwan: Final Results of the...

    Science.gov (United States)

    2011-07-01

    ... International Trade Administration Certain Polyester Staple Fiber From the Republic of Korea and Taiwan: Final... Commerce (the Department) initiated the second sunset reviews of the antidumping duty orders on polyester... otherwise processed for spinning, of polyesters measuring 3.3 decitex (3 denier, inclusive) or more...

  20. 76 FR 60802 - Certain Polyester Staple Fiber From the Republic of Korea and Taiwan: Continuation of Antidumping...

    Science.gov (United States)

    2011-09-30

    ... International Trade Administration Certain Polyester Staple Fiber From the Republic of Korea and Taiwan... certain polyester staple fiber from the Republic of Korea (Korea) and Taiwan would likely lead to a... orders on polyester staple fiber from Korea and Taiwan \\1\\ pursuant to section 751(c) of the Tariff...

  1. 75 FR 76954 - Certain Polyester Staple Fiber From the People's Republic of China: Extension of Time Limit for...

    Science.gov (United States)

    2010-12-10

    ... International Trade Administration Certain Polyester Staple Fiber From the People's Republic of China: Extension... Register the Preliminary Results of the second administrative review of certain polyester staple fiber.... See Certain Polyester Staple Fiber From the People's Republic of China: Notice of Preliminary...

  2. 76 FR 37830 - Polyester Staple Fiber From Korea and Taiwan; Scheduling of Expedited Five-Year Reviews...

    Science.gov (United States)

    2011-06-28

    ... COMMISSION Polyester Staple Fiber From Korea and Taiwan; Scheduling of Expedited Five-Year Reviews Concerning the Antidumping Duty Orders on Polyester Staple Fiber From Korea and Taiwan AGENCY: United States...) to determine whether revocation of the antidumping duty orders on polyester staple fiber from...

  3. 77 FR 21733 - Certain Polyester Staple Fiber From Taiwan: Extension of Time Limit for Preliminary Results of...

    Science.gov (United States)

    2012-04-11

    ... International Trade Administration Certain Polyester Staple Fiber From Taiwan: Extension of Time Limit for... antidumping duty order on certain polyester staple fiber from Taiwan for the period May 1, 2010, through April 30, 2011.\\1\\ In Certain Polyester Staple Fiber From Taiwan: Extension of Time Limit for...

  4. 75 FR 64252 - Certain Polyester Staple Fiber From the Republic of Korea: Final Results of the 2008-2009...

    Science.gov (United States)

    2010-10-19

    ... International Trade Administration Certain Polyester Staple Fiber From the Republic of Korea: Final Results of... certain polyester staple fiber from the Republic of Korea and invited interested parties to comment. The... 15, 2010, the Department of Commerce (``the Department'') published Certain Polyester Staple...

  5. 76 FR 2886 - Certain Polyester Staple Fiber From the People's Republic of China: Final Results and Partial...

    Science.gov (United States)

    2011-01-18

    ... International Trade Administration Certain Polyester Staple Fiber From the People's Republic of China: Final... second administrative review of the antidumping duty order on certain polyester staple fiber (``PSF'') from the People's Republic of China (``PRC''). See Certain Polyester Staple Fiber From the...

  6. 77 FR 50530 - Polyester Staple Fiber From China; Scheduling of an Expedited Five-Year Review Concerning the...

    Science.gov (United States)

    2012-08-21

    ... COMMISSION Polyester Staple Fiber From China; Scheduling of an Expedited Five-Year Review Concerning the Antidumping Duty Order on Polyester Staple Fiber From China AGENCY: United States International Trade... determine ] whether revocation of the antidumping duty order on polyester staple fiber from China would...

  7. 77 FR 71579 - Polyester Staple Fiber From Taiwan: Notice of Court Decision Not in Harmony With Final Results of...

    Science.gov (United States)

    2012-12-03

    ... International Trade Administration Polyester Staple Fiber From Taiwan: Notice of Court Decision Not in Harmony... order on polyester staple fiber from Taiwan covering the period of review (``POR'') May 1, 2009, through... Certain Polyester Staple Fiber From Taiwan: Final Results of Antidumping Duty Administrative Review, 76...

  8. 75 FR 38463 - Greige Polyester Cotton Printcloth From the People's Republic of China: Final Results of Sunset...

    Science.gov (United States)

    2010-07-02

    ... International Trade Administration Greige Polyester Cotton Printcloth From the People's Republic of China: Final... Order; Greige Polyester Cotton Printcloth from the People's Republic of China, 70 FR 36927 (June 27... Antidumping Duty Order; Greige Polyester Cotton Printcloth from the People's Republic of China, 70 FR...

  9. 76 FR 52935 - Certain Polyester Staple Fiber From Korea: Rescission of Antidumping Duty Administrative Review

    Science.gov (United States)

    2011-08-24

    ... International Trade Administration Certain Polyester Staple Fiber From Korea: Rescission of Antidumping Duty... to request an administrative review of the antidumping order on polyester staple fiber from Korea... Reviews and Request for Revocation in Part, 76 FR 37781 (June 28, 2011). Scope of the Order...

  10. Incorporation of different crystallizable amide blocks in segmented poly(ester amide)s

    NARCIS (Netherlands)

    Lips, P.A.M.; Broos, R.; Heeringen, van M.J.M.; Dijkstra, P.J.; Feijen, J.

    2005-01-01

    High molecular weight segmented poly(ester amide)s were prepared by melt polycondensation of dimethyl adipate, 1,4-butanediol and a symmetrical bisamide-diol based on ε-caprolactone and 1,2-diaminoethane or 1,4-diaminobutane. FT-IR and WAXD analysis revealed that segmented poly(ester amide)s based

  11. Prevention of primary vascular graft infection with silver-coated polyester graft in a porcine model

    DEFF Research Database (Denmark)

    Gao, H; Sandermann, J; Prag, J;

    2010-01-01

    To evaluate the efficacy of a silver-coated vascular polyester graft in the prevention of graft infection after inoculation with Staphylococcus aureus in a porcine model.......To evaluate the efficacy of a silver-coated vascular polyester graft in the prevention of graft infection after inoculation with Staphylococcus aureus in a porcine model....

  12. Light-induced circular birefringence in cyanoazobenzene side-chain liquid-crystalline polyester films

    DEFF Research Database (Denmark)

    Naydenova, I; Nikolova, L; Ramanujam, P.S.;

    1999-01-01

    We report the inducement of large circular birefringence (optical activity) in films of a cyanoazobenzene side-chain liquid-crystalline polyester on illumination with circularly polarized light. The polyester has no chiral groups and is initially isotropic. The induced optical rotation is up to 5...

  13. Life-cycle assessment of textiles manufacture of polyester shirt (VB)

    DEFF Research Database (Denmark)

    Othman, Samer; Peter, Oduro Justice; Hassan, Osama;

    1998-01-01

    According to the EDIP (Environmental Design of Industrial Products), It is made possible to perform resource and environmental profile analysis of the 100% polyester shirt. In order to understand the true life-cycle consequences, life-cycle analysis of a typical 100% polyester shirt was carried out...

  14. Techno-economic analysis of unsaturated polyester production from waste PET

    OpenAIRE

    Drah, Abdusalam; Rusmirović, Jelena D.; Milošević, Milena; Kalifa, Mustafa; Stojiljković, Ivana; Rančić, Milica; Aleksandar D. Marinković

    2016-01-01

    Unsaturated polyester resins (UPe) were synthesized from maleic anhydride and products of glycolysis, obtained by polyethylene terephthalate (PET) depolymerization with dipropylene glycol (DPG) in the presence of tetrabutyl titanate catalyst. Waste PET glycolyzed product and UPes were characterized by FTIR and NMR spectroscopy, elemental analysis, acid value (AV), hydroxyl value (HV) and iodine value. Nanocomposites, based on unsaturated polyester resins and hexamethyldisilazane modified sili...

  15. Azobenzene side-chain liquid crystalline polyesters with outstanding optical storage properties

    DEFF Research Database (Denmark)

    Hvilsted, Søren; Pedersen, M; Holme, NCR

    1998-01-01

    on azobenzene, iii- the methylene main-chain segment length, and iv-the polyester molecular mass, all influence the optical storage properties. A general synthetic route to novel mesogenic azobenzene diols comprising parameters i and ii is outlined. Polyesters with molecular masses (parameter iv) up to 100...

  16. The persistence of human scalp hair on clothing fabrics.

    Science.gov (United States)

    Dachs, J; McNaught, I J; Robertson, J

    2003-12-17

    This study reports the persistence behaviour of human scalp hairs under a number of different circumstances. The effects of artificial dyeing of hairs, the presence or absence of roots and different types of fabrics on the persistence of hair on a variety of garments were investigated. The garments were made from cotton, polycotton, cotton/acrylic, polyester and wool. The results indicated that neither artificial dyes nor the presence or absence of roots had statistically significant effects on the persistence of hair. In contrast, the type of fabric had a major impact and it was found that, generally, hairs persist longer on rougher fabrics. The rate of loss of hairs from non-woollen fabrics during normal wear was found to follow an exponential decay curve. In contrast, the rate of loss from the woollen garments was quite linear, indicating a constant, even loss, and thus suggests that a different process is involved in the persistence of hairs on woollen garments from that on non-woollen garments. The speed at which hair was lost from fabrics decreased in the order polyester, cotton/acrylic, polycotton, cotton, smooth wool, rough wool, so that wool gives the best chance of recovering samples of hair. Due to the uniqueness of each case, it is advised that caution be used when making any interpretations and before drawing any conclusions.

  17. Analysis of Mechanical Properties of Fabrics of Different Raw Material

    Directory of Open Access Journals (Sweden)

    Aušra ADOMAITIENĖ

    2011-07-01

    Full Text Available The study analyzes dependence of mechanical properties (breaking force, elongation at break, static friction force and static friction coefficient on integrated fabric structure factor j and raw material density r, among the fabrics of different raw material (cotton, wool, polypropylene, polyester and polyacrylnitrile and woven in different conditions. The received results demonstrate that sometimes strong dependences exist (wool, polypropylene and polyacrylnitrile, whereas in some cases (cotton and polyester there is no correlation. It was also discovered that the breaking force and elongation at break in the direction of weft increase, when fabric structure becomes more rigid. In the meantime variations of the curves in the direction of warp are insignificant. Regarding static friction force and static friction coefficient (found in two cases, when fabrics were rubbing against leather and materials, it was discovered that consistency of the curves is irregular, i. e. they either increase or decrease, when integrated fabric structure factor j growth. It was also identified that some dependences are not strong and relationship between explored and analyzed factors does not exist. Variation of all these mechanical properties with respect to material density r enables to conclude that increase of material density r results in poor dependences or they are whatsoever non-existent.http://dx.doi.org/10.5755/j01.ms.17.2.487

  18. Effect of Copper/Graphite Addition on Electrical Conductivity and Thermal Insulation of Unsaturated Polyester/Jute Composites

    Science.gov (United States)

    Biswas, Bhabatosh; Chabri, Sumit; Mitra, Bhairab Chandra; Das, Kunal; Bandyopadhyay, Nil Ratan; Sinha, Arijit

    2017-04-01

    Jute fibre along with Cu particle reinforced unsaturated polyester composites having different filler loading viz. 2, 5, 10 and 15 wt% were fabricated by compression molding technique. In present investigation, it was observed that with fillers (Jute and Cu) incorporation, the electrical conductivity was monotonically increased up to 10 wt% of filler content followed by saturation at 15 wt% of filler content. It was further observed that along with fillers (Jute and Cu) incorporation, the thermal insulation was decreased monotonically up to 10 wt% of filler content and achieved a saturation at 15 wt% of filler content. A similar trend was observed with the variation of electrical conductivity and thermal insulation after incorporation of graphite within copper reinforced UP/Jute composites. Structural investigation through SEM, XRD and FTIR confirm the dispersion of fillers. An improvement of crystallinity of the matrix with fillers addition was observed from XRD analyses. The interfacial bonding between fillers and matrix was studied from FTIR pattern.

  19. Synthesis, characterization and applications of some novel mordent and heterocyclic disperse dyes on polyester and wool fibers

    Directory of Open Access Journals (Sweden)

    Hitendra Mangubhai Patel

    2012-10-01

    Full Text Available The novel mordent and disperse heterocyclic dyes were prepared by coupling of various diazo solution of aromatic amines with 1-[(2-butyl-2,3-dihydrobenzofuran-3-yl]-1-(4-hydroxyphenylmethanone. The resultant mordent and disperse heterocyclic dyes were characterized by elemental analyses, IR and 1H-NMR and 13C-NMR spectral studies. The UV-visible spectral data have also been discussed in terms of structural property relationship. The dyeing assessment of all the mordent and disperse heterocyclic dyes was evaluated on wool and polyester textile fibers. The results of antibacterial studies of chrome pretreated fabrics revealed that the toxicity of mordented dyes against Escherichia coli, Staphylococcus aureus, Salmonella typhi, Bacillus subtilis bacteria was fairly good.

  20. Synthesis of unsaturated polyesters for improved interfacial strength in carbon fibre composites

    DEFF Research Database (Denmark)

    Gamstedt, E.K.; Skrifvars, M.; Jacobsen, T. K.

    2002-01-01

    Carbon fibres are gaining use as reinforcement in glass fibre/polyester composites for increased stiffness as a hybrid composite. The mechanics and chemistry of the carbon fibre–polyester interface should be addressed to achieve an improvement also in fatigue performance and off-axis strength....... To make better use of the versatility of unsaturated polyesters in a carbon fibre composite, a set of unsaturated polyester resins have been synthesized with different ratios of maleic anhydride, o-phthalic anhydride and 1,2-propylene glycol as precursors. The effective interfacial strength was determined...... by micro-Raman spectroscopy of a single-fibre composite tested in tension. The interfacial shear strength with untreated carbon fibres increased with increasing degree of unsaturation of the polyester, which is controlled by the relative amount of maleic anhydride. This can be explained by a contribution...

  1. Flame Retardance and Physical Properties of Novel Cured Blends of Unsaturated Polyester and Furan Resins

    Directory of Open Access Journals (Sweden)

    Baljinder Kaur Kandola

    2015-02-01

    Full Text Available Novel blends of two furan resins with an unsaturated polyester have been prepared and cured by parallel free radical (for the unsaturated polyester and acid-catalysed crosslinking (for the furan resin to give co-cured composite materials. Although these materials have inferior physical properties, such as low Tg and low storage modulus compared with those of unsaturated polyester and furan resins alone, they show markedly improved flame retardance compared with that of the normally highly flammable unsaturated polyester. This increased flame retardance arises from a condensed phase mechanism in which the furanic component forms a semi-protective char, reducing rates of thermal degradation and total heat release and heat of combustion. The blends also burn with reduced smoke output compared with that from unsaturated polyester alone.

  2. Biodegradation of polyester polyurethane during commercial composting and analysis of associated fungal communities.

    Science.gov (United States)

    Zafar, Urooj; Nzeram, Petrus; Langarica-Fuentes, Adrian; Houlden, Ashley; Heyworth, Alan; Saiani, Alberto; Robson, Geoff D

    2014-04-01

    In this study the biodegradation of polyurethane (PU) during the maturation stage of a commercial composting process was investigated. PU coupons were buried in the centre and at the surface of a 10 m high compost pile. Fungal communities colonising polyester PU coupons were compared with the native compost communities using culture based and molecular techniques. Putative polyester PU degrading fungi were ubiquitous in compost and rapidly colonised the surface of polyester PU coupons with significant deterioration. As the temperature decreased, fungal diversity in the compost and on the surface of the polyester PU coupons increased and selection of fungal community on the polyester PU coupons occurs that is different from the surrounding compost. Copyright © 2014 Elsevier Ltd. All rights reserved.

  3. Enzymatic saccharification coupling with polyester recovery from cotton-based waste textiles by phosphoric acid pretreatment.

    Science.gov (United States)

    Shen, Fei; Xiao, Wenxiong; Lin, Lili; Yang, Gang; Zhang, Yanzong; Deng, Shihuai

    2013-02-01

    In order to recycle the cotton-based waste textiles, a novel process was designed for pretreating waste textiles with phosphoric acid to recover polyester and fermentable sugar. The effects of pretreatment conditions including, phosphoric acid concentration, pretreatment temperature, time, and ratio of textiles and phosphoric acid were thoroughly investigated. Results indicated the mentioned four factors had significant influences on sugar and polyester recovery. Almost complete polyester recovery was achieved by enhancing phosphoric acid concentration, temperature and pretreatment time or reducing the ratio of textiles and phosphoric acid. However, these behaviors decreased the sugar recovery seriously. 100% polyester recovery with a maximum sugar recovery of 79.2% was achieved at the optimized conditions (85% phosphoric acid, 50°C, 7h, and the ratio of 1:15). According to the technical and cost-benefit analysis, it was technically feasible and potentially profitable to recover polyester and sugar from waste textiles by phosphoric acid pretreatment.

  4. Effects of Fiber Denier, Fiber Cross-Sectional Shape and Fabric Density on Acoustical Behavior of Vertically Lapped Nonwoven Fabrics

    Directory of Open Access Journals (Sweden)

    Mevlut Tascan, Ph.D.

    2008-06-01

    Full Text Available Acoustical insulation and absorption properties of nonwoven fabrics depend on fiber geometry and fiber arrangement within the fabric structure. The different structures of the fibers result in different total surface areas of nonwoven fabrics. Nonwoven fabrics such as vertically lapped fabrics are ideal materials for use as acoustical insulation products, because they have high total surface. Vertically lapped nonwoven technology consists of carding, perpendicular layering of the carded webs, and through-air bonding using synthetic binder fibers. The surface area of the fabric is directly related to the denier and cross-sectional shape of the fibers in the fabric. Smaller deniers yield more fibers per unit weight of the material, higher total fiber surface area, and greater possibilities for a sound wave to interact with the fibers in the fabric structure.The research in the literature uses two methods for measuring acoustical properties of fabric materials: the impedance tube and reverberation room method. Small test samples are in the impedance tube method and sound absorption coefficient is determined at each frequency. Large reverberation rooms and large test samples are used for the reverberation room method. A direct comparative acoustical properties measurement device that was designed and fabricated at Clemson University School of Materials Science & Engineering was used to measure acoustical insulation in this research. This paper provides a description of the measurement devices and acoustical measurement data for vertically lapped nonwoven fabrics made from three different polyester fiber shape and two denier levels.

