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Sample records for acrylic resins

  1. [Acrylic resin removable partial dentures

    Baat, C. de; Witter, D.J.; Creugers, N.H.J.

    2011-01-01

    An acrylic resin removable partial denture is distinguished from other types of removable partial dentures by an all-acrylic resin base which is, in principle, solely supported by the edentulous regions of the tooth arch and in the maxilla also by the hard palate. When compared to the other types of

  2. 21 CFR 573.120 - Acrylamide-acrylic acid resin.

    2010-04-01

    ... 21 Food and Drugs 6 2010-04-01 2010-04-01 false Acrylamide-acrylic acid resin. 573.120 Section 573... Food Additive Listing § 573.120 Acrylamide-acrylic acid resin. Acrylamide-acrylic acid resin... acrylamide with partial hydrolysis, or by copolymerization of acrylamide and acrylic acid with the...

  3. Bonding auto-polymerising acrylic resin to acrylic denture teeth.

    Nagle, Susan

    2009-09-01

    This study investigated the effect of surface treatments on the shear bond strength of an auto-polymerising acrylic resin cured to acrylic denture teeth. The surface treatments included a combination of grit-blasting and\\/or wetting the surface with monomer. Samples were prepared and then stored in water prior to shear testing. The results indicated that the application of monomer to the surface prior to bonding did not influence the bond strength. Grit blasting was found to significantly increase the bond strength.

  4. Synthesis of highly carboxylate acrylic resins for leather impregnation

    Ollé Otero, Lluís; Solé, M.M.; Shendrik, Alexander; Labastida, L.; Bacardit Dalmases, Anna

    2012-01-01

    This work describes the synthesis of new leather finishing acrylic resins. Four resins ware synthesized varying the concentration of ethyl acrylate, and metracrylic acid. Sodium lauryl sulphate was used as emulsifying system. By means of an experimental design, an optimal resin for leather impregnation was defined. The results obtained indicated that the variation of the monomer concentration influences the resin properties, the hardness of the film, and the penetration into the leather. Most...

  5. Artificial saliva effect on toxic substances release from acrylic resins

    Kostić Milena; Krunić Nebojša; Najman Stevo; Nikolić Ljubiša; Nikolić Vesna; Rajković Jelena; Petrović Milica; Igić Marko; Ignjatović Aleksandra

    2015-01-01

    Background/Aim. Acrylic-based resins are intensively used in dentistry practice as restorative or denture-base materials. The purpose of this study was to analyze the surface structure of denture base resins and the amount of released potentially toxic substances (PTS) immediately upon polymerization and incubation in different types of artificial saliva. Methods. Storage of acrylic samples in two models of artificial saliva were performed in a water bath a...

  6. Artificial saliva effect on toxic substances release from acrylic resins

    Kostić Milena

    2015-01-01

    Full Text Available Background/Aim. Acrylic-based resins are intensively used in dentistry practice as restorative or denture-base materials. The purpose of this study was to analyze the surface structure of denture base resins and the amount of released potentially toxic substances (PTS immediately upon polymerization and incubation in different types of artificial saliva. Methods. Storage of acrylic samples in two models of artificial saliva were performed in a water bath at the temperature of 37 ± 1°C. Analysis of the surface structure of samples was carried out using scanning electronic microscopy analysis immediately after polymerization and after the 30-day incubation. The amounts of PTS per day, week and month extracts were measured using high-pressure liquid chromatography. Results. Surface design and amount of PTS in acrylic materials were different and depended on the types and duration of polymerization. The surfaces of tested acrylates became flatter after immersing in solutions of artificial saliva. The degree of acrylic materials release was not dependent on the applied model of artificial saliva. Conclusion. In order to improve biological features of acrylic resin materials, it was recommended that dentures lined with soft or hard coldpolymerized acrylates should be kept at least 1 to 7 days in water before being given to a patient. So, as to reach high degree of biocompatibility preparation of prosthetic restorations from heat-polymerized acrylate was unnecessary. [Projekat Ministarstva nauke Republike Srbije, br. 41017

  7. Performance comparison of acrylic and thiol-acrylic resins in two-photon polymerization.

    Jiang, Lijia; Xiong, Wei; Zhou, Yushen; Liu, Ying; Huang, Xi; Li, Dawei; Baldacchini, Tommaso; Jiang, Lan; Lu, Yongfeng

    2016-06-13

    Microfabrication by two-photon polymerization is investigated using resins based on thiol-ene chemistry. In particular, resins containing different amounts of a tetrafunctional acrylic monomer and a tetrafunctional thiol molecule are used to create complex microstructures. We observe the enhancement of several characteristics of two-photon polymerization when using thiol-acrylic resins. Specifically, microfabrication is carried out using higher writing velocities and it produces stronger polymeric microstructures. Furthermore, the amount of shrinkage typically observed in the production of three-dimensional microstructures is reduced also. By means of microspectrometry, we confirm that the thiol-acrylate mixture in TPP resins promote monomer conversion inducing a higher degree of cross-linked network formation. PMID:27410383

  8. The Evaluation of Water Sorption/Solubility on Various Acrylic Resins

    Tuna, Suleyman Hakan; Keyf, Filiz; Gumus, Hasan Onder; Uzun, Cengiz

    2008-01-01

    Objectives The absorption of water by acrylic resins is a phenomenon of considerable importance since it is accompanied by dimensional changes, a further undesirable effect of absorbed water in acrylic resins to reduce the tensile strength of the material. Solubility is also an important property because it represents the mass of soluble materials from the polymers. Methods Ten acrylic resin-based materials were evaluated: two heat cure acrylic resins (De Trey QC-20, Meliodent Heat Cure) and ...

  9. Bond strength between acrylic resin and maxillofacial silicone

    Marcela Filié Haddad

    2012-12-01

    Full Text Available The development of implant dentistry improved the possibilities of rehabilitation with maxillofacial prosthesis. However, clinically it is difficult to bond the silicone to the attachment system. OBJECTIVES: This study aimed to evaluate the effect of an adhesive system on the bond strength between acrylic resin and facial silicone. MATERIAL AND METHODS: A total of 120 samples were fabricated with auto-polymerized acrylic resin and MDX 4-4210 facial silicone. Both materials were bonded through mechanical retentions and/or application of primers (DC 1205 primer and Sofreliner primer S and adhesive (Silastic Medical Adhesive Type A or not (control group. Samples were divided into 12 groups according to the method used to attach the silicone to the acrylic resin. All samples were subjected to a T-peel test in a universal testing machine. Failures were classified as adhesive, cohesive or mixed. The data were evaluated by the analysis of variance (ANOVA and the Tukey's HSD test (α=.05. RESULTS: The highest bond strength values (5.95 N/mm; 3.07 N/mm; 4.75 N/mm were recorded for the samples that received a Sofreliner primer application. These values were significantly higher when the samples had no scratches and did not receive the application of Silastic Medical Adhesive Type A. CONCLUSIONS: The most common type of failure was adhesive. The use of Sofreliner primer increased the bond strength between the auto-polymerized acrylic resin and the Silastic MDX 4-4210 facial silicone.

  10. 21 CFR 173.5 - Acrylate-acrylamide resins.

    2010-04-01

    ... 21 Food and Drugs 3 2010-04-01 2009-04-01 true Acrylate-acrylamide resins. 173.5 Section 173.5 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) FOOD FOR HUMAN CONSUMPTION (CONTINUED) SECONDARY DIRECT FOOD ADDITIVES PERMITTED IN FOOD FOR HUMAN CONSUMPTION Polymer Substances and Polymer Adjuvants...

  11. 21 CFR 176.110 - Acrylamide-acrylic acid resins.

    2010-04-01

    ... 21 Food and Drugs 3 2010-04-01 2009-04-01 true Acrylamide-acrylic acid resins. 176.110 Section 176.110 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) FOOD FOR HUMAN CONSUMPTION (CONTINUED) INDIRECT FOOD ADDITIVES: PAPER AND PAPERBOARD COMPONENTS Substances for Use Only as Components of Paper...