  5. Starch/polyester films: simultaneous optimisation of the properties for the production of biodegradable plastic bags

    Directory of Open Access Journals (Sweden)

    J. B. Olivato

    2013-01-01

    Full Text Available Blends of starch/polyester have been of great interest in the development of biodegradable packaging. A method based on multiple responses optimisation (Desirability was used to evaluate the properties of tensile strength, perforation force, elongation and seal strength of cassava starch/poly(butylene adipate-co-terephthalate (PBAT blown films produced via a one-step reactive extrusion using tartaric acid (TA as a compatibiliser. Maximum results for all the properties were set as more desirable, with an optimal formulation being obtained which contained (55:45 starch/PBAT (88.2 wt. (%, glycerol (11.0 wt. (% and TA (0.8 wt. (%. Biodegradable plastic bags were produced using the film with this formulation, and analysed according to the standard method of the Associação Brasileira de Normas Técnicas (ABNT. The bags exhibited a 45% failure rate in free-falling dart impact tests, a 10% of failure rate in dynamic load tests and no failure in static load tests. These results meet the specifications set by the standard. Thus, the biodegradable plastic bags fabricated with an optimised formulation could be useful as an alternative to those made from non-biodegradable materials if the nominal capacity declared for this material is considered.

  6. Development of Photocrosslinkable Urethane-Doped Polyester Elastomers for Soft Tissue Engineering.

    Science.gov (United States)

    Zhang, Yi; Tran, Richard T; Gyawali, Dipendra; Yang, Jian

    2011-01-01

    Finding an ideal biomaterial with the proper mechanical properties and biocompatibility has been of intense focus in the field of soft tissue engineering. This paper reports on the synthesis and characterization of a novel crosslinked urethane-doped polyester elastomer (CUPOMC), which was synthesized by reacting a previously developed photocrosslinkable poly (octamethylene maleate citrate) (POMC) prepolymers (pre-POMC) with 1,6-hexamethylene diisocyanate (HDI) followed by thermo- or photo-crosslinking polymerization. The mechanical properties of the CUPOMCs can be tuned by controlling the molar ratios of pre-POMC monomers, and the ratio between the prepolymer and HDI. CUPOMCs can be crosslinked into a 3D network through polycondensation or free radical polymerization reactions. The tensile strength and elongation at break of CUPOMC synthesized under the known conditions range from 0.73±0.12MPa to 10.91±0.64MPa and from 72.91±9.09% to 300.41±21.99% respectively. Preliminary biocompatibility tests demonstrated that CUPOMCs support cell adhesion and proliferation. Unlike the pre-polymers of other crosslinked elastomers, CUPOMC pre-polymers possess great processability demonstrated by scaffold fabrication via a thermally induced phase separation method. The dual crosslinking methods for CUPOMC pre-polymers should enhance the versatile processability of the CUPOMC used in various conditions. Development of CUPOMC should expand the choices of available biodegradable elastomers for various biomedical applications such as soft tissue engineering.

  7. Improvement of interaction between pre-dispersed multi-walled carbon nanotubes and unsaturated polyester resin

    Energy Technology Data Exchange (ETDEWEB)

    Beg, M. D. H., E-mail: dhbeg@yahoo.com; Moshiul Alam, A. K. M., E-mail: akmmalam@gmail.com; Yunus, R. M. [Universiti Malaysia Pahang, Faculty of Chemical and Natural Resources Engineering (Malaysia); Mina, M. F. [Bangladesh University of Engineering and Technology, Department of Physics (Bangladesh)

    2015-01-15

    Efforts are being given to the development of well-dispersed nanoparticle-reinforced polymer nanocomposites in order to tailor the material properties. In this perspective, well dispersion of multi-walled carbon nanotubes (MWCNTs) in unsaturated polyester resin (UPR) was prepared using pre-dispersed MWCNTs in tetrahydrofuran solvent with ultrasonication method. Then the well-dispersed MWCNTs reinforced UPR nanocomposites were fabricated through solvent evaporation. Fourier-transform infrared spectroscopy indicates a good interaction between matrix and MWCNTs. This along with homogeneous dispersion of nanotubes in matrix has been confirmed by the field emission scanning electron microscopy. At low shear rate, the value of viscosity of UPR is 8,593 mPa s and that of pre-dispersed MWCNT–UPR suspension is 43,491 mPa s, showing implicitly a good dispersion of nanotubes. A notable improvement in the crystallinity of UPR from 14 to 21 % after MWCNTs inclusion was observed by X-ray diffractometry. The mechanical properties, such as tensile strength, tensile modulus, impact strength, and elongation-at-break, of nanocomposite were found to be increased to 22, 20, 28, and 87 %, respectively. The estimated melting enthalpy per gram for composites as analyzed by differential scanning calorimetry is higher than that of UPR. The onset temperature of thermal decomposition in the nanocomposites as monitored by thermogravimetric analysis is found higher than that of UPR. Correlations among MWCNTs dispersion, nucleation, fracture morphology, and various properties were measured and reported.

  8. Development of novel electrically conductive scaffold based on hyperbranched polyester and polythiophene for tissue engineering applications.

    Science.gov (United States)

    Jaymand, Mehdi; Sarvari, Raana; Abbaszadeh, Parisa; Massoumi, Bakhshali; Eskandani, Morteza; Beygi-Khosrowshahi, Younes

    2016-11-01

    A novel electrically conductive scaffold containing hyperbranched aliphatic polyester (HAP), polythiophene (PTh), and poly(ε-caprolactone) (PCL) for regenerative medicine application was succesfully fabricated via electrospinning technique. For this purpose, the HAP (G4; fourth generation) was synthesized via melt polycondensation reaction from tris(methylol)propane and 2,2-bis(methylol)propionic acid (bis-MPA). Afterward, the synthesized HAP was functionalized with 2-thiopheneacetic acid in the presence of N,N-dicyclohexyl carbodiimide, and N-hydroxysuccinimide as coupling agent and catalyst, respectively, to afford a thiophene-functionalized G4 macromonomer. This macromonomer was subsequently used in chemical oxidation copolymerization with thiophene monomer to produce a star-shaped PTh with G4 core (G4-PTh). The solution of the G4-PTh, and PCL was electrospun to produce uniform, conductive, and biocompatible nanofibers. The conductivity, hydrophilicity, and mechanical properties of these nanofibers were investigated. The biocompatibility of the electrospun nanofibers were evaluated by assessing the adhesion and proliferation of mouse osteoblast MC3T3-E1 cell line and in vitro degradability to demonstrate their potential uses as a tissue engineering scaffold. © 2016 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 104A: 2673-2684, 2016.

  9. Sound Absorption Properties Of Single-Hole Hollow Polyester Fiber Reinforced Hydrogenated Carboxyl Nitrile Rubber Composites

    Directory of Open Access Journals (Sweden)

    Jie Hong

    2017-09-01

    Full Text Available A series of single-hole hollow polyester fiber (SHHPF reinforced hydrogenated carboxyl nitrile rubber (HXNBR composites were fabricated. In this study, the sound absorption property of the HXNBR/SHHPF composite was tested in an impedance tube, the composite morphology was characterized by scanning electron microscope (SEM, and the tensile mechanical property was measured by strength tester. The results demonstrated that a remarkable change in sound absorption can be observed by increasing the SHHPF content from 0% to 40%. In the composite with 40% SHHPF in 1 mm thickness, the sound absorption coefficient reached 0.671 at 2,500 Hz; the effective bandwidth was 1,800-2,500 Hz for sound absorption coefficient larger than 0.2. But the sound absorption property of the composite deteriorated when the SHHPF content increased to 50% in 1 mm thickness. While with 20% SHHPF proportion, the sound absorption property was improved by increasing the thickness of composites from 1 to 5 mm. Compared with the pure HXNBR of the same thickness, the tensile mechanical property of the composite improved significantly by increasing the SHHPF proportion. As a lightweight composite with excellent sound absorption property, the HXNBR/SHHPF composite has potential practical application value in the fields of engineering.

  10. Engineered Hypopharynx from Coculture of Epithelial Cells and Fibroblasts Using Poly(ester urethane as Substratum

    Directory of Open Access Journals (Sweden)

    Zhisen Shen

    2013-01-01

    Full Text Available Porous polymeric scaffolds have been much investigated and applied in the field of tissue engineering research. Poly(ester urethane (PEU scaffolds, comprising pores of 1–20 μm in diameter on one surface and ≥200 μm on the opposite surface and in bulk, were fabricated using phase separation method for hypopharyngeal tissue engineering. The scaffolds were grafted with silk fibroin (SF generated from natural silkworm cocoon to enhance the scaffold’s hydrophilicity and further improve cytocompatibility to both primary epithelial cells (ECs and fibroblasts of human hypopharynx tissue. Coculture of ECs and fibroblasts was conducted on the SF-grafted PEU scaffold (PEU-SF to evaluate its in vitro cytocompatibility. After co-culture for 14 days, ECs were lined on the scaffold surface while fibroblasts were distributed in scaffold bulk. The results of in vivo investigation showed that PEU porous scaffold possessed good biocompatibility after it was grafted by silk fibroin. SF grafting improved the cell/tissue infiltration into scaffold bulk. Thus, PEU-SF porous scaffold is expected to be a good candidate to support the hypopharynx regeneration.

  11. Polyester type polyHIPE scaffolds with an interconnected porous structure for cartilage regeneration

    Science.gov (United States)

    Naranda, Jakob; Sušec, Maja; Maver, Uroš; Gradišnik, Lidija; Gorenjak, Mario; Vukasović, Andreja; Ivković, Alan; Rupnik, Marjan Slak; Vogrin, Matjaž; Krajnc, Peter

    2016-06-01

    Development of artificial materials for the facilitation of cartilage regeneration remains an important challenge in orthopedic practice. Our study investigates the potential for neocartilage formation within a synthetic polyester scaffold based on the polymerization of high internal phase emulsions. The fabrication of polyHIPE polymer (PHP) was specifically tailored to produce a highly porous (85%) structure with the primary pore size in the range of 50–170 μm for cartilage tissue engineering. The resulting PHP scaffold was proven biocompatible with human articular chondrocytes and viable cells were observed within the materials as evaluated using the Live/Dead assay and histological analysis. Chondrocytes with round nuclei were organized into multicellular layers on the PHP surface and were observed to grow approximately 300 μm into the scaffold interior. The accumulation of collagen type 2 was detected using immunohistochemistry and chondrogenic specific genes were expressed with favorable collagen type 2 to 1 ratio. In addition, PHP samples are biodegradable and their baseline mechanical properties are similar to those of native cartilage, which enhance chondrocyte cell growth and proliferation.

  12. Highly porous and mechanically robust polyester poly(ethylene glycol) sponges as implantable scaffolds.

    Science.gov (United States)

    Ozcelik, Berkay; Blencowe, Anton; Palmer, Jason; Ladewig, Katharina; Stevens, Geoffrey W; Abberton, Keren M; Morrison, Wayne A; Qiao, Greg G

    2014-06-01

    The development of suitable scaffolds plays a significant role in tissue engineering research. Although scaffolds with promising features have been produced via a variety of innovative methods, there are no fully synthetic tissue engineering scaffolds that possess all the desired properties in one three-dimensional construct. Herein, we report the development of novel polyester poly(ethylene glycol) (PEG) sponges that display many of the desirable scaffold characteristics. Our novel synthetic approach utilizes acidchloride/alcohol chemistry, whereby the reaction between a hydroxyl end-functionalized 4-arm PEG and sebacoyl chloride resulted in cross-linking and simultaneous hydrogen chloride gas production, which was exploited for the in situ formation of highly interconnected pores. Variation of the fabrication conditions, including the precursor volume and concentration, allowed the pore size and structure as well as the compressive properties to be tailored. The sponges were found to possess excellent elastic properties, preserving their shape even after 80% compressive strain without failure. The benign properties of the sponges were demonstrated in an in vivo subcutaneous rat model, which also revealed uniform infiltration of vascularized tissue by 8 weeks and complete degradation of the sponges by 16 weeks, with only a minimal inflammatory response being observed over the course of the experiments. Copyright © 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

  13. Improvement of interaction between pre-dispersed multi-walled carbon nanotubes and unsaturated polyester resin

    Science.gov (United States)

    Beg, M. D. H.; Moshiul Alam, A. K. M.; Yunus, R. M.; Mina, M. F.

    2015-01-01

    Efforts are being given to the development of well-dispersed nanoparticle-reinforced polymer nanocomposites in order to tailor the material properties. In this perspective, well dispersion of multi-walled carbon nanotubes (MWCNTs) in unsaturated polyester resin (UPR) was prepared using pre-dispersed MWCNTs in tetrahydrofuran solvent with ultrasonication method. Then the well-dispersed MWCNTs reinforced UPR nanocomposites were fabricated through solvent evaporation. Fourier-transform infrared spectroscopy indicates a good interaction between matrix and MWCNTs. This along with homogeneous dispersion of nanotubes in matrix has been confirmed by the field emission scanning electron microscopy. At low shear rate, the value of viscosity of UPR is 8,593 mPa s and that of pre-dispersed MWCNT-UPR suspension is 43,491 mPa s, showing implicitly a good dispersion of nanotubes. A notable improvement in the crystallinity of UPR from 14 to 21 % after MWCNTs inclusion was observed by X-ray diffractometry. The mechanical properties, such as tensile strength, tensile modulus, impact strength, and elongation-at-break, of nanocomposite were found to be increased to 22, 20, 28, and 87 %, respectively. The estimated melting enthalpy per gram for composites as analyzed by differential scanning calorimetry is higher than that of UPR. The onset temperature of thermal decomposition in the nanocomposites as monitored by thermogravimetric analysis is found higher than that of UPR. Correlations among MWCNTs dispersion, nucleation, fracture morphology, and various properties were measured and reported.

  14. Mechanical and electrical properties of a polyester resin reinforced with clay-based fillers

    Energy Technology Data Exchange (ETDEWEB)

    Buncianu, Dorel; Jadaneant, Mihai [UPT Timisoara, Timisoara (Romania); Tessier-Doyen, Nicolas; Absi, Joseph [Centre Européen de la Céramique, Limoges Cedex (France); Courreges, Fabien [Laboratoire XLIM, 123, Limoges Cedex (France)

    2017-03-15

    In this study, composite polymer-based materials were fabricated, in which a significant proportion of polyester resin was substituted by low-cost and environmentally-friendly clay-based raw materials. The main objective is to improve mechanical properties while maintaining a reasonable electrical insulating behavior. A homogenized distribution of fillers within the matrix compatible with the processing parameters was obtained up to a maximum added fraction of 20 vol%. Mechanical characterization using uniaxial traction tests and Charpy impact pendulum machine showed that stress-to-rupture can be enhanced of approximately 25 %. In addition, fracture energy was doubled for the best formulation. Dielectric constant was decreased and loss factor was slightly increased when electrical resistivity remained almost constant. In general, the composite materials with metakaolin fillers exhibited higher mechanical properties and greater electrical insulating behavior. Microstructural observation showed the presence of decohesive agglomerates of particles at the interface with the matrix. The mechanical properties were found to be more sensitive than electrical properties to the homogeneity of filler dispersion in the matrix.

  15. Polyester-toner electrophoresis microchips with improved analytical performance and extended lifetime.

    Science.gov (United States)

    Gabriel, Ellen Flávia Moreira; Duarte Junior, Gerson F; Garcia, Paulo de Tarso; de Jesus, Dosil P; Coltro, Wendell K T

    2012-09-01

    This paper reports the fabrication of polyester-toner (PT) electrophoresis microchips with improved analytical performance and extended lifetime. This has been achieved with a better understanding about the EOF generation and the influence of some parameters including the channel dimensions (width and depth), the injection mode, and the addition of organic solvent to the running buffer. The analytical performance of the PT devices was investigated using a capacitively coupled contactless conductivity detector and inorganic cations as model analytes. The proposed devices have exhibited EOF values of (3.4 ± 0.2) × 10(-4) cm(2) V(-1) s(-1) with good stability over 25 consecutive runs. It has been found that the EOF magnitude depends on the channel dimension, i.e. the wider the channel, the higher the EOF value. The separation efficiency for inorganic cations ranged from 13 000 to 50 000 plates/m. The LOD found for K(+) , Na(+) , and Li(+) were 4.2, 7.3, and 23 μM, respectively. In addition, the same PT device has been used by three consecutive days. Lately, due to improved analytical performance, it was carried out by the first time the detection of inorganic cations in real samples such as energetic drinks and pharmaceutical formulations.

  16. Versatile Biodegradable Poly(ester amides Derived from α-Amino Acids for Vascular Tissue Engineering

    Directory of Open Access Journals (Sweden)

    Pooneh Karimi

    2010-03-01

    Full Text Available Biodegradable poly(ester amide (PEA biomaterials derived from α-amino acids, diols, and diacids are promising materials for biomedical applications such as tissue engineering and drug delivery because of their optimized properties and susceptibility for either hydrolytic or enzymatic degradation. The objective of this work was to synthesize and characterize biodegradable PEAs based on the α-amino acids L-phenylalanine and L-methionine. Four different PEAs were prepared using 1,4-butanediol, 1,6-hexanediol, and sebacic acid by interfacial polymerization. High molecular weight PEAs with narrow polydispersity indices and excellent film-forming properties were obtained. The incubation of these PEAs in PBS and chymotrypsin indicated that the polymers are biodegradable. Human coronary artery smooth muscle cells were cultured on PEA films for 48 h and the results showed a well-spread morphology. Porous 3D scaffolds fabricated from these PEAs were found to have excellent porosities indicating the utility of these polymers for vascular tissue engineering.

  17. Fungal Communities Associated with Degradation of Polyester Polyurethane in Soil▿

    OpenAIRE

    Cosgrove, Lee; McGeechan, Paula L.; Robson, Geoff D.; Handley, Pauline S.

    2007-01-01

    Soil fungal communities involved in the biodegradation of polyester polyurethane (PU) were investigated. PU coupons were buried in two sandy loam soils with different levels of organic carbon: one was acidic (pH 5.5), and the other was more neutral (pH 6.7). After 5 months of burial, the fungal communities on the surface of the PU were compared with the native soil communities using culture-based and molecular techniques. Putative PU-degrading fungi were common in both soils, as 80% of cultiv...

  18. Bending Mechanical Behavior of Polyester Matrix Reinforced with Fique Fiber

    Science.gov (United States)

    Altoé, Giulio Rodrigues; Netto, Pedro Amoy; Barcelos, Mariana; Gomes, André; Margem, Frederico Muylaert; Monteiro, Sergio Neves

    Environmentally correct composites, made from natural fibers, are among the most investigated and applied today. In this paper, we investigate the mechanical behavior of polyester matrix composites reinforced with continuous fique fibers, through bending tensile tests. Specimens containing 0, 10, 20 and 30% in volume of fique fiber were aligned along the entire length of a mold to create plates of these composites, those plates were cut following the ASTM standard to obtained bending tests specimens. The test was conducted in a Instron Machine and the fractured specimens were analyzed by SEM, the results showed the increase in the materials tensile properties with the increase of fiber amount.

  19. SYNTHESIS OF AN EPOXY-TERMINATED HYPERBRANCHED AROMATIC POLYESTER

    Institute of Scientific and Technical Information of China (English)

    Xia Wang; W.J. Feast

    2002-01-01

    An epoxy-terminated hyperbranched aromatic polyester (P3) was synthesized from a hyperbranched aromaticpolyester containing carboxylic acid end groups (P1), which was derived from the condensation polymerization of the AB2monomer, 5-acetoxyisophthalic acid. Polymer P1 was converted into the polymeric acid chloride by reaction with thionylchloride. The acid chloride was reacted with ethanol and glycidol to form a poly(ethyl ester) (P2) and an epoxy terminatedmaterial (P3), respectively. The reaction conditions in each step of these processes had to be controlled very carefully toavoid unwanted cross-linking reactions. The characterization of products and intermediates, including molecular weightdistributions and thermal properties, are reported.

  20. Post-irradiation crosslinking of partially cured unsaturated polyester resin

    Energy Technology Data Exchange (ETDEWEB)

    Jurkin, Tanja [Ruder Boskovic Institute, POB 180, Zagreb (Croatia); Pucic, Irina [Ruder Boskovic Institute, POB 180, Zagreb (Croatia)]. E-mail: pucic@rudjer.irb.hr

    2006-09-15

    The post-irradiation crosslinking of unsaturated polyester (UP) resin samples irradiated to different doses was monitored during the 15-days period. The post-reaction sensitivity of three experimental techniques was evaluated. Significant changes were detected by extraction analysis that also included determination of the free styrene content. The most substantial changes were detected by differential scanning calorimetry, even up to 5 days after the irradiation. The sensitivity and reproducibility of FTIR was the lowest. The first two techniques detected the influence of particular reaction periods, at which the radiation crosslinking was terminated, on the post-reaction.

  1. Post-irradiation crosslinking of partially cured unsaturated polyester resin

    Science.gov (United States)

    Jurkin, Tanja; Pucić, Irina

    2006-09-01

    The post-irradiation crosslinking of unsaturated polyester (UP) resin samples irradiated to different doses was monitored during the 15-days period. The post-reaction sensitivity of three experimental techniques was evaluated. Significant changes were detected by extraction analysis that also included determination of the free styrene content. The most substantial changes were detected by differential scanning calorimetry, even up to 5 days after the irradiation. The sensitivity and reproducibility of FTIR was the lowest. The first two techniques detected the influence of particular reaction periods, at which the radiation crosslinking was terminated, on the post-reaction.

  2. Investigation into the UV-Protection of Woven Fabrics Composed of Metallic Weft Yarns

    Directory of Open Access Journals (Sweden)

    Ghane Mohammad

    2016-09-01

    Full Text Available The destructive effects of sun UV radiation on human skins are now very clear to everyone. Most of the present studies were focused on the fabrics’ structural parameters such as density, warp and weft yarns finenesses, fabric pattern and printing or finishing treatments applied to the fabrics. The aim of this work is achieving a technique through which the produced fabrics possess a higher UV-protection ability. For this purpose, two different metals including aluminium and copper yarns were employed in fabrics production process and their effects on UV-protection ability of the produced fabrics were investigated. Six different fabric samples comprised of either cotton/polyester, nylon yarns as the warp yarns as well as either aluminium or copper yarns as the weft yarns were produced. Using the spectrophotometer technique, which is known as one of the UPF measuring method, the absorbency and reflectivity of fabrics within the specified range of electromagnetic waves (specially the UV radiation were determined. The results illustrated that the higher UV absorbency was related to the fabric possessing the copper yarns in their structures. It was concluded that the absorption ability of nylon fabrics is higher than that of the cotton/polyester samples.

  3. Antimicrobial hyperbranched poly(ester amide)/polyaniline nanofiber modified montmorillonite nanocomposites

    Energy Technology Data Exchange (ETDEWEB)

    Pramanik, Sujata [Advanced Polymer and Nanomaterial Laboratory, Department of Chemical Sciences, Tezpur University, Tezpur 784028 (India); Bharali, Pranjal; Konwar, B.K. [Department of Molecular Biology and Biotechnology, Tezpur University, Tezpur 784028 (India); Karak, Niranjan, E-mail: karakniranjan@yahoo.com [Advanced Polymer and Nanomaterial Laboratory, Department of Chemical Sciences, Tezpur University, Tezpur 784028 (India)

    2014-02-01

    There has been growing interest in the use of nanomaterials featuring potent of antimicrobial activity in the biomedical domain. It still remains a challenge for the researchers to develop an efficient nanocomposite possessing antimicrobial efficacy against broad spectrum microbes including bacteria, fungi as well as algal consortium, posing serious challenges for the human survival. In addressing the above problem, we report the fabrication of bio-based hyperbranched poly(ester amide) (HBPEA)/polyaniline nanofiber modified montmorillonite (MMT) nanocomposites by an ex-situ polymerization technique at varied weight percentages (1, 2.5, 5 wt.%) of the modified MMT (nanohybrid). The Fourier transform infrared spectroscopy confirmed the structural changes upon interaction of the nanohybrid with HBPEA. A probable mechanism is proposed for the formation of nanocomposites with partially exfoliated nanoplatelet structure, which was further confirmed from the high resolution transmission electron microscopic analyses. The prepared nanocomposites exhibited potent efficacy against gram positive bacteria like Bacillus subtilis and Staphylococcus aureus as compared to the gram negative ones like Pseudomonas aeruginosa and Escherichia coli. The nanocomposites showed significant antifungal activity against Aspergillus niger, Fusarium oxysporum and Coleotricum capcii and antialgal activity against algal consortium comprising of Chlorella, Hormidium and Cladophorella species. The formation of thermosetting nanocomposites resulted in the acceptable improvement of desired physico-chemical and mechanical properties including thermostability. Thus pronounced antimicrobial activity of the nanocomposites against a spectrum of bacterial and fungal strains as well as a consortium of algal species along with other desired performance vouched them as potent antimicrobial materials in the realm of health and biomedical industry. - Highlights: • A possible approach for fabrication of the

  4. The Research on Recycling Technology for Waste Polyester/Cotton Textiles%废旧涤棉类织物再利用技术的发展

    Institute of Scientific and Technical Information of China (English)

    郜娟; 史晟; 龚艳勃; 焦鑫; 侯文生; 戴晋明

    2016-01-01

    再利用技术的发展是促进废旧纺织品回收再利用的根本。本文从纺织品与环境资源的关系着手,综述了近年来废旧涤棉类纺织品再利用技术方面的发展现状。分析后得出:涤棉类织物再利用技术发展较快;物理法从简单的机械利用向物理熔融和溶解多元化方向发展;化学法从传统的造纸或降解向生物质材料应用方向发展;生物酶解技术也得到了关注。另外,涤棉混纺织物从只利用涤纶或棉纤维的单一模式向综合利用发展,同时越来越多的跨学科研究融入到废旧涤棉织物再利用技术上来。目前,一些研究方法虽已初步应用,但由于技术的局限性,再利用情况仍不乐观。%The development of reuse technology is the key to promoting the recycling of waste textiles. By reviewing the relationship between textiles and environmental resources, this paper summarizes the development status-quo of the recycling technology for waste polyester/cotton textiles. It draws the conclusion that, the recycling technology for polyester/cotton textiles is growing at a faster speed; physical method is being diversiifed from simple mechanically reuse to physical melting and dissolving, etc., while chemical method is also developing from traditional papermaking or degradation to making biomass materials; and moreover, biological enzymolysis technology receives increasing attention. In addition, the reuse pattern of polyester/cotton blended fabrics is developing from using either polyester ifber or cotton ifber to comprehensive use. In the meantime, more and more interdisciplinary researchers have involved in developing the recycling technology for waste polyester/cotton textiles. Currently, although some research methods have been put into practice, the situation of reusing this kind of wastes is still not optimistic due to the limitations of technology.

  5. Sponge Gourd (Luffa Cylindrica Reinforced Polyester Composites: Preparation and Properties

    Directory of Open Access Journals (Sweden)

    Valcineide O.A. Tanobe

    2014-05-01

    Full Text Available Increasing environmental concern along with the drive to find substitutes for synthetic fibers and value added applications for low cost and renewable plant fibers have led to the development of composites based on biomaterials. One of the drawbacks encountered in such exercise is the lack of adhesion between the incorporated plant fibers and synthetic polymeric matrices. Such drawback can be reduced by appropriate treatment of fibers. This paper describes the chemical treatments used on sponge gourd (Luffa cylindrica fibers of Brazil to prepare their composites with polyester resin. Production of short fiber-polymer composite as well as mat-polyester composites is presented here. Characterization of the composites in respect of evaluation of density, water absorption, thermalstability, tensile properties and impact strength were made and the results are discussed. Observed impact strengthand tensile properties are discussed based on the fractographic studies of the composites.Defence Science Journal, Vol. 64, No. 3, May 2014, pp. 273-280, DOI:http://dx.doi.org/ 10.14429/dsj.64.7327

  6. Glass fibres reinforced polyester composites degradation monitoring by surface analysis

    Energy Technology Data Exchange (ETDEWEB)

    Croitoru, Catalin [“Transilvania” University of Brasov, Materials Engineering and Welding Department, Eroilor 29 Str., 500036 Brasov (Romania); Patachia, Silvia, E-mail: st.patachia@unitbv.ro [“Transilvania” University of Brasov, Product Design Environment and Mechatronics Department, Eroilor 29 Str., 500036 Brasov (Romania); Papancea, Adina [“Transilvania” University of Brasov, Product Design Environment and Mechatronics Department, Eroilor 29 Str., 500036 Brasov (Romania); Baltes, Liana; Tierean, Mircea [“Transilvania” University of Brasov, Materials Engineering and Welding Department, Eroilor 29 Str., 500036 Brasov (Romania)

    2015-12-15

    Highlights: • Glass fibre-reinforced polyester composites surface analysis by photographic method. • The composites are submitted to accelerated ageing by UV irradiation at 254 nm. • The UV irradiation promotes differences in the surface chemistry of the composites. • MB dye is differently adsorbed on surfaces with different degradation degrees. • Good correlation between the colouring degree and surface chemistry. - Abstract: The paper presents a novel method for quantification of the modifications that occur on the surface of different types of gel-coated glass fibre-reinforced polyester composites under artificial UV-ageing at 254 nm. The method implies the adsorption of an ionic dye, namely methylene blue, on the UV-aged composite, and computing the CIELab colour space parameters from the photographic image of the coloured composite's surface. The method significantly enhances the colour differences between the irradiated composites and the reference, in contrast with the non-coloured ones. The colour modifications that occur represent a good indicative of the surface degradation, alteration of surface hydrophily and roughness of the composite and are in good correlation with the ATR-FTIR spectroscopy and optical microscopy results. The proposed method is easier, faster and cheaper than the traditional ones.

  7. Non-isothermal Crystallization Kinetics of Kaolin Modified Polyester

    Institute of Scientific and Technical Information of China (English)

    ZHANG Ruixin; GU Mingbo; CHEN Guoqiang

    2011-01-01

    Fiber-class modified kaolin and PET have been blended in the twin-screw and granulated to chips containing 4 wt% of kaolin.Non-isothermal crystallization process of kaolin modified polyester was investigated using a differential scanning calorimetry (DSC),and the addition of kaolin enhances either the melting temperature (Tm) or the crystallization temperature (Tc).The morphology of kaolin modified polyester,the melt of which is cooled at different cooling rate,was observed by scanning electron microscope (SEM).The relationship between Tc and cooling rate F was studied.Semi-crystalline phase t1/2 makes an exponential decline with increasing F,and the higher the cooling rate,the shorter the time of crystallization completion.Non-isothermal crystallization kinetics parameters and the activation energy were calculated,indicating that the higher rate of cooling needs the higher relative crystallinity in the unit crystallization time,the crystallization rate increased while speeding up the temperature reduction,and the activation energy AE was calculated to be -204.1566 kJ/mol for the non-isothermal crystallization processes by the Kissinger's methods.

  8. Factors Influencing Anti-ultraviolet Performance of Undyed-woven Fabrics

    Institute of Scientific and Technical Information of China (English)

    ZHOU Rong; DING Xin

    2005-01-01

    Main factors influencing anti-ultraviolet performance of woven fabrics are investigated. By means of detailed arrangement of sample design, sample making, testing and analyzing, it shows that fiber materials, fabric compactness, fabric weave and yarn type are the four important factors influencing anti-UV performance of woven fabric, but with different effects. Among them fiber material is the most important factor. For the common fiber materials used, it shows that the anti-UV performance of polyester is comparatively better than others. Once fiber material is determined, fabric with medium float weave and high compactness can offer a good anti-UV performance.The anti-UV performance of fabric with "anti-UV" filament yarn is better than that with "anti-UV" staple yarn. The anti-UV property of fabrics with untwisted filament yarns is better than that with twist counterparts.

  9. Quantification of perchloroethylene residues in dry-cleaned fabrics.

    Science.gov (United States)

    Sherlach, Katy S; Gorka, Alexander P; Dantzler, Alexa; Roepe, Paul D

    2011-11-01

    We have used a novel gas chromatography/mass spectrometry (GC/MS)-based approach to quantify perchloroethylene (PCE) residues in dry-cleaned fabrics. Residual PCE was extracted from fabric samples with methanol and concentration was calculated by the gas chromatographic peak area, standardized using PCE calibration data. Extracts examined were from samples of 100% wool, polyester, cotton, or silk, which were dry cleaned from one to six times in seven different Northern Virginia dry-cleaning establishments. Additional experiments were conducted to investigate the kinetics of PCE release in the extraction solvent and to the open air. We found that polyester, cotton, and wool retained ≥ µM levels of PCE, that these levels increased in successive dry-cleaning cycles, and that PCE is slowly volatilized from these fabrics under ambient room air conditions. We found that silk does not retain appreciable PCE. Measured differences across dry-cleaning establishments and fabric type suggest more vigorous monitoring of PCE residues may be warranted. Environ. Toxicol. Chem. 2011;30:2481-2487. © 2011 SETAC.

  10. Functional finishing of aminated polyester using biopolymer-based polyelectrolyte microgels.

    Science.gov (United States)

    Glampedaki, Pelagia; Dutschk, Victoria; Jocic, Dragan; Warmoeskerken, Marijn M C G

    2011-10-01

    This study focuses on a microgel-based functionalization method applicable to polyester textiles for improving their hydrophilicity and/or moisture-management properties, eventually enhancing wear comfort. The method proposed aims at achieving pH-/temperature-controlled wettability of polyester within a physiological pH/temperature range. First, primary amine groups are created on polyester surfaces using ethylenediamine; second, biopolymer-based polyelectrolyte microgels are incorporated using the natural cross-linker genipin. The microgels consist of the pH-responsive natural polysaccharide chitosan and pH/thermoresponsive poly(N-isopropylacrylamide-co-acrylic acid) microparticles. Scanning electron microscopy confirmed the microgel presence on polyester surfaces. X-ray photoelectron spectroscopy revealed nitrogen concentration, supporting increased microscopy results. Electrokinetic analysis showed that functionalized polyester surfaces have a zero-charge point at pH 6.5, close to the microgel isoelectric point. Dynamic wetting measurements revealed that functionalized polyester has shorter total water absorption time than the reference. This absorption time is also pH dependent, based on dynamic contact angle and micro-roughness measurements, which indicated microgel swelling at different pH values. Furthermore, at 40 °C functionalized polyester has higher vapor transmission rates than the reference, even at high relative humidity. This was attributed to the microgel thermoresponsiveness, which was confirmed through the almost 50% decrease in microparticle size between 20 and 40 °C, as determined by dynamic light scattering measurements.

  11. The biomechanical evaluation of polyester as a tension band for the internal fixation of patellar fractures.

    LENUS (Irish Health Repository)

    McGreal, G

    2012-02-03

    We use a braided polyester suture in place of cerclage wire in tension band fixations. The objective of this study was to test the biomechanical properties of this technique. Sixteen cadaveric patellae were fractured and repaired by modified tension band fixation. Eight were fixed using eighteen gauge stainless steel wire as a tension band and eight using braided polyester. All specimens were subjected to tensile testing. Polyester was 75.0% as strong as wire. For dynamic testing, the patellae of seven cadaveric knees were fractured and then fixed with polyester tension bands. These were mounted in a device capable of extending the knees from 90 degrees to neutral against an applied force. None of the fixations failed. Three of the specimens fixed using 18 gauge stainless steel wire were compared with three fixed using polyester over 2000 cycles of knee flexion and extension. Polyester performed as well as wire. We conclude that polyester is an acceptable alternative to wire in tension band fixation.

  12. Microbial degradation of aliphatic and aliphatic-aromatic co-polyesters.

    Science.gov (United States)

    Shah, Aamer Ali; Kato, Satoshi; Shintani, Noboru; Kamini, Numbi Ramudu; Nakajima-Kambe, Toshiaki

    2014-04-01

    Biodegradable plastics (BPs) have attracted much attention since more than a decade because they can easily be degraded by microorganisms in the environment. The development of aliphatic-aromatic co-polyesters has combined excellent mechanical properties with biodegradability and an ideal replacement for the conventional nondegradable thermoplastics. The microorganisms degrading these polyesters are widely distributed in various environments. Although various aliphatic, aromatic, and aliphatic-aromatic co-polyester-degrading microorganisms and their enzymes have been studied and characterized, there are still many groups of microorganisms and enzymes with varying properties awaiting various applications. In this review, we have reported some new microorganisms and their enzymes which could degrade various aliphatic, aromatic, as well as aliphatic-aromatic co-polyesters like poly(butylene succinate) (PBS), poly(butylene succinate)-co-(butylene adipate) (PBSA), poly(ε-caprolactone) (PCL), poly(ethylene succinate) (PES), poly(L-lactic acid) (PLA), poly(3-hydroxybutyrate) and poly(3-hydoxybutyrate-co-3-hydroxyvalterate) (PHB/PHBV), poly(ethylene terephthalate) (PET), poly(butylene terephthalate) (PBT), poly(butylene adipate-co-terephthalate (PBAT), poly(butylene succinate-co-terephthalate) (PBST), and poly(butylene succinate/terephthalate/isophthalate)-co-(lactate) (PBSTIL). The mechanism of degradation of aliphatic as well as aliphatic-aromatic co-polyesters has also been discussed. The degradation ability of microorganisms against various polyesters might be useful for the treatment and recycling of biodegradable wastes or bioremediation of the polyester-contaminated environments.