  12. Nanopigmented Acrylic Resin Cured Indistinctively by Water Bath or Microwave Energy for Dentures

    L. S. Acosta-Torres; Arenas, M. C.; R. E. Nuñez­-Anita; F. H. Barceló-Santana; C. A. Álvarez-Gayosso; Palacios-Alquisira, J.; J. de la Fuente-Hernández; Marcos Cajero-Juárez; V. M. Castaño

    2014-01-01

    The highlight of this study was the synthesis of nanopigmented poly(methyl methacrylate) nanoparticles that were further processed using a water bath and/or microwave energy for dentures. The experimental acrylic resins were physicochemically characterized, and the adherence of Candida albicans and biocompatibility were assessed. A nanopigmented acrylic resin cured by a water bath or by microwave energy was obtained. The acrylic specimens possess similar properties to commercial acrylic resin...

  13. Synthesis and Demulsibility of the Terpolymer Demulsifier of Acryl Resin

    KANG,Wan-Li; MENG,Ling-Wei; ZHANG,Hong-Yan; LIU,Shu-Ren

    2008-01-01

    Terpolymer demulsifier of acryl resin has been synthesized through solution polymerization with water as a dissolvent,potassium persulfate as an initiator and the monomers of methyl methacrylate,butyl acrylate and acrylic acid as starting materials.The effects of the reaction temperature,dripping time,the amount of monomers and initiator on the dehydration rate of the demulsifier were investigated by an orthogonal experiment.It shows that the stronger influence on the dehydration rate among six factors is reaction temperature,dripping time,and amount of catalyst,while monomer has weak influence.The performance of the demulsifier was evaluated under different demulsification time,temperatures and concentrations of the screened demulsifiers.The result shows that the dehydration rate of the demulsifier can reach over 67%,which is better than that by the emulsion polymerization way.

  14. Insights on the biodegradation of acrylic reline resins

    Neves, Maria Cristina Bettencourt, 1976-

    2012-01-01

    Acrylic reline resins are extensively used in dentistry, since they readapt dentures to the continuous reabsorbed underlying tissues. Since present in the oral cavity for long periods of time, these materials are objective of the biodegradation phenomena, which represents the change on their chemical, physical and mechanical properties due to the oral environment conditions and its constituents. These processes may permanently alter the properties of the material and compromise its function. ...

  15. Elastic modulus and flexural strength comparisons of high-impact and traditional denture base acrylic resins

    Nour M. Ajaj-ALKordy

    2014-01-01

    Conclusion: Within the limitations of this study, it can be concluded that the high-impact acrylic resin is a suitable denture base material for patients with clinical fracture of the acrylic denture.

  16. Hyperbranched Acrylated Aromatic Polyester Used as a Modifier in UV-Curable Epoxy Acrylate Resins

    KOU,Hui-Guang; ASIF,Anila; SHI,Wen-Fang

    2003-01-01

    The viscosity, the shrinkage degree and the photoplymerization rate of the epoxy acrylate (EB600 ) blended with hyperbranched acrylated aromatic polyester ( HAAPE ) were investigated. The addition of HAAPE into EB600 largely reduces the viscosity of the blend formulation and the shrinkage degree. For example, EB600resin with 50% weight fraction of HAAPE has the 1250 cps of the viscosity and 2.0% of shrinkage degree, while the pure EB600 resin has 3000 cps of the viscosity and 10.5% of shrinkage degree. The photopolymerization rate of the rein is also promoted by HAAPE addition. The good miscibility between HAAPE and EB600 was also observed from the dynamic mechanical analysis. The tensile, flexural and compressive strength, and the thermal properties of the UVcured films are greatly improved.

  17. Effect of Nanoclay on Thermal Conductivity and Flexural Strength of Polymethyl Methacrylate Acrylic Resin

    Tahereh Ghaffari; Ali Barzegar; Fahimeh Hamedi Rad; Elnaz Moslehifard

    2016-01-01

    Statement of the Problem: The mechanical and thermal properties of polymethyl methacrylate (PMMA) acrylic resin should be improved to counterweigh its structural deficiencies. Purpose: The aim of this study was to compare the flexural strength and thermal conductivity of conventional acrylic resin and acrylic resin loaded with nanoclay. Materials and Method: The methacrylate monomer containing the 0.5, 1 and 2 wt% of nanoclay was placed in an ultrasonic probe and mixed with the PMMA p...

  18. Synthesis and Application of a New Acrylic Ester Resin for Recycling SIPA from its Water Solution

    2005-01-01

    A new acrylic ester polymer YWB-7 resin was prepared and characterized. The properties of YWB-7 resin were compared with those of the commercial Amberlite XAD-7, Diaion HP2MG and hypercrosslinked macroporous polymer NDA-150 resins. Both surface area and micropore area of YWB-7 resin were bigger than those of XAD-7 resin and HP2MG resin. The YWB-7 resin was successfully employed to recycle 5-sodiosulfoisophthalic acids (SIPA) from its solutions with and without methanol.

  19. INCIDENCE AND CAUSES OF FRACTURE OF ACRYLIC RESIN COMPLETE DENTURE

    Sampa

    2014-12-01

    Full Text Available CONTEXT (BACKGROUND: Replacement of missing teeth and the associated structures are done with the help of artificial prosthesis. Acrylic resin, by virtue of its excellent properties is widely used as a material of choice for fabrication of denture base. In spite of its higher esthetic quality, tissue compatibility and ease of manipulation, it has an inherent deficiency of proneness to fracture. AIMS: The present study was being undertaken to find out the incidence of fracture of acrylic resin base of complete denture and analyze the cause, so that suitable remedial measures might be suggested to reduce the frequency of denture fracture. SETTINGS AND DESIGN: The present study was conducted over a period of 18 months in the Prosthetic Department of Dr R Ahmed Dental College & Hospital, Kolkata. METHODS AND MATERIAL: The 81 reported fracture cases out of 646 complete dentures were selected for this study. Formally consent followed by detailed history was taken. After intra-oral and physical examination, the dentures were repaired following text book recommended procedure using cold cure acrylic resin and prepared for last phase of survey, which was the intra oral examination like adaptation, retention and stability of the repaired dentures in the second visit of the patients. STATISTICAL ANALYSIS: The data were subjected to SPSS, version 16, and statistically analyzed using cross tab. RESULTS: In the present survey, 81 cases of complete denture fractures have been reported within the survey period. CONCLUSIONS: It appears from the present study, the rate of lower complete denture fracture is more common than upper complete denture fracture

  20. A comparison of shear bond strength of ceramic and resin denture teeth on different acrylic resin bases

    Corsalini, Massimo; Venere, Daniela Di; Pettini, Francesco; Stefanachi, Gianluca; Catapano, Santo; Boccaccio, Antonio; Lamberti, Luciano; Pappalettere, Carmine; Carossa, Stefano

    2014-01-01

    The purpose of this study is to compare the shear bond strength of different resin bases and artificial teeth made of ceramic or acrylic resin materials and whether tooth-base interface may be treated with aluminium oxide sandblasting. Experimental measurements were carried on 80 specimens consisting of a cylinder of acrylic resin into which a single tooth is inserted. An ad hoc metallic frame was realized to measure the shear bond strength at the tooth-base interface. A complete factorial pl...

  1. Flexural strength of acrylic resins polymerized by different cycles

    Débora Barros Barbosa

    2007-10-01

    Full Text Available Despite the large number of studies addressing the effect of microwave polymerization on the properties of acrylic resin, this method has received limited clinical acceptance. This study evaluated the influence of microwave polymerization on the flexural strength of a denture base resin. A conventional heat-polymerized (Clássico, a microwave-polymerized (Onda-Cryl and a autopolymerizing acrylic (Jet resins were used. Five groups were established, according to polymerization cycles: A, B and C (Onda-Cryl, short cycle - 500W/3 min, long - 90W/13 min + 500W/90 sec, and manufacturing microwave cycle - 320W/3 min + 0W/3 min + 720W/3 min; T (Clássico, water bath cycle - 74ºC/9h and Q (Jet, press chamber cycle - 50ºC/15 min at 2 bar. Ten specimens (65 x 10 x 3.3mm were prepared for each cycle. The flexural strength of the five groups was measured using a three-point bending test at a cross-head speed of 5 mm/min. Flexural strength values were analyzed by one-way ANOVA and the Tukey's test was performed to identify the groups that were significantly different at 5% level. The microwave-polymerized groups showed the highest means (p<0.05 for flexural strength (MPa (A = 106.97 ± 5.31; B = 107.57 ± 3.99; C = 109.63 ± 5.19, and there were no significant differences among them. The heat-polymerized group (T showed the lowest flexural strength means (84.40 ± 1.68, and differ significantly from all groups. The specimens of a microwavable denture base resin could be polymerized by different microwave cycles without risk of decreasing the flexural strength.