  13. Synthesis of Malononitrile-Condensed Disperse Dyes and Application on Polyester and Nylon Fabrics

    OpenAIRE

    2014-01-01

    An active methylene compound, malononitrile, was introduced into the structures of a series of disperse dyes previously prepared by coupling phloroglucinol, barbituric acid, and α and β-naphtho to 4-amino-3-nitrobenzaldehyde. The dyes were purified by recrystallization from ethanol. The purity of the dyes was examined by thin-layer chromatography (TLC) and the dyes were characterized by visible absorption and Fourier transform infrared spectroscopy (FTIR). The malononitrile-condensed dyes pro...

  14. Water resistance and surface morphology of synthetic fabrics covered by polysiloxane/acrylate followed by electron beam irradiation

    Energy Technology Data Exchange (ETDEWEB)

    El-Naggar, A.M. E-mail: ab_nagga@yahoo.com; Zohdy, M.H.; Mohammed, S.S.; Alam, E.A

    2003-04-01

    Different synthetic fabrics were treated by electron beam surface coating with two formulations based on polydimethylsiloxane (PDMS) and polystyrene (PS) or poly(methyl methacrylate) (PMMA) oligomers. The water resistance properties were investigated in terms of the percentage of water repellency and absorption. Also, the surface coated fabrics were examined by scanning electron microscopy/microscope (SEM) connected to an energy dispersive X-ray (EDX) unit to determine the percentage atomic contents of elements. The results showed that the adhesion of the polysiloxane formulation to the surface depends largely on the kind of acrylate oligomer and textile fabric as indicated by the EDX analysis for silicon. In this regard, PDMS/PS formulation is more compatible with polyester and nylon-6 fabrics than PDMS/PMMA one. However, it was found that PDMS/PMMA formulation is more compatible with cotton/polyester blend than PDMS/PS. The SEM micrographs give further supports to the EDX analysis. On the basis of the percentage of water repellency and absorption, polyester fabric displayed the highest water resistance properties among the studied textile fabrics regardless of the used polysiloxane formulation.

  15. Immobilization and characterization of inulinase from Ulocladium atrum on nonwoven fabrics

    Indian Academy of Sciences (India)

    Tarek M Mohamed; Soad M Abu El-Souod; Ehab M Ali; Mohammed O El-Badry; Mai M El-Keiy; Aly Sayed Aly

    2014-12-01

    Ulocladium atrum inulinase was immobilized on different composite membranes composed of chitosan/nonwoven fabrics. Km values of free and immobilized U. atrum inulinase on different composite membranes were calculated. The enzyme had optimum pH at 5.6 for free and immobilized U. atrum inulinase on polyester nonwoven fabric coated with 3% chitosan solution (PPNWF3), but optimum pH was 5 for immobilized U. atrum inulinase on polyester and polypropylene nonwoven fabrics coated with 1% chitosan solution. The enzyme had optimum temperature at 40°C for immobilized enzyme on each of polyester and polypropylene composite membranes coated with 1% chitosan, while it was 50°C for free and immobilized enzyme on polypropylene nonwoven fabric coated with 3% chitosan solution. Free U. atrum inulinase was stable at 40°C but thermal stability of the immobilized enzyme was detected up to 60°C. Reusability of immobilized enzyme was from 38 to 42 cycles of reuse; after this, the immobilized enzyme lost its activity completely. In conclusion, immobilized U. atrum inulinase was considerably more stable than the free enzyme, and could be stored for extended periods.

  16. Preparation and characterization of polymer blends based on recycled PET and polyester derived by terephthalic acid; Preparacao e caracterizacao de blendas polimericas a base de PET reciclado e poliester derivado do acido tereftalico

    Energy Technology Data Exchange (ETDEWEB)

    Ohara, L.; Miranda, C.S.; Fiuza, R.P.; Luporini, S.; Carvalho, R.F.; Jose, N.M., E-mail: leandro.ohara@gmail.co [Universidade Federal da Bahia (GECIM/UFBA), Salvador, BA (Brazil). Inst. de Quimica. Grupo de Energia e Ciencias dos Materiais

    2010-07-01

    Environmentally friendly materials, made from industrial waste, are being increasingly used as a solution to the growing amount of waste generated by society, but also as a cheaper alternative to replace conventional materials for use in construction. In this work were investigated the properties of polymer blends based on recycled PET and a polyester derived from terephthalic acid and glycerin, a co-product of biodiesel. The samples were characterized by XRD, TGA, DSC, FTIR and SEM. The polyester synthesized showed a degradation event near 300 deg C. The blends with higher ratio of PET showed thermal behavior similar to pure PET. The X-ray diffraction showed that the polymer blends are semicrystalline materials. The micrographs presents the presence of a smooth surface, indicating the possibility of miscibility between the arrays. Therefore, the blending makes possible the fabrication of low-cost materials with applications in several areas. (author)

  17. STUDY ON THE BLENDS OF NYLON 66 AND LIQUID CRYSTALLINE POLYESTERS

    Institute of Scientific and Technical Information of China (English)

    Zhang Shufan; Ren Jinghong

    1991-01-01

    Blends of polyamide (Nylon 66 ) with two different kinds of liquid crystalline polyesters were studied in all the composition range. Homogeneous samples were obtained by coprecipitation from 2wt%. solution of blends. The thermal properties, crystallinity and morphology of these blends were studied by using DSC, polarizing microscopy, and scanning electron microscopy. The phase transition and morphology of the blends are markedlyinfluenced by the composition of liquid crystalline polyesters. The mechanical behaviour of PHB/HNA-Nylon 66 blend was improved .although polyamide (Nylon 66)with the liquid crystalline polyesters were incompatible, but a rather strong interaction between the polymers did exist.

  18. Investigation of Mechanical Properties of Unidirectional Steel Fiber/Polyester Composites: Experiments and Micromechanical Predictions

    DEFF Research Database (Denmark)

    Raghavalu Thirumalai, Durai Prabhakaran; Løgstrup Andersen, Tom; Bech, Jakob Ilsted

    2016-01-01

    The article introduces steel fiber reinforced polymer composites, which is considered new for composite product developments. These composites consist of steel fibers or filaments of 0.21 mm diameter embedded in a polyester resin. The goal of this investigation is to characterize the mechanical...... performance of steel fiber reinforced polyester composites at room temperature. The mechanical properties of unidirectional steel fiber reinforced polyester composites (SFRP) are evaluated experimentally and compared with the predicted values by micro-mechanical models. These predictions help to understand...

  19. Effect of Blending Ratio on the Properties of Ramie/Polyester Blended Yarn

    Institute of Scientific and Technical Information of China (English)

    YU Wen

    2002-01-01

    The effects of the blending ratio on the properties of Ramie/Polyester blended yarns are discussed in this paper. The experimental results show that the elongation of the yarn with the polyester content more than 40% is better than that of others. There is a lowest tenacity of the yarn corresponding to the blending ratio of 50/50 or so. The other properties of the yarn, such as the evenness and hairiness, will be improved with the increasing of the polyester content.

  20. One-bath Dyeing of Polyester/Wool Blend with Disperse Dyes

    Institute of Scientific and Technical Information of China (English)

    蔡翔; 宋心远

    2001-01-01

    The role of auxiliary LAB as vehicle in dyeing polyester/wool blends with disperse dyes is described. Dye exhaustion and bonding on polyester/wool samples are studied under different experimental conditions - the LAB amount, the temperature and pH value- to achieve optimum conditions. The results are compared with those obtained with and without conventional dyeing auxiliary products. Although dye exhaustion is higher in the presence of commercial carriers, the dye bonded increases markedly in the presence of auxiliary LAB in both fibers. The role played by auxiliary LAB in polyester/wool blend dyeing can provide a new method for this process.

  1. Synthesis of Disperse Dyes from Pyridone and Resorcinol Coupled to Diazotized 2-Amino-4-chloro-5-formylthiazole and Application to Polyester

    Directory of Open Access Journals (Sweden)

    Yusuf Y. Lams

    2014-01-01

    Full Text Available The aim of this study was to synthesize disperse dyes in the derivative of 2-amino-4-chloro-5-formylthiazole by conventional diazotization and couplings with pyridone and resorcinol. The dyes were characterized by visible absorption spectroscopy, IR spectral studies, and 1H and 13C NMR. The pyridone and resorcinol substituted dyes exhausted well with good depth on 100% polyester fabrics with a shade of brown and purple colours, respectively. The heteroatom and the intrinsic conjugation in the thiazole structure results in high bathochromic shifts and lead to brightness of shades. The dyed fabrics showed very good to excellent wash fastness and moderate to good light and perspiration fastness properties.

  2. Geometrical Modeling of Woven Fabrics Weavability-Limit New Relationships

    Directory of Open Access Journals (Sweden)

    Dalal Mohamed

    2017-03-01

    Full Text Available The weavability limit and tightness for 2D and 3D woven fabrics is an important factor and depends on many geometric parameters. Based on a comprehensive review of the literature on textile fabric construction and property, and related research on fabric geometry, a study of the weavability limit and tightness relationships of 2D and 3D woven fabrics was undertaken. Experiments were conducted on a representative number of polyester and cotton woven fabrics which have been woven in our workshop, using three machines endowed with different insertion systems (rapier, projectiles and air jet. Afterwards, these woven fabrics have been analyzed in the laboratory to determine their physical and mechanical characteristics using air permeability-meter and KES-F KAWABATA Evaluation System for Fabrics. In this study, the current Booten’s weavability limit and tightness relationships based on Ashenhurst’s, Peirce’s, Love’s, Russell’s, Galuszynskl’s theory and maximum-weavability is reviewed and modified as new relationships to expand their use to general cases (2D and 3D woven fabrics, all fiber materiel, all yarns etc…. The theoretical relationships were examined and found to agree with experimental results. It was concluded that the weavability limit and tightness relationships are useful tools for weavers in predicting whether a proposed fabric construction was weavable and also in predicting and explaining their physical and mechanical properties.

  3. Digital fabrication

    CERN Document Server

    2012-01-01

    The Winter 2012 (vol. 14 no. 3) issue of the Nexus Network Journal features seven original papers dedicated to the theme “Digital Fabrication”. Digital fabrication is changing architecture in fundamental ways in every phase, from concept to artifact. Projects growing out of research in digital fabrication are dependent on software that is entirely surface-oriented in its underlying mathematics. Decisions made during design, prototyping, fabrication and assembly rely on codes, scripts, parameters, operating systems and software, creating the need for teams with multidisciplinary expertise and different skills, from IT to architecture, design, material engineering, and mathematics, among others The papers grew out of a Lisbon symposium hosted by the ISCTE-Instituto Universitario de Lisboa entitled “Digital Fabrication – A State of the Art”. The issue is completed with four other research papers which address different mathematical instruments applied to architecture, including geometric tracing system...

  4. Fabrication of cotton nano-powder and its textile application

    Institute of Scientific and Technical Information of China (English)

    GUAN YingTing; LI Yi

    2008-01-01

    A combination of chemical and mechanical treatment of cotton produced cotton powder (fibrils) with a mean diameter of 97 nm is analyzed by Laser Particle Size Analyzer. Transmission Electron Micro scope (TEM) study showed that the diameter of the fibrils was about 10-30 nm and the length was from 70nm to over 400 nm. The powder was then coated onto fabrics (100% polyester fabric, 100% wool fabric and 100% cotton fabric). Scanning Electron Microscope (SEM) study showed that cotton fibrils were adhered to the surface of treated fabrics (fibers). The ultraviolet protection factor (UPF) value (AS/NZS 4399:1996) for cotton fabrics increased about 20% after the treatment. This implies that the treated samples give a better protection from UV light. The moisture management test (MMT) of the fabrics such as wetting time at bottom, top maximum absorption rate, bottom maximum absorption rate, bottom maximum wetted radius and bottom spreading speed, et al., showed that there were significant changes after the treatment. These changes gave better moisture management ability to the treated fabrics and thus made the fabric more comfortable. However, Wide-angle X-ray Diffraction and Fourie Transform Infrared Spectroscopy analysis proved that supermolecular structure and chemical structure of treated fabrics were the same as the original fabrics. Other properties of the treated fabric such as thermal conductivity, wrinkle recovery, hand, et al., did not change. This implied that the basic function of the treated fabrics for the clothing industry was the same as untreated fabrics. This study is a foundation for further researches on textile application.

  5. Morphological and biodegradability studies of Euphorbia latex modified polyester - Banana fiber composites

    Science.gov (United States)

    Rai, Bhuvneshwar; Kumar, Gulshan; Diwan, R. K.

    2016-05-01

    The composites of Banana fiber were prepared using polyester resin blended Euphorbia coagulum, morphology and the degree of rate of aerobic biodegradation of the prepared composites were studied. Polyester resin blended Euphorbia coagulum containing Banana fiber, Euphorbia coagulum and polyester resin taken in the ratio 40: 24: 36 was used for the study, which was the optimum composition of the composite reported in a previous study by the authors. In the biodegradability study cellulose has been used as positive reference material. Result shows that Euphorbia coagulum modified polyester - Banana fiber composites exhibited biodegradation to the extent of around 40%. The use of developed green composites may help in reducing the generation of non-biodegradable polymeric wastes.

  6. Azobenzene Polyesters Used as Gate‐Like Scaffolds in Nanoscopic Hybrid Systems

    DEFF Research Database (Denmark)

    Bernardos, Andrea; Mondragón, Laura; Javakhishvili, Irakli

    2012-01-01

    The synthesis and characterisation of new capped silica mesoporous nanoparticles for on‐command delivery applications is reported. Functional capped hybrid systems consist of MCM‐41 nanoparticles functionalised on the external surface with polyesters bearing azobenzene derivatives and rhodamine B...

  7. Effect of polyester fiber reinforcement on the mechanical properties of interim fixed partial dentures

    Directory of Open Access Journals (Sweden)

    N. Gopichander

    2015-10-01

    Conclusion: Within the limitations of this study, polyester fiber reinforcements improved the mechanical properties of heat-polymerized PMMA, cold-polymerized PMMA, and bis-acrylic provisional FPD materials.

  8. Fully Biobased Unsaturated Aliphatic Polyesters from Renewable Resources : Enzymatic Synthesis, Characterization, and Properties

    NARCIS (Netherlands)

    Jiang, Yi; Alberda van Ekenstein, Gerhard; Woortman, Albert J. J.; Loos, Katja

    2014-01-01

    Fully biobased saturated and unsaturated aliphatic polyesters and oligoesters are successfully prepared by Candida antarctica lipase B (CALB)-catalyzed polycondensations of succinate, itaconate, and 1,4-butanediol. The effects of monomer substrates and polymerization methods on enzymatic polycondens

  9. Fully Biobased Unsaturated Aliphatic Polyesters from Renewable Resources : Enzymatic Synthesis, Characterization, and Properties

    NARCIS (Netherlands)

    Jiang, Yi; Alberda van Ekenstein, Gerhard; Woortman, Albert J. J.; Loos, Katja

    2014-01-01

    Fully biobased saturated and unsaturated aliphatic polyesters and oligoesters are successfully prepared by Candida antarctica lipase B (CALB)-catalyzed polycondensations of succinate, itaconate, and 1,4-butanediol. The effects of monomer substrates and polymerization methods on enzymatic

  10. Tensile properties of bacterial cellulose nanofibers - polyester composites

    Science.gov (United States)

    Abral, H.; Mahardika, M.

    2016-07-01

    The paper shows tensile properties of bacterial cellulose (BC) nanofibers and polyester (PO) matrix composites. Tensile properties including tensile strength (TS), modulus elasticity (ME), and elongation (EL) were observed respectively. BC nanofibers exist in the form of a sheet that was then varied in matrix PO. The BC sheet was mounted by one, three, five and seven pieces respectively in the matrix PO. The tensile strength of the composites was conducted by using the tensile equipment. The results showed that the tensile strength of the composite with a single sheet of BC was lower than that of pure PO. The ST value achieved maximum level in the number of layers of BC three pieces, but then it decreased for the composites reinforced five and seven pieces of BC nanofiber, respectively. Scanning Electron Microscope (SEM) observation exhibits bad interface bonding between BC nanofibers and PO matrix.

  11. The research of far infrared flame retardant polyester staple fiber

    Science.gov (United States)

    Li, Qingshan; Zhang, Kaijun; Luo, Jinqong; Li, Ji’an; Jiang, Jian; Liang, Qianqian; Jin, Yongxia; Liu, Bing

    2017-01-01

    Far infrared flame retardant slices was prepared, fiber with far infrared flame retardant composite function was also prepared by the method of melt spinning. Scanning electron microscopy (SEM) was used to observe the fibrous microscopic structure. In the SEM images, functional ultrafine powder particle size and distribution in the fiber were visible. The results show that the functional ultrafine powder is evenly distributed on the fibrous surface, which is closely combined with fiber, and the far infrared emissivity is F, which is more than (8 to 14 microns) 0.88. Far infrared flame retardant polyester fiber has not only good flame retardant, but also environmental health effect: releasing negative ions and launch far-infrared, which shows wide application prospect. The fiber was processed into far-infrared flame retardant electric blanket, whose functional indicators and flame retardant properties are not reduced.

  12. The Plant Polyester Cutin: Biosynthesis, Structure, and Biological Roles.

    Science.gov (United States)

    Fich, Eric A; Segerson, Nicholas A; Rose, Jocelyn K C

    2016-04-29

    Cutin, a polyester composed mostly of oxygenated fatty acids, serves as the framework of the plant cuticle. The same types of cutin monomers occur across most plant lineages, although some evolutionary trends are evident. Additionally, cutins from some species have monomer profiles that are characteristic of the related polymer suberin. Compositional differences likely have profound structural consequences, but little is known about cutin's molecular organization and architectural heterogeneity. Its biological importance is suggested by the wide variety of associated mutants and gene-silencing lines that show a disruption of cuticular integrity, giving rise to numerous physiological and developmental abnormalities. Mapping and characterization of these mutants, along with suppression of gene paralogs through RNA interference, have revealed much of the biosynthetic pathway and several regulatory factors; however, the mechanisms of cutin polymerization and its interactions with other cuticle and cell wall components are only now beginning to be resolved.

  13. Polyester Sulphonic Acid Interstitial Nanocomposite Platform for Peroxide Biosensor

    Directory of Open Access Journals (Sweden)

    Emmanuel I. Iwuoha

    2009-12-01

    Full Text Available A novel enzyme immobilization platform was prepared on a platinum disk working electrode by polymerizing aniline inside the interstitial pores of polyester sulphonic acid sodium salt (PESA. Scanning electron microscopy study showed the formation of homogeneous sulphonated polyaniline (PANI nanotubes (~90 nm and thermogravimetric analysis (TGA confirmed that the nanotubes were stable up to 230 °C. The PANI:PESA nanocomposite showed a quasi-reversible redox behaviour in phosphate buffer saline. Horseradish peroxidase (HRP was immobilized on to this modified electrode for hydrogen peroxide detection. The biosensor gave a sensitivity of 1.33 μA (μM-1 and a detection limit of 0.185 μM for H2O2. Stability experiments showed that the biosensor retained more than 64% of its initial sensitivity over four days of storage at 4 °C.

  14. Glass fibres reinforced polyester composites degradation monitoring by surface analysis

    Science.gov (United States)

    Croitoru, Catalin; Patachia, Silvia; Papancea, Adina; Baltes, Liana; Tierean, Mircea

    2015-12-01

    The paper presents a novel method for quantification of the modifications that occur on the surface of different types of gel-coated glass fibre-reinforced polyester composites under artificial UV-ageing at 254 nm. The method implies the adsorption of an ionic dye, namely methylene blue, on the UV-aged composite, and computing the CIELab colour space parameters from the photographic image of the coloured composite's surface. The method significantly enhances the colour differences between the irradiated composites and the reference, in contrast with the non-coloured ones. The colour modifications that occur represent a good indicative of the surface degradation, alteration of surface hydrophily and roughness of the composite and are in good correlation with the ATR-FTIR spectroscopy and optical microscopy results. The proposed method is easier, faster and cheaper than the traditional ones.

  15. Application of polyester derived from biomass in petroleum asphalt cement

    Directory of Open Access Journals (Sweden)

    Fernando de Araújo

    Full Text Available Abstract This study evaluated the effects of the incorporation of a new additive to asphalt cement oil (CAP. A polyol product was obtained through the oxypropylation reaction of sugarcane bagasse. This polyol was polymerised with pyromellitic anhydride in order to obtain a polyester (BCP to test its suitability in terms of the material properties to be applied as additives. FTIR spectra of the polymerised material (BCP confirmed the occurrence of chemical modification due to the appearance of a new band at 1750 cm-1, characteristic of ester groups. The TGA data showed that the BCP product had higher thermal stability than the polyol. According to the softening point and elastic recovery tests, the incorporation of 11% and 16% w/w BCP in conventional CAP met the specifications of regulatory standards.

  16. Simulation of Continuous Esterification Process of Polyester Polyols

    Institute of Scientific and Technical Information of China (English)

    CHEN Like; XI Zhenhao; QIN Zhen; ZHAO Ling; YUAN Weikang

    2013-01-01

    Based on the kinetic and thermodynamic equations,a comprehensive mathematical model for the continuous esterification process of polyester polyols was developed,which was carried out in an innovational bubbling reactive distillation tower (BRDT) at atmospheric pressure.In this new type of reactor,direct esterification between ethylene glycol and adipic acid was accomplished efficiently and rapidly.A bench BRDT with the height of 2 m was applied for the esterification process of poly (ethylene adipate) (PEA).In the continuous operation,linear oligomers were discharged from the bottom of the column,while water passed a few column trays and a packing section as a condensation byproduct.The influence of major operating conditions on reactor performance was also simulated.Simulation results were in good agreement with experimental data,providing a strategy for developing and optimizing this process.

  17. Polypropylene Fibers as Reinforcements of Polyester-Based Composites

    Directory of Open Access Journals (Sweden)

    Gonzalo Martínez-Barrera

    2013-01-01

    Full Text Available Effects of gamma radiation and the polypropylene fibers on compressive properties of polymer concrete composites (PC were studied. The PCs had a composition of 30 wt% of unsaturated polyester resin and 70 wt% of marble particles which have three different sizes (small, medium, and large. The PCs were submitted to 200, 250, and 300 kGy of radiation doses. The results show that the compressive properties depend on the combination of the polypropylene fiber concentration and the applied radiation dose. The compressive strength value is highest when using medium particle size, 0.1 vol% of polypropylene fibers and 250 kGy of dose; moreover, the compressive modulus decreases when increasing the particle size.

  18. Synthesis of functionalized CNTs/hyperbranched polyester nanocomposites

    Science.gov (United States)

    Pan, Yufeng; Cui, Xiaokun; Zhang, Yue

    2017-01-01

    Carbon nanotubes (CNTs) were unzipped using the modified Hummer method to prepare the CNTs-GO microstructure (see Fig. 1). A new type of CNTs-GO-H20 nanocomposite has been synthesized by grafting hyperbranched (HB) polyester (Boltorn H20) brushes on the CNTs-GO by coupling agent (KH560). The morphology of CNTs-GO-H20 was characterized by FTIR, TEM, XPS and TGA. The FT-IR data and XPS data evidenced that CNTs-GO-H20 nanocomposites were synthesized successfully. The addition of CNTs improved the thermal stability of the nanocomposites. The TEM data showed that the CNTs-GO microstructure was also prepared. These electrochemical measurements results indicated that coatings provided greater protection against corrosion behavior. Moreover, the nanocomposite material improved corrosion resistance of the coating.

  19. Properties of Surface Cyclic Oligomers Present on Polyester Fiber

    Institute of Scientific and Technical Information of China (English)

    郑敏; 宋心远

    2003-01-01

    The effects of different treatments, such as dry heat,wet heat, solvent vapor and ultrasonic, on properties of the cyclic oligomers on the surface of polyester fiber are studied. The components of surface oligomers are analyzed through Thin-Layer Chromatograph. The result shows that: all of the treatments, especially solvent vapor treatment, can significantly increase the content of surface cyclic oligomers. The content of cyclic trimer is increased more considerably than other oligomers. Moreover, the morphology and the distribution of surface cyclic oligomers are also different from different treatments: Dry heat and wet heat cause larger polygonal solids distributed evenly on the surface of fiber; solvent vapor makes fiber surface exhibit irregular rodlike crystal shapes randomly; ultrasonic treatment induces some obscure and smaller deposits on the surface of fiber.

  20. Polyester-based thin films with high photosensitivity

    Energy Technology Data Exchange (ETDEWEB)

    POTTER,KELLY SIMMONS; POTTER JR.,BARRETT G.; WHEELER,DAVID R.; JAMISON,GREGORY M.

    2000-02-29

    A great deal of research has been done to understand the photosensitive optical response of inorganic glasses, which exhibit a permanent, photo-induced refractive index change due to the presence of optically active point defects in the glass structure. In the present work, the authors have performed a preliminary study of the intrinsic photosensitivity of a polyester containing a cinnamylindene malonate group (CPE, a photo- and thermal-crosslinkable group) for use in photonic waveguide devices. Thin films of CPE (approximately 0.5 microns thick) were spun onto fused silica substrates. Optical absorption in the thin films was evaluated both before and after exposure to UV radiation sources. It was found that the polyester exhibits two dominant UV absorption bands centered about 240 nm and 330 nm. Under exposure to 337 nm radiation (nitrogen laser) a marked bleaching of the 330 nm band was observed. This band bleaching is a direct result of the photo-induced crosslinking in the cinnamylindene malonate group. Exposure to 248 nm radiation (excimer laser), conversely, resulted in similar bleaching of the 330 nm band but was accompanied by nearly complete bleaching of the higher energy 240 nm band. Based on a Kramers-Kronig analysis of the absorption changes, refractive index changes on the order of {minus}10{sup {minus}2} are estimated. Confirmation of this calculation has been provided via ellipsometry which estimates a refractive index change at 632 nm of {minus}0.061 {+-} 0.002. Thus, the results of this investigation confirm the photosensitive potential of this type of material.

  1. Preparation of TiO2 Coated on Fabrics and Their Photocatalytic Reactivity

    Institute of Scientific and Technical Information of China (English)

    XU Yang; WEI Qu-fu; WANG Ying-ying; HUANG Feng-lin; ZHU He

    2007-01-01

    Nanoseale titanium dioxide functional films were prepared on the surface of the cotton woven fabric and the polyester knitted fabric at room temperature by Radio Frequency (RF) magnetron sputtering process. The surface microstructure and morphology were characterized by scanning electron microscope (SEM) and X-ray diffraction (XRD). Photocatalytic property of two treated fabrics was tested in solar and ultraviolet (UV) radiation respectively, and their photocatalytic activity was compared. The results showed that the nanoscale titanium dioxide deposited on the surface of the treated fabrics was at different anastasia phase. The treated fabrics have excellent photocatalytic property, and after 30 launderings, the photocatalytic activity still maintained at a high level. Also, it indicated that the photocatalytic activity of the treated fabrics in UV radiation was higher than in solar radiation, but the effect wasn't very distinct. And at the same experimental magnetron sputtering parameters, the cotton coated with the nanoscale titanium dioxide showed better performance than the polyester fabric coated with the nanoscale titanium dioxide in terms of the photocatalytic property.

  2. Polyester-based (bio)degradable polymers as environmentally friendly materials for sustainable development.

    Science.gov (United States)

    Rydz, Joanna; Sikorska, Wanda; Kyulavska, Mariya; Christova, Darinka

    2014-12-29

    This review focuses on the polyesters such as polylactide and polyhydroxyalkonoates, as well as polyamides produced from renewable resources, which are currently among the most promising (bio)degradable polymers. Synthetic pathways, favourable properties and utilisation (most important applications) of these attractive polymer families are outlined. Environmental impact and in particular (bio)degradation of aliphatic polyesters, polyamides and related copolymer structures are described in view of the potential applications in various fields.

  3. The identification of cutin synthase: formation of the plant polyester cutin

    DEFF Research Database (Denmark)

    Yeats, Trevor H.; Martin, Laetitia B. B.; Viart, Helene Marie-France;

    2012-01-01

    A hydrophobic cuticle consisting of waxes and the polyester cutin covers the aerial epidermis of all land plants, providing essential protection from desiccation and other stresses. We have determined the enzymatic basis of cutin polymerization through characterization of a tomato extracellular...... acyltransferase, CD1, and its substrate, 2-mono(10,16-dihydroxyhexadecanoyl)glycerol. CD1 has in vitro polyester synthesis activity and is required for cutin accumulation in vivo, indicating that it is a cutin synthase....

  4. The identification of cutin synthase: formation of the plant polyester cutin.

    Science.gov (United States)

    Yeats, Trevor H; Martin, Laetitia B B; Viart, Hélène M-F; Isaacson, Tal; He, Yonghua; Zhao, Lingxia; Matas, Antonio J; Buda, Gregory J; Domozych, David S; Clausen, Mads H; Rose, Jocelyn K C

    2012-07-01

    A hydrophobic cuticle consisting of waxes and the polyester cutin covers the aerial epidermis of all land plants, providing essential protection from desiccation and other stresses. We have determined the enzymatic basis of cutin polymerization through characterization of a tomato extracellular acyltransferase, CD1, and its substrate, 2-mono(10,16-dihydroxyhexadecanoyl)glycerol. CD1 has in vitro polyester synthesis activity and is required for cutin accumulation in vivo, indicating that it is a cutin synthase.

  5. The identification of cutin synthase: formation of the plant polyester cutin

    OpenAIRE

    Yeats, Trevor H.; Martin, Laetitia B. B.; Viart, Hélène M.-F.; Isaacson, Tal; He, Yonghua; Zhao, Lingxia; Matas, Antonio J.; Buda, Gregory J.; Domozych, David S.; Clausen, Mads H.; Rose, Jocelyn K. C.

    2012-01-01

    A hydrophobic cuticle consisting of waxes and the polyester cutin covers the aerial epidermis of all land plants, providing essential protection from desiccation and other stresses. We have determined the enzymatic basis of cutin polymerization through characterization of a tomato extracellular acyltransferase, CD1, and its substrate, 2-mono(10,16-dihydroxyhexadecanoyl)glycerol (2-MHG). CD1 has in vitro polyester synthesis activity and is required for cutin accumulation in vivo, indicating th...

  6. Influence of the substituent on azobenzene side-chain polyester optical storage materials

    DEFF Research Database (Denmark)

    Pedersen, M; Hvilsted, Søren; Holme, NCR;

    1999-01-01

    , chloro, and bromo. C-13 NMR spectroscopic and molecular mass investigations substantiate good film forming characteristics. The optical storage performance of thin polyester films are investigated through polarization holography. The resulting diffraction efficiency is mapped and discussed as a function...... of irradiation power and exposure time. Polytetradecanedioates with cyano-, nitro-, methyl-, fluoro-, or trinuoromethyl-azobenzene reach more than 50% diffraction efficiency. Investigations of anisotropy induced at different temperatures reveal that the polyesters are only photosensitive in a narrow temperature...

  7. Polyester-Based (Biodegradable Polymers as Environmentally Friendly Materials for Sustainable Development

    Directory of Open Access Journals (Sweden)

    Joanna Rydz

    2014-12-01

    Full Text Available This review focuses on the polyesters such as polylactide and polyhydroxyalkonoates, as well as polyamides produced from renewable resources, which are currently among the most promising (biodegradable polymers. Synthetic pathways, favourable properties and utilisation (most important applications of these attractive polymer families are outlined. Environmental impact and in particular (biodegradation of aliphatic polyesters, polyamides and related copolymer structures are described in view of the potential applications in various fields.

  8. Data from: Dispenser printed capacitive proximity sensor on fabric for applications in the creative industries

    OpenAIRE

    2016-01-01

    This paper reports a planar capacitive proximity sensor fully dispenser printed on a standard polyester woven fabric using conductive ink. Dispenser printing is a new digital printing technique offering the advantages of complete geometric design flexibility and the ability to direct write multilayer devices without requiring bespoke tooling. A dispenser printer is also capable of printing a wide range of ink viscosities encompassing those of inkjet and screen printable inks. Previous researc...

  9. Dispenser printed capacitive proximity sensor on fabric for applications in the creative industries

    OpenAIRE

    2016-01-01

    This paper reports a planar capacitive proximity sensor fully dispenser printed on a standard polyester woven fabric using conductive ink. Dispenser printing is a new digital printing technique offering the advantages of complete geometric design flexibility and the ability to direct write multilayer devices without requiring bespoke tooling. A dispenser printer is also capable of printing a wide range of ink viscosities encompassing those of inkjet and screen printable inks. Previous researc...

  10. Study on Wearability of Silk Wool Blended Serge Fabric%丝毛哔叽的服用性能研究

    Institute of Scientific and Technical Information of China (English)

    化文培; 刘俊雄

    2011-01-01

    文章对丝毛混纺哔叽织物的服用性能进行了测试,结果表明:蚕丝和羊毛混纺哔叽织物的透气性、悬垂性优于毛涤混纺织物,呢面光泽优于同规格毛涤产品;抗起毛起球性能较好。总之,丝毛哔叽织物的服用性能比全毛和毛涤混纺织物有一定的优势。%The wearability of silk/wool blended serge fabric was tested.The results show that,the permeability and drape of silk/wool blended serge fabric are better than those of wool/polyester blended fabric.The surface gloss is also better than the same specification of wool/polyester blended fabric and the anti-pilling tendenay is good.Generally speaking,silk/wool serge fabric has some advantages compared with wool fabric and wool-polyester blended fabric.

  11. Phase diagrams in blends of poly(3-hydroxybutyric acid with various aliphatic polyesters

    Directory of Open Access Journals (Sweden)

    2011-07-01

    Full Text Available Phase behavior with immiscibility, miscibility, crystalline morphology, and kinetic analysis in blends of poly(3-hydroxybutyric acid (PHB with aliphatic polyesters such as poly(butylene adipate (PBA, poly(ethylene adipate (PEA, poly(trimethylene adipate (PTA, or poly(ethylene succinate (PESu, respectively, were explored mainly using differential scanning calorimeter (DSC and polarized-light optical microscopy (POM. Immiscibility phase behavior with reversible upper-critical-solution-temperature (UCST is common in the PHB/polyester blends. The polyester/polyester blend of PHB/PTA is partially miscible with no UCST in melt and amorphous glassy states within a composition range of PTA less than 50 wt%. The miscible crystalline/crystalline blend exhibits ring-banded spherulites at Tc = 50~100°C, with inter-ring spacing dependent on Tc. All immiscible or partially miscible PHB/polyester blends, by contrast, exhibit disrupted ringbanded spherulites or discrete spherical phase domains upon cooling from UCST to crystallization. The blends of PHB with all other aliphatic polyesters, such as PESu, PEA, PBA, etc. are only partially miscible or immiscible with an upper critical solution temperature (UCST at 180~221°C depending on blend composition. UCST with reversibility was verified.

  12. Simultaneous determination of brominated and phosphate flame retardants in flame-retarded polyester curtains by a novel extraction method.

    Science.gov (United States)

    Miyake, Yuichi; Tokumura, Masahiro; Nakayama, Hayato; Wang, Qi; Amagai, Takashi; Ogo, Sayaka; Kume, Kazunari; Kobayashi, Takeshi; Takasu, Shinji; Ogawa, Kumiko; Kannan, Kurunthachalam

    2017-12-01

    The use of novel brominated flame retardants (BFRs) and phosphate-based flame retardants (PFRs) has increased as substitutes for hexabromocyclododecane (HBCD) in many consumer products. To facilitate collection of data on chemicals used as flame retardants in textiles and fabrics, we developed an analytical method using liquid chromatography interfaced with tandem mass spectrometry (LC-MS/MS). We compared two extraction methods, one involving ultrasonic extraction (traditional method) using dichloromethane, toluene or acetone and the other encompassing complete dissolution of textile with 25% 1,1,1,3,3,3-hexafluoro-2-propanol/chloroform. The dissolution method extracted up to 204 times more BFRs and PFRs than the traditional ultrasonic extraction. Tris(2,3-dibromopropyl) isocyanurate (TDBP-TAZTO), triphenylphosphine oxide (TPhPO), tris(1,3-dichloro-2-propyl) phosphate (TDCPP), tricresyl phosphate (TCsP), and triphenyl phosphate (TPhP) were found in 40 flame-retarded curtain samples purchased from Japanese market in 2014. TDBP-TAZTO was detected in polyester curtains for the first time. Some of the flame-retarded curtain samples did not contain any of the known target analytes, which suggested the presence of other unknown flame retardants in those fabrics. Copyright © 2017. Published by Elsevier B.V.