  2. The transverse strength of acrylic resin after Coleus amboinicus, Lour extract solution immersion

    Devi Rianti

    2006-12-01

    Full Text Available A laboratoric experimental study was conducted on the transverse strength of acrylic resin after Coleus amboinicus, Lour extract solution immersion. The aim of this study is to know the difference of acrylic resin transverse strengths caused by immersion time variations in a concentrate solution. The study was carried out on unpolished acrylic resin plates with 65 × 10 × 2,5 mm dimension; solution with 15% Coleus amboinicus, Lour extract, and 30, 60, 90 days immersion times to measure the transverse strength and sterilized aquadest was used as control. Acrylic resin plates transverse strength was measured using Autograph AG-10 TE. The data was analyzed using One-Way Anova and LSD with 5% degree of significance. The result showed that longer immersion time will decrease the transverse strength of the acrylic resin plates. After 90 days immersion time, the transverse strength decrease is still above the recommended standard transverse strength.

  3. Effects of Chairside Polishing and Brushing on Surface Roughness of Acrylic Denture Base Resins

    Seung-Kyun Kim; Ju-Mi Park; Min-Ho Lee; Jae-Youn Jung; Shipu Li; Xinyu Wang

    2009-01-01

    The effects of 3 chairside polishing kits and mechanical brushing on the surface roughness of 3 different acrylic denture base resins were compared. Acrylic denture base resins (auto-polymerizing, heat-polymerizing, injected heat-polymerizing resins) were examined after a tungsten carbide bur, and after chairside polishing using 3 polishing kits and pumice. The specimens were subjected to mechanical brushing using a wear tester to simulate 30 000 strokes of brushing. The surface roughness of the acrylic denture base resin specimens was measured using a contact pro-filometer. After the test, the random polished acrylic resins were evaluated by scanning electron mi-croscopy (SEM) and atomic force microscopy (AFM). Acrylic denture base resins polished using the 3 types of polishing kits had a smoother surface than those finished with the tungsten carbide bur (p <0.05). The surface of the resin polished by a TC cutter exceeded the Ra of 0.2 μm (p<0.05). The auto-polymerizing resin showed a significantly higher surface roughness than the heat-polymerizing resin and injected heat-polymerizing resin (p>0.05). In the case of polishing step wise, there was almost no change in surface roughness after brushing (p>0.05).

  4. Flexural Strength of Cold and Heat Cure Acrylic Resins Reinforced with Different Materials

    Bijan Heidari

    2015-10-01

    Full Text Available Objectives: Heat-polymerized acrylic resin has been the most commonly used denture base material for over 60 years. However, the mechanical strength of acrylic resin is not adequate for long-term clinical performance of dentures. Consequently, fracture is a com- mon clinical occurrence, which often occurs in the midline of denture base.This study aimed to evaluate the efficacy of cold cure and heat cure acrylic resins, rein- forced with glass fibers, polyethylene fibers, and metal wire for denture base repair.Materials and Methods: Ninety specimens were prepared and allocated to nine groups. Ten specimens were included in the control group, and 80 were allocated to 8 experi- mental groups. In the experimental groups, the specimens were sectioned into two halves from the middle, and were then divided into two main groups: one group was repaired with heat cure acrylic resin, and the other with cold cure acrylic resin. Each group was di- vided into 4 subgroups: unreinforced, reinforced with glass fibers, polyethylene fibers, and metal wire. All specimens were then subjected to a 3-point bending test, and the flexural strength was calculated.Results: The group repaired with heat cure acrylic resin and reinforced with glass fiber showed the highest flexural strength; however, the group repaired with cold cure acrylic resin and reinforced with polyethylene fibers had the lowest flexural strength. There was no significant difference between the groups repaired with heat cure and cold cure acrylic resins without reinforcement.Conclusion: Repairing denture base with heat cure acrylic resin, reinforced with glass fi- bers increases the flexural strength of denture base.

  5. Assessment of the flexural strength of two heat-curing acrylic resins for artificial eyes

    Aline Úrsula Rocha Fernandes; Aline Portugal; Letícia Rocha Veloso; Marcelo Coelho Goiato; Daniela Micheline dos Santos

    2009-01-01

    Prosthetic eyes are artificial substitutes for the eyeball, made of heat-curing acrylic resin, serving to improve the esthetic appearance of the mutilated patient and his/her inclusion in society. The aim of this study was to assess the flexural strength of two heat-curing acrylic resins used for manufacturing prosthetic eyes. Thirty-six specimens measuring 64 x 10 x 3.3 mm were obtained and divided into four groups: acrylic resin for artificial sclera N1 (Artigos Odontológicos Clássico, São ...

  6. Tensile bond strength between auto-polymerized acrylic resin and acrylic denture teeth treated with MF-MA solution

    2016-01-01

    PURPOSE This study evaluated the effect of chemical surface treatment using methyl formate-methyl acetate (MF-MA) solution on the tensile bond strength between acrylic denture teeth and auto-polymerized acrylic resin. MATERIALS AND METHODS Seventy maxillary central incisor acrylic denture teeth for each of three different brands (Yamahachi New Ace; Major Dent; Cosmo HXL) were embedded with incisal edge downwards in auto-polymerized resin in polyethylene pipes and ground with silicone carbide paper on their ridge lap surfaces. The teeth of each brand were divided into seven groups (n=10): no surface treatment (control group), MF-MA solution at a ratio of 25:75 (v/v) for 15 seconds, 30 seconds, 60 seconds, 120 seconds, 180 seconds, and MMA for 180 seconds. Auto-polymerized acrylic resin (Unifast Trad) was applied to the ground surface and polymerized in a pressure cooker. A tensile strength test was performed with a universal testing machine. Statistical analysis of the results was performed using two-way analysis of variance (ANOVA) and post-hoc Dunnett T3 test (α=.05). RESULTS The surface treatment groups had significantly higher mean tensile bond strengths compared with the control group (P.05), except for the Yamahachi New Ace MF-MA 180-second group (Pteeth with auto-polymerized acrylic resin, for both conventional and cross-linked teeth. PMID:27555897

  7. CATALYTIC HYDROGENATION OF ACRYLATE ASMMETRIC Dd(Ⅱ)—CHELATING RESINS CONTAINING AMINO ACID LIGANDS

    Wangying; WangHongzuo; 等

    1995-01-01

    The catalytic hydrogenation of palladium chelating resins containing chiral amino acid ligands based on lower crosslinked poly(chloroethyl acrylate) and some effects on the rate of hydrogenation were studied.

  8. A Study on Effect of Surface Treatments on the Shear Bond Strength between Composite Resin and Acrylic Resin Denture Teeth

    Chatterjee, Nirmalya; Gupta, Tapas K.; Banerjee, Ardhendu

    2011-01-01

    Visible light-cured composite resins have become popular in prosthetic dentistry for the replacement of fractured/debonded denture teeth, making composite denture teeth on partial denture metal frameworks, esthetic modification of denture teeth to harmonize with the characteristics of adjacent natural teeth, remodelling of worn occlusal surfaces of posterior denture teeth etc. However, the researches published on the bond strength between VLC composite resins and acrylic resin denture teeth i...

  9. Do flexible acrylic resin lingual flanges improve retention of mandibular complete dentures?

    Ahmed Elmorsy, Ayman Elmorsy; Ahmed Ibraheem, Eman Mostafa; Ela, Alaa Aboul; Fahmy, Ahmed; Nassani, Mohammad Zakaria

    2015-01-01

    Objectives: The aim of this study was to compare the retention of conventional mandibular complete dentures with that of mandibular complete dentures having lingual flanges constructed with flexible acrylic resin “Versacryl.” Materials and Methods: The study sample comprised 10 completely edentulous patients. Each patient received one maxillary complete denture and two mandibular complete dentures. One mandibular denture was made of conventional heat-cured acrylic resin and the other had its ...