  13. Effect of functionalized metal oxides addition on the mechanical, thermal and swelling behaviour of polyester/jute composites

    Directory of Open Access Journals (Sweden)

    Jaideep Adhikari

    2017-04-01

    Full Text Available The unsaturated polyester composites were fabricated in hand lay-up method by reinforcing with jute fibre along with alumina or zirconia particles in different filler loading viz. 5, 10, 15 and 20 wt%. It was observed that with incorporation of fillers, the microhardness value of the resulting composites increases and reaches its maximum at 20 wt% filler content. Characterizations were performed on the composites fabricated with overall 20 wt% filler content (18 wt% fibre and 2 wt% metal oxide particles. Various characterizations like Vicker’s microhardness testing, scanning electron microscopy (SEM, Energy-dispersive X-ray spectroscopy (EDS, X-ray Diffraction (XRD, Fourier transform infrared (FTIR spectroscopy, thermogravimetric (TG analysis, differential scanning calorimetry (DSC, limiting oxygen index (LOI testing and water absorption test were performed. Tensile, Flexural testing were also performed on the normal and water absorbed samples. SEM analysis ensured good dispersion of filler within the polymer matrix. EDS and XRD were performed to identify the filler in the composites. FITR spectroscopy revealed the bonding of fillers with the matrix. TG analysis showed that thermal stability, degradation temperature of jute-ZrO2 composites were best over the others. LOI testing also shows similar trend, showing better fire resistant property of jute-ZrO2 composites than the Al2O3 dispersed. Water absorption test indicates the stability of different composite in various atmospheres (normal, boiling, simulated marine, alkali and acid water.

  14. Innovative Self-Cleaning and Biocompatible Polyester Textiles Nano-Decorated with Fe–N-Doped Titanium Dioxide

    Science.gov (United States)

    Nica, Ionela Cristina; Stan, Miruna Silvia; Dinischiotu, Anca; Popa, Marcela; Chifiriuc, Mariana Carmen; Lazar, Veronica; Pircalabioru, Gratiela G.; Bezirtzoglou, Eugenia; Iordache, Ovidiu G.; Varzaru, Elena; Dumitrescu, Iuliana; Feder, Marcel; Vasiliu, Florin; Mercioniu, Ionel; Diamandescu, Lucian

    2016-01-01

    The development of innovative technologies to modify natural textiles holds an important impact for medical applications, including the prevention of contamination with microorganisms, particularly in the hospital environment. In our study, Fe and N co-doped TiO2 nanoparticles have been obtained via the hydrothermal route, at moderate temperature, followed by short thermal annealing at 400 °C. These particles were used to impregnate polyester (PES) materials which have been evaluated for their morphology, photocatalytic performance, antimicrobial activity against bacterial reference strains, and in vitro biocompatibility on human skin fibroblasts. Microscopic examination and quantitative assays have been used to evaluate the cellular morphology and viability, cell membrane integrity, and inflammatory response. All treated PES materials specifically inhibited the growth of Gram-negative bacilli strains after 15 min of contact, being particularly active against Pseudomonas aeruginosa. PES fabrics treated with photocatalysts did not affect cell membrane integrity nor induce inflammatory processes, proving good biocompatibility. These results demonstrate that the treatment of PES materials with TiO2-1% Fe–N particles could provide novel biocompatible fabrics with short term protection against microbial colonization, demonstrating their potential for the development of innovative textiles that could be used in biomedical applications for preventing patients’ accidental contamination with microorganisms from the hospital environment. PMID:28335342

  15. Preparation and Photocatalytic Activity of TiO-Deposited Fabrics

    Directory of Open Access Journals (Sweden)

    Yang Xu

    2012-01-01

    Full Text Available Nanoscale titanium dioxide (TiO2 photocatalytic films were deposited on the surface of polyester nonwovens by using direct current reactive magnetron sputtering. The effects of coating thickness on the surface structures and properties of TiO2-coated fabrics were investigated by X-ray photoelectron spectroscopy (XPS, atomic force microscope (AFM, and scanning electron microscope (SEM. The photocatalytic activity of the functional nonwoven fabrics was evaluated by the degradation of methylene blue. The test results proved that the grain sizes of the sputtered clusters increased and the coating layer became more compact with the increase of film thickness, but the composition of the sputtered films did not have any significant change. At the same time, the photocatalytic activity of TiO2-coated fabrics mostly depended on the film thickness which could lead to the optimum thickness for a particular application.

  16. Synthesis, Properties and Applications of Biodegradable Polymers Derived from Diols and Dicarboxylic Acids: From Polyesters to Poly(ester amides

    Directory of Open Access Journals (Sweden)

    Angélica Díaz

    2014-04-01

    Full Text Available Poly(alkylene dicarboxylates constitute a family of biodegradable polymers with increasing interest for both commodity and speciality applications. Most of these polymers can be prepared from biobased diols and dicarboxylic acids such as 1,4-butanediol, succinic acid and carbohydrates. This review provides a current status report concerning synthesis, biodegradation and applications of a series of polymers that cover a wide range of properties, namely, materials from elastomeric to rigid characteristics that are suitable for applications such as hydrogels, soft tissue engineering, drug delivery systems and liquid crystals. Finally, the incorporation of aromatic units and α-amino acids is considered since stiffness of molecular chains and intermolecular interactions can be drastically changed. In fact, poly(ester amides derived from naturally occurring amino acids offer great possibilities as biodegradable materials for biomedical applications which are also extensively discussed.

  17. Antimicrobial hyperbranched poly(ester amide)/polyaniline nanofiber modified montmorillonite nanocomposites.

    Science.gov (United States)

    Pramanik, Sujata; Bharali, Pranjal; Konwar, B K; Karak, Niranjan

    2014-02-01

    There has been growing interest in the use of nanomaterials featuring potent of antimicrobial activity in the biomedical domain. It still remains a challenge for the researchers to develop an efficient nanocomposite possessing antimicrobial efficacy against broad spectrum microbes including bacteria, fungi as well as algal consortium, posing serious challenges for the human survival. In addressing the above problem, we report the fabrication of bio-based hyperbranched poly(ester amide) (HBPEA)/polyaniline nanofiber modified montmorillonite (MMT) nanocomposites by an ex-situ polymerization technique at varied weight percentages (1, 2.5, 5 wt.%) of the modified MMT (nanohybrid). The Fourier transform infrared spectroscopy confirmed the structural changes upon interaction of the nanohybrid with HBPEA. A probable mechanism is proposed for the formation of nanocomposites with partially exfoliated nanoplatelet structure, which was further confirmed from the high resolution transmission electron microscopic analyses. The prepared nanocomposites exhibited potent efficacy against gram positive bacteria like Bacillus subtilis and Staphylococcus aureus as compared to the gram negative ones like Pseudomonas aeruginosa and Escherichia coli. The nanocomposites showed significant antifungal activity against Aspergillus niger, Fusarium oxysporum and Coleotricum capcii and antialgal activity against algal consortium comprising of Chlorella, Hormidium and Cladophorella species. The formation of thermosetting nanocomposites resulted in the acceptable improvement of desired physico-chemical and mechanical properties including thermostability. Thus pronounced antimicrobial activity of the nanocomposites against a spectrum of bacterial and fungal strains as well as a consortium of algal species along with other desired performance vouched them as potent antimicrobial materials in the realm of health and biomedical industry.

  18. Unsaturated polyester/expanded polystyrene composite : thermal characteristics and flame retardancy effects

    Science.gov (United States)

    Mohamed, R.; Syed Mustafa, S. A.; Norizan, Mohd N.; Amerudin, L. S.

    2017-07-01

    Panels for energy efficient buildings has to meet certain requirements such as low thermal conductivity and inherent flame retardancy characteristics, before being eligible for buildings and construction applications. Expanded Polystyrene (EPS) as waste material had been incorporated as filler in Unsaturated Polyester Resin (UPR) composites. The composite are fabricated as flat panel window or glazing to replace glass. In this study, different EPS content incorporated was found to affect flammability and thermal characteristics. Core additives such as Flame Retardant (FR) and Antioxidant (AO) were added to the composite for imparting flame retardancy and prevent aging of the composite. The result obtained via the comparison of the various composite systems studied had revealed that organic and metal oxide flame retardant (FR) additives imparts higher flame retardancy levels than others, but each type of additives had interacted with the polymeric matrixes differently. The thermal conductivity, k value, as measured from a handheld thermal probe had showed a minimum of ~0.124 W/m.K for the 1%wt zinc oxide sample, while the highest k value of ~0.280 W/m.K was exhibited by the 2%wt tin oxide sample. The first 1%wt of either metal oxide FR initially decreases both the thermal conductivity, k value; and volumetric specific heat, Cp,v of the samples. At 2%wt, increases in k value were obtained. The flammability was reduced with the use of organic Phosphate Ester FR, which had reduced the flame speed to about 37.1% of the original flame speed. With the equivalent mixture of all three organic FR system, the flammability reduced less than 30%, while the metal oxide FR additive doesn't reduces the flammability.

  19. Dielectric Response and Broadband Microwave Absorption Properties of Three-Layer Graded ZnO Nanowhisker/Polyester Composites

    Institute of Scientific and Technical Information of China (English)

    ZHOU Yan; SHI Xiao-Ling; YUAN Jie; FANG Xiao-Yong; CAO Mao-Sheng

    2007-01-01

    We design and prepare three-layer graded ZnO nanowhisker/polyester composites. The dispersion configuration of ZnO nanowhiskers in the polyester is investigated, and their microwave reflectivity curves are also measured. Experimental results have shown that the graded dispersion with ZnO nanowhiskers contributes to broadband microwave absorption. In other words, the absorption band depends on the graded dispersion configuration of ZnO nanowhiskers in polyester matrix.

  20. Effect of fiber loading on the mechanical and physical properties of “green” bagasse–polyester composite

    OpenAIRE

    2015-01-01

    The main aim of this work is to fill unsaturated polyester resin with bagasse agricultural waste, as reinforcement, to prepare green wooden–polymer composites. Bagasse fibers were treated with 5% sodium hydroxide and then with dilute sulfuric acid. Bagasse–polyester composites were prepared by addition of 5, 10 and 15% of untreated and alkali treated bagasse fibers to polyester. The crosslinking reaction was performed using methyl ethyl ketone peroxide as a catalyst and cobalt octoate as an a...

  1. 聚吡咯/涤纶导电复合织物的制备及性能%Preparation of polypyrrole/polyester conductive composites and their properties

    Institute of Scientific and Technical Information of China (English)

    白林翠; 沈勇; 张惠芳; 王黎明

    2012-01-01

    Polypyrrole/polyester conductive composites are prepared by in-situ oxidative polymerization with FeCI3 as an oxidant and polyester as a matrix. Influences of dosages of oxidant, pyrrole and dopant, reaction temperature and time on conductivity are discussed, and the morphologies of the conductive composites are characterized by SEM. The results show that conductive fabric with good property can be prepared under controlled reaction conditions.%以涤纶织物为基底材料,FeCl3为氧化剂,通过原位聚合吸附法制备聚吡咯/涤纶导电复合织物.探讨了氧化剂浓度、吡咯单体浓度、掺杂剂用量、反应温度和反应时间等各因素对织物导电性的影响,并通过SEM观察导电聚合物织物的表面微观形貌.结果表明,通过控制反应条件,可以制备性能良好的导电高聚物织物.

  2. Influence of CaCO3, Al2O3, and TiO2 microfillers on physico-mechanical properties of Luffa cylindrica/polyester composites

    Directory of Open Access Journals (Sweden)

    Vinay Kumar Patel

    2016-06-01

    Full Text Available The development of natural fibre reinforced polymer composites has gained popularity in many applications due to their environment friendly characteristics over the synthetic fibre based polymer composites. This paper describes the fabrication and physical, mechanical, three-body abrasive wear and water absorption behaviour of Luffa fibre reinforced polyester composites with and without addition of micro-fillers of Al2O3, CaCO3 and TiO2. The ranking of the composite materials has been made by using Technique for order preference by similarity to ideal solution (TOPSIS method with output parameters of their physical, mechanical and abrasive wear and water absorption attributes. The addition of microfillers has enhanced greatly the physical and mechanical properties of Luffa-fibre based composites. The addition of microfillers has influenced the physico-mechanical properties of Luffa-fibre based polyester composites in descending order of CaCO3, Al2O3, and TiO2.

  3. Aliphatic polyester block polymers: renewable, degradable, and sustainable.

    Science.gov (United States)

    Hillmyer, Marc A; Tolman, William B

    2014-08-19

    Nearly all polymers are derived from nonrenewable fossil resources, and their disposal at their end of use presents significant environmental problems. Nonetheless, polymers are ubiquitous, key components in myriad technologies and are simply indispensible for modern society. An important overarching goal in contemporary polymer research is to develop sustainable alternatives to "petro-polymers" that have competitive performance properties and price, are derived from renewable resources, and may be easily and safely recycled or degraded. Aliphatic polyesters are particularly attractive targets that may be prepared in highly controlled fashion by ring-opening polymerization of bioderived lactones. However, property profiles of polyesters derived from single monomers (homopolymers) can limit their applications, thus demanding alternative strategies. One such strategy is to link distinct polymeric segments in an A-B-A fashion, with A and B chosen to be thermodynamically incompatible so that they can self-organize on a nanometer-length scale and adopt morphologies that endow them with tunable properties. For example, such triblock copolymers can be useful as thermoplastic elastomers, in pressure sensitive adhesive formulations, and as toughening modifiers. Inspired by the tremendous utility of petroleum-derived styrenic triblock copolymers, we aimed to develop syntheses and understand the structure-property profiles of sustainable alternatives, focusing on all renewable and all readily degradable aliphatic polyester triblocks as targets. Building upon oxidation chemistry reported more than a century ago, a constituent of the peppermint plant, (-)-menthol, was converted to the ε-caprolactone derivative menthide. Using a diol initiator and controlled catalysis, menthide was polymerized to yield a low glass transition temperature telechelic polymer (PM) that was then further functionalized using the biomass-derived monomer lactide (LA) to yield fully renewable PLA

  4. Feasibility Assessments of the Use of Recycled Fibers in Nonwoven Fabrics

    Directory of Open Access Journals (Sweden)

    Jia-Horng Lin

    2017-01-01

    Full Text Available Environmental protection has become an increasing concern, which makes recycling and reclaiming highly important. In addition to governmental campaigns and promotion, enterprises should examine each perspective thoroughly in order to prevent excessive resource consumption. In this study, recycled materials, including recycled far-infrared polyester (FPET fiber, three-dimensional crimped hollow flame-retarding (TPET fiber, and low-melting-point polyester (LPET fiber, are used to form nonwoven fabrics. The influence of different amounts of FPET fiber, 0–80 wt %, on the properties of nonwoven fabrics was examined. The sheath of LPET fibers can be melted as a result of hot pressing, which provides cohesion between fibers that mechanically improves the nonwoven fabrics. The tensile strength, tearing strength, air permeability, and far infrared (FIR emissivity of the nonwoven fabrics were examined, thereby determining the optimal parameters. The test results show that the thermally treated nonwoven fabrics have better mechanical properties and FIR emissivity, compared to those of non-thermally treated nonwoven fabrics. Moreover, more FPET fibers cause the mechanical properties along the cross machine direction (CD to decrease by 9% and that along the machine direction (MD to decrease by 5%. In particular, all the thermally treated samples exhibit a FIR emissivity of 0.8, which is health-promoting.

  5. Bioengineering of bacteria to assemble custom-made polyester affinity resins.

    Science.gov (United States)

    Hay, Iain D; Du, Jinping; Burr, Natalie; Rehm, Bernd H A

    2015-01-01

    Proof of concept for the in vivo bacterial production of a polyester resin displaying various customizable affinity protein binding domains is provided. This was achieved by engineering various protein binding domains into a bacterial polyester-synthesizing enzyme. Affinity binding domains based on various structural folds and derived from molecular libraries were used to demonstrate the potential of this technique. Designed ankyrin repeat proteins (DARPins), engineered OB-fold domains (OBodies), and VHH domains from camelid antibodies (nanobodies) were employed. The respective resins were produced in a single bacterial fermentation step, and a simple purification protocol was developed. Purified resins were suitable for most lab-scale affinity chromatography purposes. All of the affinity domains tested produced polyester beads with specific affinity for the target protein. The binding capacity of these affinity resins ranged from 90 to 600 nmol of protein per wet gram of polyester affinity resin, enabling purification of a recombinant protein target from a complex bacterial cell lysate up to a purity level of 96% in one step. The polyester resin was efficiently produced by conventional lab-scale shake flask fermentation, resulting in bacteria accumulating up to 55% of their cellular dry weight as polyester. A further proof of concept demonstrating the practicality of this technique was obtained through the intracellular coproduction of a specific affinity resin and its target. This enables in vivo binding and purification of the coproduced "target protein." Overall, this study provides evidence for the use of molecular engineering of polyester synthases toward the microbial production of specific bioseparation resins implementing previously selected binding domains.

  6. Fabrication Technology

    Energy Technology Data Exchange (ETDEWEB)

    Blaedel, K.L.

    1993-03-01

    The mission of the Fabrication Technology thrust area is to have an adequate base of manufacturing technology, not necessarily resident at Lawrence Livermore National Laboratory (LLNL), to conduct the future business of LLNL. The specific goals continue to be to (1) develop an understanding of fundamental fabrication processes; (2) construct general purpose process models that will have wide applicability; (3) document findings and models in journals; (4) transfer technology to LLNL programs, industry, and colleagues; and (5) develop continuing relationships with the industrial and academic communities to advance the collective understanding of fabrication processes. The strategy to ensure success is changing. For technologies in which they are expert and which will continue to be of future importance to LLNL, they can often attract outside resources both to maintain their expertise by applying it to a specific problem and to help fund further development. A popular vehicle to fund such work is the Cooperative Research and Development Agreement with industry. For technologies needing development because of their future critical importance and in which they are not expert, they use internal funding sources. These latter are the topics of the thrust area. Three FY-92 funded projects are discussed in this section. Each project clearly moves the Fabrication Technology thrust area towards the goals outlined above. They have also continued their membership in the North Carolina State University Precision Engineering Center, a multidisciplinary research and graduate program established to provide the new technologies needed by high-technology institutions in the US. As members, they have access to and use of the results of their research projects, many of which parallel the precision engineering efforts at LLNL.