  10. Silver hollow optical fibers with acrylic silicone resin coating as buffer layer for sturdy structure

    Iwai, Katsumasa; Takaku, Hiroyuki; Miyagi, Mitsunobu; Shi, Yi-Wei; Zhu, Xiao-Song; Matsuura, Yuji

    2016-03-01

    For sturdy silver hollow optical fibers, acrylic silicone resin is newly used as a buffer layer between an inner silver layer and a silica capillary. This acrylic silicone resin film prevents the glass surface from chemical and mechanical micro damages during silver plating process, which deteriorate mechanical strength of the hollow fibers. In addition, it keeps high adhesion of the silver layer with the glass surface. We discuss improvement of mechanical strength of the hollow glass fibers without deterioration of optical properties.

  11. EFFECTS OF PHENOL RESIN ADDITIVE ON DYNAMIC MECHANICAL PROPERTIES OF ACRYLATE RUBBER AND ITS BLENDS

    Chi-fei Wu

    2003-01-01

    The dynamic mechanical properties of a new blend system consisting of phenol resin and polar polymer (acrylate rubber and/or chlorinated polypropylene) were investigated. It was found that the addition of phenol resin to acrylate rubber and its incompatible blend can cause a remarkable improvement in the temperature dependence of the loss tangent. As a result, the present blends are very good damping materials.

  12. In vitro cytotoxicity of self-curing acrylic resins of different colors

    Luciana Borges Retamoso

    2014-08-01

    Full Text Available OBJECTIVE: The aim of this study was to assess the in vitro cytotoxicity of acrylic resins of different colors over time. METHODS: Specimens were divided into 4 groups (n = 6 according to the color of the acrylic resin (Orto Class, Clássico, Campinas, São Paulo, Brazil: Group 1: clear acrylic resin; group 2: pink acrylic resin; group 3: blue acrylic resin and group 4: green acrylic resin. All specimens were fabricated according to the mass manipulation technique and submitted to mechanical polishing protocol. The control was performed with an amalgam specimen (C+, a glass specimen (C- and cell control (CC. Specimens were immersed in Minimum Eagle's Medium (MEM and incubated for 24 h at 37o C. The extracts from the experimental material were filtered and mixed with L929 fibroblast. Cytotoxicity was evaluated at 4 different times, 24, 48, 72 and 168 h. After contact, cells were incubated for 24 h and added to 100 µ of 0.01% neutral red dye. The cells were incubated for 3 h for pigment incorporation and fixed. Cells viability was determined by a spectroscopic (BioTek, Winooski, Vermont, USA with a 492-nm wavelength λ=492 nm. RESULTS: There were no statistical differences between the experimental groups and the CC and C- groups. CONCLUSION: Clear, pink, blue and green self-curing acrylic resins fabricated by means of the mass manipulation technique and mechanically polished are not cytotoxic. Neither the pigment added to the self-curing acrylic resin nor the factor of time influenced the cytotoxicity of the material.

  13. Antifungal Effect of Zataria multiflora Essence on Experimentally Contaminated Acryl Resin Plates With Candida albicans

    Jafari, Abbas Ali; Falah Tafti, Abbas; Hoseiny, Seyed Mehdi; Kazemi, Abdolhossein

    2015-01-01

    Background: Adherence and colonization of Candida species particularly C. albicans on denture surfaces, forms a microbial biofilm, which may result denture stomatitis in complete denture users. Objectives: The purpose of the present study was to evaluate the antifungal effect Zataria multiflora essence in removing of Candida albicans biofilms on experimentally contaminated resin acryl plates. Materials and Methods: In the present experimental study, 160 resin acrylic plates (10 × 10 × 1 mm) w...

  14. Contact-killing of adhering streptococci by a quaternary ammonium compound incorporated in an acrylic resin

    Mei, Li; Ren, Yijin; Loontjens, Ton J. A.; van der Mei, Henny C.; Busscher, Henk J.

    2012-01-01

    Purpose: Acrylates for bonding of joint prostheses and stainless-steel brackets in orthopedics and orthodontics are prone to bacterial adhesion and biofilm formation, respectively, leading to serious infectious complications. Here we describe the preparation of a contact-killing acrylic resin by inc

  15. SYNTHESIS AND PROPERTIES OF POLYURETHANE ACRYLATE/EPOXY RESIN INTERPENETRATING POLYMER NETWORKS

    SHI Youheng; NIE Xuzong

    1988-01-01

    In this paper, a series of interpenetrating polymer networks (IPNs) based on polyurethane acrylate and epoxy resin was prepared by simultaneous photoinitiating by both free-radical and cationic polymerization.The effects of the polyurethane acrylate prepolymer's molecular weight, various components ratio and polymerization methods on IPN's dynamic mechanical and mechanical properties were investigated.

  16. Dimensional change of acrylic resin plate after the reinforcement of glass fibre

    Dwiyanti Feriana Ratwita

    2007-06-01

    Full Text Available The effect of fibre reinforcement of polymethyl methacrylate was investigated. Glass fibres have been studied as strengthening material added to polymethyl methacrylate. The purpose of this study was to evaluate dimensional change of acrylic resin plate after glass fibre reinforcement. As a research subject is an acrylic resin plate of 65 × 10 × 2.5 mm with the number of 32 samples were distributed randomly in 4 experimental groups. Each group consisted of 8 samples and control groups. Group 1: acrylic resin plate and 1 sheet glass fibre; group 2: acrylic resin plate and 2 sheet glass fibre; group 3: acrylic resin plate and 3 sheet glass fibre. Control group which was not given treatment. Dimensional change was measured by profile projector. The data was analyzed by One-Way ANOVA and LSD test showed that there was significant difference in dimensional change (p < 0.005. The conclusion suggested that dimensional change of the acrylic resin plates after glass fibre reinforcement minimally done 1 sheet glass fibre.

  17. Applications of Blue Light-curing Acrylic Resin to Forensic Sample Preparation and Microtomy.

    Groves, Ethan; Palenik, Christopher S

    2016-03-01

    This study discusses the results of an evaluation of a one-part blue light-curing acrylic resin for embedding trace evidence prior to the preparation of thin sections with a microtome. Through a comparison to several epoxy resins, the physical properties relevant to both trace evidence examination and analytical microscopy in general, including as viscosity, clarity, color, hardness, and cure speed, were explored. Finally, thin sections from paint samples embedded in this acrylic resin were evaluated to determine if, through smearing or impregnation, the resin contributed to the infrared spectra. The results of this study show that blue light-curing acrylic resins provide the desired properties of an embedding medium, generate high-quality thin sections, and can significantly simplify the preparation of paint chips, fibers and a multitude of other types of microscopic samples in the forensic trace evidence laboratory. PMID:27404623

  18. The effect of various frequencies of ultrasonic cleaner in reducing residual monomer in acrylic resin.

    Charasseangpaisarn, Taksid; Wiwatwarrapan, Chairat

    2015-12-01

    Monomer remaining in denture base acrylic can be a major problem because it may cause adverse effects on oral tissue and on the properties of the material. The purpose of this study was to compare the effect of various ultrasonic cleaner frequencies on the amount of residual monomer in acrylic resin after curing. Forty-two specimens each of Meliodent heat-polymerized acrylic resin (M) and Unifast Trad Ivory auto-polymerized acrylic resin (U) were prepared according to their manufacturer's instructions and randomly divided into seven groups: Negative control (NC); Positive control (PC); and five ultrasonic treatment groups: 28 kHz (F1), 40 kHz (F2), 60 kHz (F3) (M=10 min, U=5 min), and 28 kHz followed by 60 kHz (F4: M=5 min per frequency, U=2.5 min per frequency, and F5: M=10 min followed by 5 min per frequency, U=5 min followed by 2.5 min per frequency). Residual monomer was determined by HPLC following ISO 20795-1. The data were analyzed by One-way ANOVA and Tukey HSD. There was significantly less residual monomer in the auto-polymerized acrylic resin in all ultrasonic treatment groups and the PC group than that of the NC group (p0.05). The amount of residual monomer in heat-polymerized acrylic resin was significantly lower than that of auto-polymerized acrylic resin. In conclusion, ultrasonic treatment at low frequencies is recommended to reduce the residual monomer in auto-polymerized acrylic resin and this method is more practical in a clinical situation than previously recommended methods because of reduced chairside time. PMID:26190059

  19. Rat hindlimb joint immobilization with acrylic resin orthoses

    C.A. da Silva

    2006-07-01

    Full Text Available The objective of the present study was to propose an orthosis of light material that would be functional for the animal and that would maintain only the ankle joint immobilized. Male Wistar rats (3 to 4 months old, 250-300 g were divided into 2 groups (N = 6: control and immobilized for 7 days. Rats were anesthetized with sodium pentobarbital (40 mg/kg weight and the left hindlimb was immobilized with the orthoses composed of acrylic resin model, abdominal belt and lateral supports. The following analyses were performed: glycogen content of the soleus, extensor digitorum longus, white gastrocnemius, red gastrocnemius, and tibialis anterior muscles by the phenol sulfuric method, and the weight, fiber area and intramuscular connective tissue of the soleus by the planimetric system. Data were analyzed statistically by the Kolmogorov-Smirnov, Student t and Wilcoxon tests. Immobilization decreased glycogen in all muscles (P < 0.05; soleus: 31.6%, white gastrocnemius: 56.6%, red gastrocnemius: 39%, extensor digitorum longus: 41.7%, tibialis anterior: 45.2% in addition to reducing soleus weight by 34% (P < 0.05. Furthermore, immobilization promoted reduction of the fiber area (43%, P < 0.05 and increased the connective tissue (200%, P < 0.05. The orthosis model was efficient comparing with another alternative immobilization model, like plaster casts, in promoting skeletal muscle alterations, indicating that it could be used as a new model in other studies related to muscle disuse.

  20. Comparative evaluation of surface porosities in conventional heat polymerized acrylic resin cured by water bath and microwave energy with microwavable acrylic resin cured by microwave energy

    Sunint Singh

    2013-01-01

    Full Text Available Background: Conventional heat cure poly methyl methacrylate (PMMA is the most commonly used denture base resin despite having some short comings. Lengthy polymerization time being one of them and in order to overcome this fact microwave curing method was recommended. Unavailability of specially designed microwavable acrylic resin made it unpopular. Therefore, in this study, conventional heat cure PMMA was polymerized by microwave energy. Aim and Objectives: This study was designed to evaluate the surface porosities in PMMA cured by conventional water bath and microwave energy and compare it with microwavable acrylic resin cured by microwave energy. Materials and Methods: Wax samples were obtained by pouring molten wax into a metal mold of 25 mm × 12 mm × 3 mm dimensions. These samples were divided into three groups namely C, CM, and M. Group C denotes conventional heat cure PMMA cured by water bath method, CM denotes conventional heat cure PMMA cured by microwave energy, M denotes specially designed microwavable acrylic denture base resin cured by microwave energy. After polymerization, each sample was scanned in three pre-marked areas for surface porosities using the optical microscope. As per the literature available, this instrument is being used for the first time to measure the porosity in acrylic resin. It is a reliable method of measuring area of surface pores. Portion of the sample being scanned is displayed on the computer and with the help of software area of each pore was measured and data were analyzed. Results: Conventional heat cure PMMA samples cured by microwave energy showed maximum porosities than the samples cured by conventional water bath method and microwavable acrylic resin cured by microwave energy. Higher percentage of porosities was statistically significant, but well within the range to be clinically acceptable. Conclusion: Within the limitations of this in-vitro study, conventional heat cure PMMA can be cured by

  1. Effect of silver nanoparticles incorporation on viscoelastic properties of acrylic resin denture base material

    Mahross, Hamada Zaki; Baroudi, Kusai

    2015-01-01

    Objective: The objective was to investigate the effect of silver nanoparticles (AgNPs) incorporation on viscoelastic properties of acrylic resin denture base material. Materials and Methods: A total of 20 specimens (60 × 10 × 2 mm) of heat cured acrylic resin were constructed and divided into four groups (five for each), according to the concentration of AgNPs (1%, 2%, and 5% vol.) which incorporated into the liquid of acrylic resin material and one group without additives (control group). The dynamic viscoelastic test for the test specimens was performed using the computerized material testing system. The resulting deflection curves were analyzed by material testing software NEXYGEN MT. Results: The 5% nanoparticles of silver (NAg) had significantly highest mean storage modulus E’ and loss tangent Tan δ values followed by 2% NAg (P 0.05). Conclusion: The AgNPs incorporation within the acrylic denture base material can improve its viscoelastic properties. PMID:26038651

  2. Effect of microwave cured acrylic resin on candidal growth in complete denture

    This study was conducted to evaluate the effect of heat-cured acrylic resin denture base and microwave-cured acrylic resin denture base on candidal growth . Seven completely edentulous male patients with on history of denture wearing participated in this study. all the selected patients were re-habilitated by mucosa supported complete dentures .The dentures were constructed from conventional heat-cured acrylic resin denture base following monoplane concept of occlusion. Before dismissing the patients and one month after denture insertion, salivary samples were collected according to oral rinse technique. one month resting period was allowed so as candidal count can reach to normal, then dentures were re based using microwave-cured acrylic denture base, before denture insertion and one month after denture insertion, salivary sample were collected before and one month following the same oral rinse technique.

  3. Cytocompatible antifungal acrylic resin containing silver nanoparticles for dentures

    Acosta-Torres LS

    2012-09-01

    Full Text Available Laura Susana Acosta-Torres,1 Irasema Mendieta,2 Rosa Elvira Nuñez-Anita,3 Marcos Cajero-Juárez,3 Víctor M Castaño41National School of Higher Education, School of Dentistry - Leon Unit, National Autonomus University of Mexico (UNAM, Leon, Guanajuato, 2Neurobiology Institute, National Autonomus University of Mexico (UNAM, Juriquilla, Queretaro, 3Animal Biotechnology Laboratory, Faculty of Veterinary Medicine at San Nicolas de Hidalgo, Michoacán University, Michoacán, 4Molecular Materials Department, Applied Physics and Advanced Technology Center, National Autonomus University of Mexico (UNAM, Juriquilla, Queretaro, MexicoBackground: Inhibition of Candida albicans on denture resins could play a significant role in preventing the development of denture stomatitis. The safety of a new dental material with antifungal properties was analyzed in this work.Methods: Poly(methyl methacrylate [PMMA] discs and PMMA-silver nanoparticle discs were formulated, with the commercial acrylic resin, Nature-CrylTM, used as a control. Silver nanoparticles were synthesized and characterized by ultraviolet-visible spectroscopy, dispersive Raman spectroscopy, and transmission electron microscopy. The antifungal effect was assessed using a luminescent microbial cell viability assay. Biocompatibility tests were carried out using NIH-3T3 mouse embryonic fibroblasts and a Jurkat human lymphocyte cell line. Cells were cultured for 24 or 72 hours in the presence or absence of the polymer formulations and analyzed using three different tests, ie, cellular viability by 3-(4,5-dimethylthiazol-2-yl-2,5-diphenyltetrazolium bromide (MTT assay, and cell proliferation by enzyme-linked immunosorbent assay BrdU, and genomic DNA damage (Comet assay. Finally, the samples were evaluated mechanically, and the polymer-bearing silver nanoparticles were analyzed microscopically to evaluate dispersion of the nanoparticles.Results: The results show that PMMA-silver nanoparticle discs