  7. Fabrication Technology

    Energy Technology Data Exchange (ETDEWEB)

    Blaedel, K.L.

    1993-03-01

    The mission of the Fabrication Technology thrust area is to have an adequate base of manufacturing technology, not necessarily resident at Lawrence Livermore National Laboratory (LLNL), to conduct the future business of LLNL. The specific goals continue to be to (1) develop an understanding of fundamental fabrication processes; (2) construct general purpose process models that will have wide applicability; (3) document findings and models in journals; (4) transfer technology to LLNL programs, industry, and colleagues; and (5) develop continuing relationships with the industrial and academic communities to advance the collective understanding of fabrication processes. The strategy to ensure success is changing. For technologies in which they are expert and which will continue to be of future importance to LLNL, they can often attract outside resources both to maintain their expertise by applying it to a specific problem and to help fund further development. A popular vehicle to fund such work is the Cooperative Research and Development Agreement with industry. For technologies needing development because of their future critical importance and in which they are not expert, they use internal funding sources. These latter are the topics of the thrust area. Three FY-92 funded projects are discussed in this section. Each project clearly moves the Fabrication Technology thrust area towards the goals outlined above. They have also continued their membership in the North Carolina State University Precision Engineering Center, a multidisciplinary research and graduate program established to provide the new technologies needed by high-technology institutions in the US. As members, they have access to and use of the results of their research projects, many of which parallel the precision engineering efforts at LLNL.

  8. Recycling polyester from waste polyester-cotton blends%利用废弃涤棉混纺纤维回收涤纶

    Institute of Scientific and Technical Information of China (English)

    孔伟; 于永玲; 吕丽华

    2012-01-01

    The separation process of waste polyester-cotton fiber blends with dilute acid was studied to recycle polyester. The effect of hydrochloric acid concentration, reaction time, reaction temperature and solid-liquid ratio on the separation and recovery of polyester was studied through orthogonal experiment. The results showed that the impact factors order were: reaction time > mass fraction > reaction temperature > ratio of solid to liquid. The optimal conditions were: 10% of hydrochloric acid concentration, 40 g/L of liquid, 95 ℃ and 90 min. The polyester fibers were hydrolyzed into fibrous and cotton fiber were hydrolyzed into small powders after reaction so that the polyester was got.%对稀酸法分离废弃涤棉混纺纤维,回收涤纶的工艺过程进行了研究.采用正交试验考察了盐酸质量分数、反应时间、反应温度及固液比等因素对分离回收涤纶效果的影响.研究表明,影响因素的显著性大小依次为:反应时间、盐酸质量分数、反应温度、固液比.最优工艺为:盐酸质量分数10%,固液比40 g/L,温度95℃,反应时间90 min.反应后的涤纶成纤维状,棉纤维水解成细小粉末,通过过滤分离达到了回收涤纶的目的.

  9. Hydrolysis of synthetic polyesters by Clostridium botulinum esterases.

    Science.gov (United States)

    Perz, Veronika; Baumschlager, Armin; Bleymaier, Klaus; Zitzenbacher, Sabine; Hromic, Altijana; Steinkellner, Georg; Pairitsch, Andris; Łyskowski, Andrzej; Gruber, Karl; Sinkel, Carsten; Küper, Ulf; Ribitsch, Doris; Guebitz, Georg M

    2016-05-01

    Two novel esterases from the anaerobe Clostridium botulinum ATCC 3502 (Cbotu_EstA and Cbotu_EstB) were expressed in Escherichia coli BL21-Gold(DE3) and were found to hydrolyze the polyester poly(butylene adipate-co-butylene terephthalate) (PBAT). The active site residues (triad Ser, Asp, His) are present in both enzymes at the same location only with some amino acid variations near the active site at the surrounding of aspartate. Yet, Cbotu_EstA showed higher kcat values on para-nitrophenyl butyrate and para-nitrophenyl acetate and was considerably more active (sixfold) on PBAT. The entrance to the active site of the modeled Cbotu_EstB appears more narrowed compared to the crystal structure of Cbotu_EstA and the N-terminus is shorter which could explain its lower activity on PBAT. The Cbotu_EstA crystal structure consists of two regions that may act as movable cap domains and a zinc metal binding site.

  10. Optimizing the delamination failure in bamboo fiber reinforced polyester composite

    Directory of Open Access Journals (Sweden)

    N. Abilash

    2016-01-01

    Full Text Available Delamination is represented to be the most prevalent failure in composite structures. The use of composites in the manufacturing sector plays a very important role in the industry in general. Moreover these materials have unique characteristics when analyzed separately from constituents which are a part of them. In this paper, a partially ecological composite was made, using natural fibers as reinforcement (bamboo fiber, in the polyester resin matrix to form a composite, seeking to improve the mechanical behavior among its class of materials. The characteristics of a composite material are determined by how it behaves while machining, Drilling is the most predominant machining process because of its cost effectiveness when compared with other processes. Obviously delamination is the major problem that is focused by many researchers while selecting drilling as the machining process in polymeric composites. This research mainly emphasizes on the critical parameters by varying its speed, feed, and diameter of the cutting tool, their contribution to delamination was analyzed. Reduced delaminations were identified by varying the speed and feed rate.

  11. Fungal communities associated with degradation of polyester polyurethane in soil.

    Science.gov (United States)

    Cosgrove, Lee; McGeechan, Paula L; Robson, Geoff D; Handley, Pauline S

    2007-09-01

    Soil fungal communities involved in the biodegradation of polyester polyurethane (PU) were investigated. PU coupons were buried in two sandy loam soils with different levels of organic carbon: one was acidic (pH 5.5), and the other was more neutral (pH 6.7). After 5 months of burial, the fungal communities on the surface of the PU were compared with the native soil communities using culture-based and molecular techniques. Putative PU-degrading fungi were common in both soils, as soil, and only a few species in the PU communities were detectable in the soil, indicating that only a small subset of the soil fungal communities colonized the PU. Soil type influenced the composition of the PU fungal communities. Geomyces pannorum and a Phoma sp. were the dominant species recovered by culturing from the PU buried in the acidic and neutral soils, respectively. Both fungi degraded Impranil and represented >80% of cultivable colonies from each plastic. However, PU was highly susceptible to degradation in both soils, losing up to 95% of its tensile strength. Therefore, different fungi are associated with PU degradation in different soils but the physical process is independent of soil type.

  12. Identification and comparison of cutinases for synthetic polyester degradation.

    Science.gov (United States)

    Baker, Peter James; Poultney, Christopher; Liu, Zhiqiang; Gross, Richard; Montclare, Jin Kim

    2012-01-01

    Cutinases have been exploited for a broad range of reactions, from hydrolysis of soluble and insoluble esters to polymer synthesis. To further expand the biotechnological applications of cutinases for synthetic polyester degradation, we perform a comparative activity and stability analysis of five cutinases from Alternaria brassicicola (AbC), Aspergillus fumigatus (AfC), Aspergillus oryzae (AoC), Humicola insolens (HiC), and the well-characterized Fusarium solani (FsC). Of the cutinases, HiC demonstrated enhanced poly(ε-caprolactone) hydrolysis at high temperatures and under all pH values, followed by AoC and AfC. Both AbC and FsC are least stable and function poorly at high temperatures as well as at acidic pH conditions. Surface charge calculations and phylogenetic analysis reveal two important modes of cutinase stabilization: (1) an overall neutral surface charge within the "crowning area" by the active site and (2) additional disulfide bond formation. These studies provide insights useful for reengineering such enzymes with improved function and stability for a wide range of biotransformations.

  13. Enthalpy-Entropy Compensation in Polyester Degradation Reactions

    Directory of Open Access Journals (Sweden)

    Adam Al-Mulla

    2012-01-01

    Full Text Available In an earlier work the author had studied the degradation kinetics of polyethylene terephthalate (PET, polytrimethylene terephthalate (PTT, and polybutylene terephthalate (PBT under nonisothermal conditions in air and N2 at heating rates of 5, 10, 15, and 20°C/min. In this paper the kinetic degradation parameters of PET, PTT, and PBT were estimated using the Coats-Redfern method for two different weight loss regions ranging from 2–8% (Zone I and 8–40% (Zone II. A comparative analysis of the enthalpy-entropy compensation effect for these polyesters in air and N2 is presented. A linear relationship was found to exist between entropy and enthalpy values. The following criteria were applied to establish an enthalpy-entropy compensation effect and to check the presence of an isokinetic temperature: (a Exner’s plot of log k3T1 versus log k3T2, and (b Krug et al. linear regression of ΔH versus ΔG. By the use of the latter two methods, varying isokinetic temperatures were obtained. These temperatures were not in the range of the experimental work conducted, indicating that these systems do not display compensation phenomena.

  14. Development of Glass/Jute Fibers Reinforced Polyester Composite

    Directory of Open Access Journals (Sweden)

    Amit Bindal

    2013-01-01

    Full Text Available Composites play significant role as engineering material and their use has been increasing day by day due to their specific properties such as high strength to weight ratios, high modulus to weight ratio, corrosion resistance, and wear resistance. In present work, an attempt is made to hybridize the material using synthetic (glass as well as natural fibres (chemically treated jute, such that to reduce the overall use of synthetic reinforcement, to reduce the overall cost, and to enhance the mechanical properties. All composite specimens with different weight percentages of fibres were manufactured using hand lay-up process and testing was done by using ASTM standards. Experimental results revealed that hybridization of composite with natural and synthetic fibres shows enhanced tensile strength, flexural strength, and impact strength. The content of natural reinforcement was found to be in the range of 25–33.3% for best results. The effect of treated jute on flexural properties was more than that on tensile properties, which was due to greater stiffness of jute fibers. Chemical treatment of jute fibers lowers the water absorption and results were comparable to glass fiber reinforced polyester composites. The addition of jute also reduced the overall cost by 22.18%.

  15. Raman spectroscopy of thin-film silicon on woven polyester

    Energy Technology Data Exchange (ETDEWEB)

    Lind, Helena; Wilson, John [Department of Physics, School of Engineering and Physical Sciences, Heriot-Watt University, Riccarton, Edinburgh EH14 4AS (United Kingdom); Mather, Robert [Power Textiles Limited, Upland House, Ettrick Road, Selkirk TD7 5AJ (United Kingdom)

    2011-12-15

    Thin-film silicon deposited by plasma-enhanced chemical vapour deposition (PECVD), encompasses both hydrogenated amorphous silicon (a-Si:H) and 'nanocrystalline silicon' (nc-Si), the latter being a two-phase mixture of discrete nanocrystallites in an amorphous matrix. It is distinguished from a-Si:H by a characteristic Raman spectrum. As the film structure moves from amorphous to more crystalline, the Raman TO phonon spectral region no longer consists of a broad amorphous peak at {proportional_to}480 cm{sup -1} but instead has an obvious narrower peak located at higher wavenumber. The accepted signature peak for nc-Si lies between these two and most probably arises from the hexagonal, wurtzite structure of the nanocrystals. Here we use Raman spectroscopy to show how the structure of thin-film silicon on woven polyester is influenced by the substrate as well as by the deposition conditions. We find that the rough surface of the textile substrate enables nc-Si formation, provided that the correct deposition conditions are employed and that the substrate temperature does not exceed 210 C. Although the gas mixture is the dominant parameter for determining the film structure, and input power also has a significant effect, we find that a specific combination of these interrelated parameters is essential to control the final structure. (Copyright copyright 2011 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim)

  16. Adsorption of proteins from plasma at polyester non-wovens.

    Science.gov (United States)

    Klomp, A J; Engbers, G H; Mol, J; Terlingen, J G; Feijen, J

    1999-07-01

    Polyester non-wovens in filters for the removal of leukocytes from platelet concentrates (PCs) must be platelet compatible. In PC filtration, the adsorption of proteins at the plasma-non-woven interface can be of great importance with respect to the yield of platelets. Unmodified and radio frequency glow discharge (RFGD) treated poly(ethylene terephthalate) non-woven (NW-PET) and two commercial surface-modified non-wovens were contacted with human plasma. Protein desorption by sodium dodecyl sulphate (SDS) was evaluated by X-ray photoelectron spectroscopy (XPS). The desorbed proteins were characterized by gel electrophoresis and immunoblotting. Compared to the commercial surface-modified non-wovens, unmodified and RFGD-treated NW-PETs adsorbed a relatively high amount of protein. Significantly more protein was removed from the hydrophobic NW-PET by SDS than from the hydrophilic RFGD-treated non-wovens. RFGD treatment of NW-PET reduces the reversibility of protein adsorption. Less albumin and fibrinogen were removed from the RFGD-treated non-wovens than from NW-PET. In addition, a large amount of histidine-rich glycoprotein was removed from RFGD-treated non-wovens, but not from NW-PET. The different behaviour of RFGFD-treated non-wovens towards protein adsorption is probably caused by differences in the chemical reactivity of the non-woven surfaces.

  17. Viscoelastic properties of kenaf reinforced unsaturated polyester composites

    Science.gov (United States)

    Osman, Ekhlas A.; Mutasher, Saad A.

    2014-03-01

    In order to quantify the effect of temperature on the mechanical and dynamic properties of kenaf fiber unsaturated polyester composites, formulations containing 10 wt.% to 40 wt.% kenaf fiber were produced and tested at two representative temperatures of 30°C and 50°C. Dynamic mechanical analysis was performed, to obtain the strain and creep compliance for kenaf composites at various styrene concentrations. It is possible to obtain creep curves at different temperature levels which can be shifted along the time axis to generate a single curve known as a master curve. This technique is known as the time-temperature superposition principle. Shift factors conformed to a William-Landel-Ferry (WLF) equation. However, more long term creep data was needed in order to further validate the applicability of time-temperature superposition principle (TTSP) to this material. The primary creep strain model was fitted to 60 min creep data. The resulting equation was then extrapolated to 5.5 days; the creep strain model of power-law was successfully used to predict the long-term creep behavior of natural fiber/thermoset composites.

  18. Semipermeable membranes based on specified tetrabromobisphenol type polyesters

    Energy Technology Data Exchange (ETDEWEB)

    Kawakami, J.H.; Muruganandam, N.; Brode, G.L.

    1991-10-08

    This patent describes a process for separating a component from an O{sub 2}/N or CO{sub 2}/CH{sub 4} gas mixture containing. It comprises: contracting the gas mixture with one side of a gas separation membrane comprising a thin layer predominantly of a polyester or copolyester derived form the reaction of an aromatic dicarboxylic acid or derivative thereof and greater than 50 mol percent of a tetrabromobisphenol, or divalent cyclododecyl and wherein the aromatic discarboxylic acid or divalent cyclododecyl and wherein the aromatic dicarboxylic acid or derivative thereof comprises 80 mole percent or more of isophthalic acid or its dichloride and/or 4-bromoisophthalic acid or its dichloride and 20 mole percent or less of terephthalic acid or its dichlorid and/or 2-bromoterephthalic acid or its dichloride as the dicarboxylic acid compound, or 30 mole percent or less of isophthaloyl dichloride and/or 4-homoisophthalic acid or its dichloride and 70 mole percent or more of terephthalic acid or its dichloride and/or 2-bromoterepohthalic acid or is dichloride; the membrane having a combination of high selectivity and high permeation rate values, while maintaining a pressure differential across the two sides of the membrane and removing the permeated component from the other side of the membrane.

  19. Evaluating the effects of crystallinity in new biocompatible polyester nanocarriers on drug release behavior.

    Science.gov (United States)

    Karavelidis, Vassilios; Karavas, Evangelos; Giliopoulos, Dimitrios; Papadimitriou, Sofia; Bikiaris, Dimitrios

    2011-01-01

    Four new polyesters based on 1,3-propanediol and different aliphatic dicarboxylic acids were used to prepare ropinirole HCl-loaded nanoparticles. The novelty of this study lies in the use of polyesters with similar melting points but different degrees of crystallinity, varying from 29.8% to 67.5%, as drug nanocarriers. Based on their toxicity to human umbilical vein endothelial cells, these aliphatic polyesters were found to have cytotoxicity similar to that of polylactic acid and so may be considered as prominent drug nanocarriers. Drug encapsulation in polyesters was performed via an emulsification/solvent evaporation method. The mean particle size of drug-loaded nanoparticles was 164-228 nm, and the drug loading content was 16%-23%. Wide angle X-ray diffraction patterns showed that ropinirole HCl existed in an amorphous state within the nanoparticle polymer matrices. Drug release diagrams revealed a burst effect for ropinirole HCl in the first 6 hours, probably due to release of drug located on the nanoparticle surface, followed by slower release. The degree of crystallinity of the host polymer matrix seemed to be an important parameter, because higher drug release rates were observed in polyesters with a low degree of crystallinity.

  20. An experimental study of shock wave propagation through a polyester film

    Science.gov (United States)

    Eliasson, Veronica; Jeon, Hongjoo

    2016-11-01

    A polyester film is available in a variety of uses such as packaging, protective overlay, barrier protection, and other industrial applications. In the current study, shock tube experiments are performed to study the influence of a polyester film on the propagation of a planar shock wave. A conventional shock tube is used to create incident shock Mach numbers of Ms = 1.34 and 1.46. A test section of the shock tube is designed to hold a 0.009 mm, 0.127 mm, 0.254 mm, or 0.508 mm thick polyester film (Dura-Lar). High-temporal resolution schlieren photography is used to visualize the shock wave mitigation caused by the polyester film. In addition, four pressure transducers are used to measure the elapsed time of arrival and overpressure of the shock wave both upstream and downstream of the test section. Results show that the transmitted shock wave in the polyester film is clearly observed and the transmitted shock Mach number is decreased by increasing film thickness. This study is supported by the National Science Foundation under Grant No. CBET-1437412.

  1. Thermo-Responsive Injectable MPEG-Polyester Diblock Copolymers for Sustained Drug Release

    Directory of Open Access Journals (Sweden)

    Hoon Hyun

    2014-10-01

    Full Text Available Thermo-responsive diblock copolymers composed of hydrophilic methoxy poly(ethylene glycol (MPEG and hydrophobic biodegradable polyesters were prepared for application as injectable drug delivery systems, because they show a thermo-responsive sol-to-gel transition, especially around body temperature, when dispersed in aqueous solutions. The thermogelling hydrogels formed by hydrophobic aggregation could be varied by changing the components of the hydrophobic polyester part. For the polyester block in the present study, 95 mol% of ε-caprolactone (CL was used for the main polyester chain and 5 mol% of p-dioxanone (DO was copolymerized randomly by the MPEG initiator in the presence of HCl as the catalyst. By adding a small portion of DO into the poly ε-caprolactone (PCL chains, the temperature range of gelation, the intensity of viscosity and the drug release behavior were changed. The MPEG-b-poly(ε-caprolactone-ran-p-dioxanone (MPEG-b-PCDO hydrogel showed the enhanced drug release in vitro and in vivo compared to MPEG-b-PCL hydrogel. Therefore, MPEG-polyester hydrogels may serve as minimally invasive and therapeutic, injectable hydrogel systems with adjustable temperature-responsive and biodegradable windows, as well as sustained release of drugs over a certain time period.

  2. Mechanical performance of hybrid polyester composites reinforced Cloisite 30B and kenaf fibre

    Science.gov (United States)

    Bonnia, N. N.; Surip, S. N.; Ratim, S.; Mahat, M. M.

    2012-06-01

    Hybridization of rubber toughened polyester-kenaf nanocomposite was prepared by adding various percentage of kenaf fiber with 4% Cloisite 30B in unsaturated polyester resin. Composite were prepared by adding filler to modified polyester resin subsequently cross-linked using methyl ethyl ketone peroxide and the accelerator cobalt octanoate 1%. Three per hundred rubbers (phr) of liquid natural rubber (LNR) were added in producing this composite. This composite expected to be applied in the interior of passenger cars and truck cabins. This is a quality local product from a combination of good properties polyester and high performance natural fiber, kenaf that is suitable for many applications such as in automotive sector and construction sector. The mechanical and thermal properties of composite were characterized using Durometer Shore-D hardness test, Izod impact test, Scanning electron microscopy, thermogravimetry (TGA) and differential scanning calorimetry (DSC). Result shows that addition of LNR give good properties on impact, flexural and hardness compare to without LNR composite. DSC curve shows that all composition of composites is fully cured and good in thermal properties. Addition of higher percentage of kenaf will lead the composite to elastic behavior and decrease the toughened properties of the composite. Hybrid system composite showed the flexural properties within the flexural properties of kenaf - polyester and Cloisite 30B.

  3. Liquefaction of corn stover and preparation of polyester from the liquefied polyol.

    Science.gov (United States)

    Yu, Fei; Liu, Yuhuan; Pan, Xuejun; Lin, Xiangyang; Liu, Chengmei; Chen, Paul; Ruan, Roger

    2006-01-01

    This research investigated a novel process to prepare polyester from corn stover through liquefaction and crosslinking processes. First, corn stover was liquefied in organic solvents (90 wt% ethylene glycol and 10 wt% ethylene carbonate) with catalysts at moderate temperature under atmospheric pressure. The effect of liquefaction temperature, biomass content, and type of catalyst, such as H2SO4, HCl, H3PO4, and ZnCl2, was evaluated. Higher liquefaction yield was achieved in 2 wt% sulfuric acid, 1/4 (w/w) stover to liquefying reagent ratio; 160 degrees C temperature, in 2 h. The liquefied corn stover was rich in polyols, which can be directly used as feedstock for making polymers without further separation or purification. Second, polyester was made from the liquefied corn stover by crosslinking with multifunctional carboxylic acids and/or cyclic acid anhydrides. The tensile strength of polyester is about 5 MPa and the elongation is around 35%. The polyester is stable in cold water and organic solvents and readily biodegradable as indicated by 82% weight loss when buried in damp soil for 10 mo. The results indicate that this novel polyester could be used for the biodegradable garden mulch film production.

  4. Recent developments and future prospects on bio-based polyesters derived from renewable resources: A review.

    Science.gov (United States)

    Zia, Khalid Mahmood; Noreen, Aqdas; Zuber, Mohammad; Tabasum, Shazia; Mujahid, Mohammad

    2016-01-01

    A significantly growing interest is to design a new strategy for development of bio-polyesters from renewable resources due to limited fossil fuel reserves, rise of petrochemicals price and emission of green house gasses. Therefore, this review aims to present an overview on synthesis of biocompatible, biodegradable and cost effective polyesters from biomass and their prospective in different fields including packaging, coating, tissue engineering, drug delivery system and many more. Isosorbide, 2,4:3,5-di-O-methylene-d-mannitol, bicyclic diacetalyzed galactaric acid, 2,5-furandicarboxylic acid, citric, 2,3-O-methylene l-threitol, dimethyl 2,3-O-methylene l-threarate, betulin, dihydrocarvone, decalactone, pimaric acid, ricinoleic acid and sebacic acid, are some important monomers derived from biomass which are used for bio-based polyester manufacturing, consequently, replacing the petrochemical based polyesters. The last part of this review highlights some recent advances in polyester blends and composites in order to improve their properties for exceptional biomedical applications i.e. skin tissue engineering, guided bone regeneration, bone healing process, wound healing and wound acceleration. Copyright © 2015 Elsevier B.V. All rights reserved.

  5. The Degradation of Mechanical Properties in Halloysite Nanoclay-Polyester Nanocomposites Exposed in Seawater Environment

    Directory of Open Access Journals (Sweden)

    Mohd Shahneel Saharudin

    2016-01-01

    Full Text Available Polyester based polymers are extensively used in aggressive marine environments; however, inadequate data is available on the effects of the seawater on the polyester based nanocomposites mechanical properties. This paper reports the effect of seawater absorption on the mechanical properties degradation of halloysite nanoclay-polyester nanocomposites. Results confirmed that the addition of halloysite nanoclay into polyester matrix was found to increase seawater uptake and reduce mechanical properties compared to monolithic polyester. The maximum decreases in microhardness, tensile and flexural properties, and impact toughness were observed in case of 1 wt% nanoclay. The microhardness decreased from 107 HV to 41.7 HV (61% decrease. Young’s modulus decreased from 0.6 GPa to 0.4 GPa (33% decrease. The flexural modulus decreased from 0.6 GPa to 0.34 GPa (43% decrease. The impact toughness dropped from 0.71 kJ/m2 to 0.48 kJ/m2 (32% decrease. Interestingly, the fracture toughness KIC increased with the addition of halloysite nanoclay due to the plasticization effect of the resin matrix. SEM images revealed the significant reduction in mechanical properties in case of 1 wt% reinforcement which is attributed to the degradation of the nanoclay-matrix interface influenced by seawater absorption and agglomeration of halloysite nanoclay.

  6. 77 FR 4543 - Certain Polyester Staple Fiber From Taiwan: Extension of Time Limit for Preliminary Results of...

    Science.gov (United States)

    2012-01-30

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF COMMERCE International Trade Administration Certain Polyester Staple Fiber From Taiwan: Extension of Time Limit for... antidumping duty order on certain polyester staple fiber from Taiwan for the period May 1, 2010, through...

  7. 75 FR 70906 - Certain Polyester Staple Fiber From the People's Republic of China: Partial Rescission of the...

    Science.gov (United States)

    2010-11-19

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF COMMERCE International Trade Administration Certain Polyester Staple Fiber From the People's Republic of China: Partial... certain polyester staple fiber (``PSF'') from the People's Republic of China (``PRC'') for the period...

  8. 76 FR 5331 - Certain Polyester Staple Fiber From Taiwan: Extension of Time Limit for Preliminary Results of...

    Science.gov (United States)

    2011-01-31

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF COMMERCE International Trade Administration Certain Polyester Staple Fiber From Taiwan: Extension of Time Limit for... antidumping duty order on certain polyester staple fiber from Taiwan for the period May 1, 2009, through...

  9. 76 FR 69702 - Certain Polyester Staple Fiber From the People's Republic of China: Final Results of Antidumping...

    Science.gov (United States)

    2011-11-09

    ....20.0025 and known to the industry as polyester staple fiber for spinning and generally used in woven... carpeting; and (3) low-melt polyester staple fiber defined as a bi- component fiber with an outer, non... and non-PRC exporters not listed above that have separate rates, the cash deposit rate will...

  10. Environmentally benign synthesis of saturated and unsaturated aliphatic polyesters via enzymatic polymerization of biobased monomers derived from renewable resources

    NARCIS (Netherlands)

    Jiang, Yi; Woortman, Albert J. J.; van Ekenstein, Gert O. R. Alberda; Loos, Katja

    2015-01-01

    Aliphatic polyesters are of great interest due to their broad potential applications and sustainability. Itaconate-based aliphatic polyesters are even more appealing in biomedical and pharmaceutical fields, as they are renewable functional polymers that can be biodegradable, biocompatible, and photo

  11. 纬编涤锦复合长丝毛巾布的染整%Wet processing of weft knitted polyamide/polyester composite filament terry cloth

    Institute of Scientific and Technical Information of China (English)

    曾志丰; 高丽贤; 蒋卫强

    2011-01-01

    在生产大红色纬编涤锦复合长丝毛巾布中,采用染色与亲水同浴整理,成品的干、湿摩擦牢度和皂洗牢度均达到4级,渗透时间为4 s,且织物布面均匀、柔软.%The scarlet weft knitted polyamide/polyester filament towel fabric is produced with dyeing and hydrophilic treatment in one bath. The finished product features soft handle, good wet/dry rubbing fastness and soaping fastness up to grade 4, as well as good hydrophilicity with penetration time of 4 seconds.

  12. The Effects of TiO2 Nanoparticles over Time on the Physical and Mechanical Properties of White Cotton Fabrics and Fabrics Died with Reactive Dyes

    Directory of Open Access Journals (Sweden)

    Mohammadreza Mirkhan

    2016-05-01

    Full Text Available Today, nano particles of titanium are used mainly in the textile industry. Examples of it can be named as cultivation of nano particles of titanium on polyester cotton fabrics, with features as white-washing, self- cleaning and also the effect of TiO2 on the dyed textiles with natural dyes as well as the effect of commodities reactive to increase the brightness and transparency of them. But, as this procedure has the added benefits, it will sure have some disadvantages and thus, the aim of this project is to study the effects of nano- TiO2 in the passage of time, at different times over the physical and mechanical properties of checked cotton fabrics. And even the study of dyed fabrics with natural dyes in reactive so that it can examine the beneficial and harmful effects of the degradation and also check the results on the Cotton Nano TiO2 Fabric.

  13. A critical review of algal biomass: A versatile platform of bio-based polyesters from renewable resources.

    Science.gov (United States)

    Noreen, Aqdas; Zia, Khalid Mahmood; Zuber, Mohammad; Ali, Muhammad; Mujahid, Mohammad

    2016-05-01

    Algal biomass is an excellent renewable resource for the production of polymers and other products due to their higher growth rate, high photosynthetic efficiency, great potential for carbon dioxide fixation, low percentage of lignin and high amount of carbohydrates. Algae contain unique metabolites which are transformed into monomers suitable for development of novel polyesters. This review article mainly focuses on algal bio-refinery concept for polyester synthesis and on exploitation of algae-based biodegradable polyester blends and composites in tissue engineering and controlled drug delivery system. Algae-derived hybrid polyester scaffolds are extensively used for bone, cartilage, cardiac and nerve tissue regeneration due to their biocompatibility and tunable biodegradability. Microcapsules and microspheres of algae-derived polyesters have been used for controlled and continuous release of several pharmaceutical agents and macromolecules to produce humoral and cellular immunity with efficient intracellular delivery. Copyright © 2016 Elsevier B.V. All rights reserved.

  14. Thermotropic liquid crystalline polyesters derived from bis-(4-hydroxybenzoyloxy)-2-methyl-1,4-benzene and aliphatic dicarboxylic acid chlorides

    Indian Academy of Sciences (India)

    Khudbudin Mulani; Mohasin Momin; Nitin Ganjave; Nayaku Chavan

    2015-09-01

    A series of thermotropic liquid crystalline polyesters derived from bis-(4-hydroxybenzoyloxy)-2-methyl-1,4-benzene (BHBOMB) and aliphatic dicarboxylic acid chlorides were investigated. All these polyesters were synthesized by interfacial polycondensation method and characterized by differential scanning calorimetry and wide-angle X-ray diffractometer. These polyesters consist of BHBOMB as a mesogenic diol and aliphatic diacid chlorides were used as flexible spacers. The length of oligomethylene units in polymer was varied from the trimethylene to the dodecamethylene groups. The transition temperatures and thermodynamic properties were studied for all these polymers. All these polyesters were soluble in chlorinated solvents such as chloroform, dichloromethane, dichloroethane, etc. More importantly, all these polyesters exhibited very large mesophase stability.

  15. Effect of Some Fabric and Sewing Conditions on Apparel Seam Characteristics

    Directory of Open Access Journals (Sweden)

    A. K. Choudhary

    2013-01-01

    Full Text Available Many previous studies showed that seam appearance as well as performance depends on the interrelationship of fabrics, threads, and the stitch/seam selection and lastly on the sewing conditions, which include the needle size, needle thread tension, stitch density, and the appropriate operation and maintenance of the sewing machine. Present investigation elucidates the effect of blend composition, sewing thread size, and sewing needle parameters on garment seam characteristics (i.e., seam strength, seam strength efficiency, seam puckering, seam stiffness, and drape coefficient. The seam quality characterization is studied through the L9 orthogonal design methodology. In good quality apparels, compatibility of the seams with the functional requirement is very important for serviceability and life of the apparel. Reversibility as well as repairing of seams in the apparel is very limited in the condition of seam failure. Seam strength efficiency is higher for the uniform fiber matrix in the structure of fabrics. The polyester dominated suiting fabrics give minimum seam stiffness because polyester component has low flexural rigidity. The cotton dominated suiting fabrics have less seam puckering due to increase in fabric stiffness.

  16. Photoinduced anisotropy in a family of amorphous azobenzene polyesters for optical storage

    DEFF Research Database (Denmark)

    Nedelchev, Lian; Matharu, Avtar S.; Hvilsted, Søren

    2003-01-01

    We investigate parameters associated with optical data storage in a variety of amorphous side-chain azobenzene-containing polyesters denoted as E1aX. The polyesters possess a common cyano-substituted azobenzene chromophore as a side chain, but differ in their main-chain polyester composition....... Seventeen different polymers from the E1aX family divided into four classes, depending on the type of the main-chain substituent (one-, two-, and three-ring aromatic or alicyclic) have been thoroughly investigated. Various parameters characterizing the photoinduced birefringence in these materials...... of E1aX polymers characterized by two-ring aromatic substituent in the main chain is a good candidate for optical data storage media. A recording energy of approximately 2 J/cm(2) is sufficient to induce high refractive-index modulations of Deltan = 0.13 in these materials, which is retained even...

  17. Synthesis and Characterization of Anionic Polyester-Polyurethane Dispersion as Environmentally-Friendly Waterbased Resins

    Directory of Open Access Journals (Sweden)

    Najaf i F. Manouchehri F., and Shaabanz

    2012-01-01

    Full Text Available Aqueous polyurethane dispersions (PUDs have recently emerged as important alternatives to their solvent-based counterparts for various applications due to increasing health and environmental awareness (green chemistry. Anionic polyester-polyurethane dispersions were synthesized by three steps. In the first step, macromonomer diisocyanate having carboxylic acid was prepared by isophorone diisocyanate (IPDI, dimethylol propionic acid (DMPA in percent of acetone as solvent and dibutyldtin dilaurate (DBTDL as catalyst. Then, carboxylic polyurethane was prepared by reaction macromonomer diisocyanate having carboxylic acid with linear aliphatic polyester (Mw=2000, trifunctional polyester (Mw=2800 and butanediol (BDO as chain extender. The next step involved neutralization and dispersion in water, where acidic polyurethane was neutralized by the addition of triethylamine (TEA.  Factors influencing the synthesis of polyurethane dispersion mainly involve reaction temperature, reaction time, the concentration of catalyst, DMPA content and BDO content, were studied. The polymers have been characterized with DSC and FTIR.

  18. Proton-transfer polymerization (HTP): converting methacrylates to polyesters by an N-heterocyclic carbene.

    Science.gov (United States)

    Hong, Miao; Chen, Eugene Y-X

    2014-10-27

    A new polymerization termed proton (H)-transfer polymerization (HTP) has been developed to convert dimethacrylates to unsaturated polyesters. HTP is catalyzed by a selective N-heterocyclic carbene capable of promoting intermolecular Umpolung condensation through proton transfer and proceeds through the step-growth propagation cycles via enamine intermediates. The role of the added suitable phenol, which is critical for achieving an effective HTP, is twofold: shutting down the radically induced chain-growth addition polymerization under HTP conditions (typically at 80-120 °C) and facilitating proton transfer after each monomer enchainment. The resulting unsaturated polyesters have a high thermal stability and can be readily cross-linked to robust polyester materials. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  19. Ammonium Y zeolite applied as a thermochemolysis reagent for identification of polyethers and polyesters.

    Science.gov (United States)

    Blazsó, Marianne; Bozi, János

    2013-01-04

    A potential thermochemolysis reagent has been tested for the pyrolysis gas chromatographic identification of polyether, polyester and polyether- or polyester-based thermoplastic polyurethane. The main advantage of ammonium Y zeolite over liquid reagents is that it does not react prior to pyrolysis, and its reactions have no incomplete products. The procedure of the thermochemolysis is as simple as running a pyrolysis-GC/MS analysis sampling a powder mixture of roughly equal mass of polymer and ammonium Y zeolite. The GC/MS chromatograms obtained show that the products of thermochemolysis are specific to the diol and dicarboxylic units of the polymer. It was observed that ethanal or 1,4-dioxane forms from ethylene oxide components of polyethers and polyesters, tetrahydrofuran from butylene oxide units, hexanedinitrile from adipate groups, and benzodinitrile from terephthalate groups.

  20. A model for biodegradation of composite materials made of polyesters and tricalcium phosphates.

    Science.gov (United States)

    Pan, Jingzhe; Han, Xiaoxiao; Niu, Wenjuan; Cameron, Ruth E

    2011-03-01

    A saturation behaviour has been observed when incorporating tricalcium phosphate (TCP) in various polyesters to control the degradation rate. This paper presents an understanding of this behaviour using a mathematical model. The coupled process of hydrolysis reaction of the ester bonds, acid dissociation of the carboxylic end groups, dissolution of the calcium phosphates and buffering reactions by the dissolved phosphate ions is modelled together using a set of differential equations. Two non-dimensional groups of the material and chemical parameters are identified which control the degradation rate of the composites. An effectiveness map is established to show the conditions under which incorporating TCP into polyesters is effective, saturated or ineffective. Comparisons are made between the model predictions and existing experimental data in the literature. The map provides a useful tool to guide the design of polyester/TCP composites for tissue engineering and orthopaedic fixation applications.