  4. Effect of repeated immersion solution cycles on the color stability of denture tooth acrylic resins

    Paulo Maurício Batista da Silva

    2011-12-01

    Full Text Available OBJECTIVE: Chemical solutions have been widely used for disinfection of dentures, but their effect on color stability of denture tooth acrylic resins after repeated procedures is still unclear. The aim of this in vitro study was to evaluate whether repeated cycles of chemical disinfectants affected the color stability of two denture tooth acrylic resins. MATERIAL AND METHODS: Sixty disc-shaped specimens (40 mm x 3 mm were fabricated from two different brands (Artiplus and Trilux of denture tooth acrylic resin. The specimens from each brand (n=30 were randomly divided into 6 groups (n=5 and immersed in the following solutions: distilled water (control group and 5 disinfecting solutions (1% sodium hypochlorite, 2% sodium hypochlorite, 5.25% sodium hypochlorite, 2% glutaraldehyde, and 4% chlorhexidine gluconate. Tooth color measurements were made by spectrophotometry. Before disinfection, the initial color of each tooth was recorded. Further color measurements were determined after subjecting the specimens to 7, 21, 30, 45, 60, and 90 immersion cycles in each tested solution. Color differences (ΔE* were determined using the CIE L*a*b* color system. Data were analyzed using two-way repeated measures analysis of variance (ANOVA followed by Tukey tests. The significance level was set at 5%. RESULTS: There were statistically significant differences in ΔE* among the 5 disinfectants and water during the 90 cycles of immersion for both denture tooth acrylic resins. Distilled water promoted the greatest color change in both denture tooth acrylic resins, nevertheless none of tested disinfectants promoted ΔE* values higher than 1.0 on these acrylic materials during the 90 cycles of disinfection. CONCLUSIONS: Repeated immersion cycles in disinfecting solutions alter ΔE* values, however these values do not compromise the color of the tested denture tooth acrylic resins because they are imperceptible to the human eye.

  5. Surface morphology changes of acrylic resins during finishing and polishing phases

    Glaucio Serra

    2013-12-01

    Full Text Available INTRODUCTION: The finishing and polishing phases are essential to improve smoothness and shining on the surface of acrylic resins used to make removable orthodontic appliances. A good surface finishing reduces roughness, which facilitates hygiene, prevents staining and provides greater comfort to the patients. OBJECTIVE: The aim of this paper was to analyze the changes on surface morphology of acrylic resins during finishing and polishing phases. METHODS: Thirty discs (10 mm in diameter and 5 mm in length were made with acrylic resin and randomly divided into ten groups. The control group did not receive any treatment while the other groups received gradual finishing and polishing. The last group received the entire finishing and polishing procedures. Surface morphology was qualitatively analyzed through scanning electron microscopy and quantitatively analyzed through a laser profilometer test. RESULTS: The acrylic resin surfaces without treatment showed bubbles which were not observed in the subsequent phases. Wearing out with multilaminated burs, finishing with wood sandpaper and finishing with water sandpaper resulted in surfaces with decreasing irregularities. The surfaces that were polished with pumice and with low abrasive liquids showed high superficial smoothness. CONCLUSION: Highly smooth acrylic resin surfaces can be obtained after mechanical finishing and polishing performed with multilaminated burs, wood sandpaper, water sandpaper, pumice and low abrasive liquids.

  6. Preparation and properties of acrylic resin coating modified by functional graphene oxide

    Dong, Rui; Liu, Lili

    2016-04-01

    To improve the dispersion and the strength of filler-matrix interface in acrylic resin, the functional graphene oxide (FGO) was obtained by surface modification of graphene oxide (GO) by γ-methacryloxypropyl trimethoxysilane (KH-570) and then the acrylic nanocomposites containing different loadings of GO and FGO were prepared. The structure, morphology and dispersion/exfoliation of the FGO were characterized by XRD, FT-IR, Raman, XPS, SEM and TEM. The results demonstrated that the KH-570 was successfully grafted onto the surface of GO sheets. Furthermore, the corresponding thermal, mechanical and chemical resistance properties of the acrylic nanocomposites filled with the FGO were studied and compared with those of neat acrylic and GO/acrylic nanocomposites. The results revealed that the loading of FGO effectively enhanced various properties of acrylic resin. These findings confirmed that the dispersion and interfacial interaction were greatly improved by incorporation of FGO, which might be the result of covalent bonds between the FGO and the acrylic matrix. This work demonstrates an in situ polymerization method to construct a flexible interphase structure, strong interfacial interaction and good dispersion of FGO in acrylic nanocomposites, which can reinforce the polymer properties and be applied in research and industrial areas.

  7. Assessment of the flexural strength of two heat-curing acrylic resins for artificial eyes.

    Fernandes, Aline Ursula Rocha; Portugal, Aline; Veloso, Letícia Rocha; Goiato, Marcelo Coelho; Santos, Daniela Micheline dos

    2009-01-01

    Prosthetic eyes are artificial substitutes for the eyeball, made of heat-curing acrylic resin, serving to improve the esthetic appearance of the mutilated patient and his/her inclusion in society. The aim of this study was to assess the flexural strength of two heat-curing acrylic resins used for manufacturing prosthetic eyes. Thirty-six specimens measuring 64 x 10 x 3.3 mm were obtained and divided into four groups: acrylic resin for artificial sclera N1 (Artigos Odontológicos Clássico, São Paulo, SP, Brazil), heat-cure water technique (GI) and microwave-cured (GII); colorless acrylic resin for prosthetic eyes (Artigos Odontológicos Clássico, São Paulo, SP, Brazil), heat-cure water technique (GIII) and microwave-cured (GIV). Mechanical tests using three point loads were performed in a test machine (EMIC, São José dos Pinhais, PR, Brazil). The analysis of variance and the Tukey test were used to identify significant differences (p < 0.01). Groups GII and GIV presented, respectively, the highest (98.70 +/- 11.90 MPa) and lowest means (71.07 +/- 8.93 MPa), with a statistically significant difference. The cure method used for the prosthetic eye resins did not interfere in their flexural strength. It was concluded that all the resins assessed presented sufficient flexural strength values to be recommended for the manufacture of prosthetic eyes. PMID:19893960

  8. Surface coating of jeungjing wood (Paraserianthes Falcataria (L) NIELSEN) with acrylate resins by using radiation technique

    An experiment on surface coating with acrylate resins has been done by using radiation technique to improve the quality and added value of jeunjing wood (Paraserianthes Falcataria (L) NIELSEN). Doses used in Electron Beam (BE) radiation were 20, 40, and 60 kGy. Epoxy acrylate and ester acrylate resins were used as coating materials after added with tripropylene glycol diacylate (TPGDA) monomer, 2,2-dimethyl-2hidroxy acetophenone (Darocur 1173) photoinitiator and talc as base coat. Top coat consists of este acrylate Setacure AM 548, after added with titanium dioxide OK 412 as additive respectively. Titanium dioxides in the mixture were varied at the concentration level of 0, 2, 4 and 6 % by weight. Conventional coating as comparison was carried out by using varnish as coating material. The results showed that the properties of film on jeunjing wood by EB curing are better than that of conventional one. (authors)

  9. Effect of Amylase, Papaein and Pepsin enzyme solutions on Candida biofilm formed on acrylic resin plates

    A Jafari Nodoushan; A Fallah Tafti; Emami, P; H Ashoori

    2013-01-01

    Abstract:     Background and Aim: Denture stomatitis results from colonization of oral Candida on the surface of denture acrylic base. To control this infection,Candida biofilm formation must be prevented using mechanical and chemical decontamination. The purpose of the present study was to evaluate the effect of Amylase, Papaein and Pepsin solutions on removal of Candida Albicans plaques formed on acrylic resin plates.   Materials and Methods : In this experimental study Candida biofilm was ...

  10. Effect of Amylase, Papaein and Pepsin enzyme solutions on Candida biofilm formed on acrylic resin plates

    AA jafari_nodoushan; FalahTafti A; Emmami P; Ashouri

    2013-01-01

    Background and Aim: Denture stomatitis results from colonization of oral Candida on the surface of denture acrylic base. To control this infection,Candida biofilm formation must be prevented using mechanical and chemical decontamination. The purpose of the present study was to evaluate the effect of Amylase, Papaein and Pepsin solutions on removal of Candida Albicans plaques formed on acrylic resin plates. Materials and Methods: In this experimental study Candida biofilm was formed on 220 ...

  11. The development of palm oil based acrylated resins and their applications

    Since Malaysia provides 57 and 75% of the world's production and exports of palm oil respectively, it is natural that we should be in the forefront of the research of widening the use of palm oil in oleochemicals industry, which are currently increase in popularity. The presence of unsaturation in the fatty acids of vegetable oils such as palm oil, technically paves the way for the production of acrylated resins. The more unsaturated the oil, the better it will perform in the radiation curing related applications. The first acrylated palm oil was synthesised in early 1989, through acrylation process, whereby, acrylic acid is introduced into oxirane group of the epoxidised palm oil products, EPOP, at 100-130 deg C in the presence of triethylamine, TEA, as a catalyst and 4-methoxyphenol as an inhibitor. The acrylated products namely epoxidised palm oil (olein) acrylate, EPOLA/EPOPA, was found curable when subjected to UV or EB irradiations. The EPOLA based formulated resins were satisfactorily been used as radiation curable coating materials on various substrates such as woods, bamboos, glass, ceramics and metals without any major defects at reasonably fast cure rate. Preliminary investigations also revealed their potentials as radiation curable pressure sensitive adhesives and printing inks. Isocyanation of EPOLAs at 50 to 90deg C with the presence of 1% inhibitor such as 4-methoxyphenol resulted in resins called Palm oil based urethane acrylates, POBUA. This newly synthesised resins possess certain advantages over EPOLA such as higher molecular weight, better crosslinking density, abrasion resistance, tensile properties and also pendulum hardness. Early results might suggest that POBUA is in a better position to be used as resins for radiation curing of surface coating applications

  12. Bond strength of acrylic teeth to denture base resin after various surface conditioning methods before and after thermocycling

    Saavedra, Guilherme; Valandro, Luz Felipe; Leite, Fabiola Pessoa; Amaral, Regina; Oezcan, Mutlu; Bottino, Marco A.; Kimpara, Estevao T.

    2007-01-01

    This study aimed to evaluate the durability of adhesion between acrylic teeth and denture base acrylic resin. The base surfaces of 24 acrylic teeth were flatted and submitted to 4 surface treatment methods: SM1 (control): No SM; SM2: application of a methyl methacrylate-based bonding agent (Vitacol)

  13. Adsorption of surfactants onto acrylic ester resins with different pore size distribution

    YANG Weiben; LI Aimin; CAI Jianguo; MENG Guanhua; ZHANG Quanxing

    2006-01-01

    In this study, a series of acrylic ester resins with different pore size distribution were prepared successfully by varying the type and the amount of pore-forming agents. In order to investigate the adsorption behavior and mechanism of surfactants on acrylic ester resins, three kinds of surfactants were utilized as adsorbates that were sodium 6-dodecyl benzenesulfonate (6-NaDBS),sodium 1-dodecyl benzene sulfonate (1-NaDBS) and sodium 1-dodecyl sulfonate, respectively. It was observed that the surface area was available in a particular pore size and an appropriate pore size of resins appeared to be more important for the adsorption of surfactants. As compared to commercial acrylic ester resins XAD-7 and HP2MG, 50# and 38# resins exhibited more excellent adsorption properties toward 1-NaDBS and 6-NaDBS. The experimental equilibrium data were fitted to the Langmuir, and double-Langmuir models. Two models provided very good fittings for all resins over the temperature range studied. The investigation dicated that electrostatic attraction and hydrogen bond between resins and surfactants were the main forces and had an obvious effect on adsorption process.

  14. Evaluation of thermal conductivity of heat-cured acrylic resin mixed with A1203

    Ebadian B.

    2002-08-01

    Full Text Available One of the most important characteristics of denture base is thermal conductivity. This property has a major role in secretions of salivary glands and their enzymes, taste of the food and gustatory response. Polymethyl methacrylate used in prosthodontics is relatively an insulator. Different materials such as metal fillers and ceramics have been used to solve this problem. The aim of this study was the evaluation of AI2O3 effect on thermal conductivity of heat-cured acrylic resin. Acrylic resin was mixed with AI2O3 in two different weight rates (15 and 20 % of weight. So, group 1 and 2 were divided on this basis. Samples with pure acrylic resin were considered as control group. 18 cylindrical patterns were made in 9x9 mm dimensions and thermocouple wires embedded in each sample to act as conductor. The specimens were put in water with 70±1°C thermal range for 10 minutes. Then, thermal conductivity was measured. The results were analyzed with variance analysis and Dunken test. There was significant difference between thermal conductivity of all groups in all period times. It the first seconds, thermal conductivity in groups 1 and 2 were more than control group. Therefore, for developing of thermal conductivity of acrylic resin, A1203 can be used. Certainly, other characteristic of new resin should be evaluated.

  15. Development of palm oil-based UV-curable epoxy acrylate and urethane acrylate resins for wood coating application

    Full-text: The trend of using renewable sources such as palm oil as raw material in radiation curing is growing due to the demand from the market to produce a more environmental friendly product. In this study, the radiation curable process was done using epoxy acrylate and urethane acrylate resins which are known as epoxidized palm olein acrylate (EPOLA) and palm oil based urethane acrylate (POBUA), respectively. The purpose of the study was to investigate curing properties and the application of this UV-curable palm oil resins for wood coating. Furthermore, the properties of palm oil based coatings are compared with the petrochemical-based compound such as ebecryl (EB) for example EB264 and EB830. From the experiment done, the resins from petrochemical-based compounds resulted higher degree of crosslinking (up to 80 %) than the palm oil based compounds (up to 70 %), where the different is around 10-15 %. The hardness property from this two type coatings can reached until 50 % at the lower percentage of the oligomer. However, the coatings from petrochemical-based have a high scratch resistance as it can withstand at least up to 3.0 Newton's (N) compared to the palm oil-based compounds which are difficult to withstand the load up to 1.0 N. Finally, the test on the rubber wood substrate showed that the coatings containing benzophenone photo initiator give higher adhesion property and their also showed a higher glossiness property on the glass substrate compared to the coatings containing irgacure-819 photo initiator. This study showed that the palm oil coatings can be a suitable for the replacement of petrochemicals compound for wood coating. The palm oil coatings can be more competitive in the market if the problems of using high percentage palm oil oligomer can be overcome as the palm oil price is cheap enough. (author)

  16. Development of palm oil-based UV-curable epoxy acrylate and urethane acrylate resins for wood coating application

    The trend of using renewable sources such as palm oil as raw material in radiation curing is growing due to the demand from the market to produce a more environmental friendly product. In this study, the radiation curable process was done using epoxy acrylate and urethane acrylate resins which are known as epoxidised palm olein acrylate (EPOLA) and palm oil based urethane acrylate (POBUA), respectively. The purpose of the study was to investigate curing properties and the application of this UV-curable palm oil resins for wood coating. Furthermore, the properties of palm oil based coatings are compared with the petrochemical-based compound such as ebecryl (EB) i.e. EB264 and EB830. From the experiment done, the resins from petrochemical-based compounds resulted higher degree of crosslinking (up to 80%) than the palm oil based compounds (up to 70%), where the different is around 10-15%. The hardness property from this two type coatings can reached until 50% at the lower percentage of the oligomer. However, the coatings from petrochemical-based have a high scratch resistance as it can withstand at least up to 3.0 Newtons (N) compared to the palm oil-based compounds which are difficult to withstand the load up to 1.0 N. Finally, the test on the rubber wood substrate showed that the coatings containing benzophenone photoinitiator give higher adhesion property and their also showed a higher glosiness property on the glass substrate compared to the coatings containing irgacure-819 photoinitiator. This study showed that the palm oil coatings can be a suitable for the replacement of petrochemicals compound for wood coating. The palm oil coatings can be more competitive in the market if the problems of using high percentage palm oil oligomer can be overcome as the palm oil price is cheap enough

  17. Development of palm oil-based UV-curable epoxy acrylate and urethane acrylate resins for wood coating application

    Tajau, Rida; Mahmood, Mohd Hilmi; Salleh, Mek Zah; Salleh, Nik Ghazali Nik [Radiation Processing Technology Division, Malaysian Nuclear Agency (Nuclear Malaysia), Bangi, 43000 Kajang, Selangor (Malaysia); Ibrahim, Mohammad Izzat [Faculty of Science, University of Malaya (UM), 50603 Kuala Lumpur (Malaysia); Yunus, Nurulhuda Mohd [Faculty of Science and Technology, National University Malaysia (UKM), 43600 Bangi, Selangor (Malaysia)

    2014-02-12

    The trend of using renewable sources such as palm oil as raw material in radiation curing is growing due to the demand from the market to produce a more environmental friendly product. In this study, the radiation curable process was done using epoxy acrylate and urethane acrylate resins which are known as epoxidised palm olein acrylate (EPOLA) and palm oil based urethane acrylate (POBUA), respectively. The purpose of the study was to investigate curing properties and the application of this UV-curable palm oil resins for wood coating. Furthermore, the properties of palm oil based coatings are compared with the petrochemical-based compound such as ebecryl (EB) i.e. EB264 and EB830. From the experiment done, the resins from petrochemical-based compounds resulted higher degree of crosslinking (up to 80%) than the palm oil based compounds (up to 70%), where the different is around 10-15%. The hardness property from this two type coatings can reached until 50% at the lower percentage of the oligomer. However, the coatings from petrochemical-based have a high scratch resistance as it can withstand at least up to 3.0 Newtons (N) compared to the palm oil-based compounds which are difficult to withstand the load up to 1.0 N. Finally, the test on the rubber wood substrate showed that the coatings containing benzophenone photoinitiator give higher adhesion property and their also showed a higher glosiness property on the glass substrate compared to the coatings containing irgacure-819 photoinitiator. This study showed that the palm oil coatings can be a suitable for the replacement of petrochemicals compound for wood coating. The palm oil coatings can be more competitive in the market if the problems of using high percentage palm oil oligomer can be overcome as the palm oil price is cheap enough.

  18. Development of palm oil-based UV-curable epoxy acrylate and urethane acrylate resins for wood coating application

    Tajau, Rida; Ibrahim, Mohammad Izzat; Yunus, Nurulhuda Mohd; Mahmood, Mohd Hilmi; Salleh, Mek Zah; Salleh, Nik Ghazali Nik

    2014-02-01

    The trend of using renewable sources such as palm oil as raw material in radiation curing is growing due to the demand from the market to produce a more environmental friendly product. In this study, the radiation curable process was done using epoxy acrylate and urethane acrylate resins which are known as epoxidised palm olein acrylate (EPOLA) and palm oil based urethane acrylate (POBUA), respectively. The purpose of the study was to investigate curing properties and the application of this UV-curable palm oil resins for wood coating. Furthermore, the properties of palm oil based coatings are compared with the petrochemical-based compound such as ebecryl (EB) i.e. EB264 and EB830. From the experiment done, the resins from petrochemical-based compounds resulted higher degree of crosslinking (up to 80%) than the palm oil based compounds (up to 70%), where the different is around 10-15%. The hardness property from this two type coatings can reached until 50% at the lower percentage of the oligomer. However, the coatings from petrochemical-based have a high scratch resistance as it can withstand at least up to 3.0 Newtons (N) compared to the palm oil-based compounds which are difficult to withstand the load up to 1.0 N. Finally, the test on the rubber wood substrate showed that the coatings containing benzophenone photoinitiator give higher adhesion property and their also showed a higher glosiness property on the glass substrate compared to the coatings containing irgacure-819 photoinitiator. This study showed that the palm oil coatings can be a suitable for the replacement of petrochemicals compound for wood coating. The palm oil coatings can be more competitive in the market if the problems of using high percentage palm oil oligomer can be overcome as the palm oil price is cheap enough.

  19. The adsorption of an epoxy acrylate resin on aluminium alloy conversion coatings

    Grilli, R; Abel, ML; Baker, MA; Dunn, B.; Watts, JF

    2011-01-01

    A thermodynamic study of the adsorption of an epoxy acrylate resin used for UV-cured coatings on two different anticorrosion pretreatments on aluminium alloys relevant to aerospace industry has been undertaken. Aluminium alloy Al2219 specimens, treated with an inorganic chromate based conversion coating (Alodine 1200S) and an organic titanium based conversion coating (Nabutan STI/310), were immersed in solutions of different concentrations of the resin and adsorption isotherms were determined...

  20. Perubahan suhu transisi kaca dan massa resin akrilik heat cured akibat kelembaban dan lama penyimpanan (Changes in glass transition temperature and heat cured acrylic resin mass due to moisture and storage time)

    Sherman Salim

    2014-01-01

    Background: Acrylic resins, especially poly methyl methacrylate (PMMA) was introduced in 1937. Acrylic resin has favorable properties, among others, aesthetic, color and texture similar to that of the gingival aesthetic in the mouth, relatively low water absorption and dimensional changes. However, some studies suggest that the duration of storage of acrylic resin will affect the changes in the glass transition temperature and the mass of acrylic resin. Purpose: The objective of this research...

  1. Kekuatan transversa resin akrilik hybrid setelah penambahan glass fiber dengan metode berbeda (The transverse strength of the hybrid acrylic resin after glass fiber reinforcement with different method

    Intan Nirwana

    2006-03-01

    Full Text Available Different types of fibers have been added to acrylic resin materials to improve their mechanical properties. The purpose of this study was to know the transverse strength of the hybrid acrylic resins after glass fiber reinforcement with difference method. This study used rectangular specimens of 65 mm in length, 10 mm in width and 2.5 mm in thickness. There were 3 groups consisting of 6 specimens each, hybrid acrylic resin without glass fiber (control, glass fibers dipped in methyl methacrylate monomer for 15 minutes before being reinforced into hybrid acrylic resin (first method, glass fibers reinforced into a mixture of polymer powder and monomer liquid after the hybrid acrylic resin was mixed directly (second method. All of the specimens were cured for 20 minutes at 100° C. Transverse strength was measured using Autograph. The statistical analyses using one way ANOVA and LSD test showed that there were significant differences in transverse strength (p < 0.05 among the groups. The means of transverse strength were 94,94; 118,27; and 116,34 MPa. It meant that glass fibers reinforcement into hybrid acrylic resin enhanced their transverse strength compared with control. Glass fiber reinforcement into hybrid acrylic resin with differenciate method didn’t enhance their transverse strength.

  2. Effect of Nanoclay on Thermal Conductivity and Flexural Strength of Polymethyl Methacrylate Acrylic Resin

    Tahereh Ghaffari

    2016-06-01

    Full Text Available Statement of the Problem: The mechanical and thermal properties of polymethyl methacrylate (PMMA acrylic resin should be improved to counterweigh its structural deficiencies. Purpose: The aim of this study was to compare the flexural strength and thermal conductivity of conventional acrylic resin and acrylic resin loaded with nanoclay. Materials and Method: The methacrylate monomer containing the 0.5, 1 and 2 wt% of nanoclay was placed in an ultrasonic probe and mixed with the PMMA powder. Scanning electron microscopy was used to verify homogeneous distribution of particles. Twenty-four 20×20×200-mm cubic samples were prepared for flexural strength test; 18 samples containing nanoclay and 6 samples for the control group. Another 24 cylindrical samples of 38×25 mm were prepared for thermal conductivity test. One-way ANOVA was used for statistical analysis, followed by multiple-comparison test (Scheffé’s test. Statistical significance was set at p< 0.05. Results: Increasing the concentration of nanoclay incorporated into the acrylic resin samples increased thermal conductivity but decreased flexural strength (p< 0.05. Conclusion: Based on the results of this study, adding nanoclay particles to PMMA improved its thermal conductivity, while it had a negative effect on the flexural strength.

  3. [MORPHOLOGICAL FEATURES OF RAT MUCOUS MEMBRANE OF THE TONGUE EARLY AFFECTED BY ACRYLIC RESIN MONOMER].

    Davydenko, V; Nidzelskiy, M; Starchenko, I; Davydenko, A; Kuznetsov, V

    2016-03-01

    Base materials, made on the basis of various derivatives of acrylic and methacrylic acids, have been widely used in prosthetic dentistry. Free monomer, affecting the tissues of prosthetic bed and the whole body, is always found in dentures. Therefore, study of the effect of acrylic resins' monomer on mucous membrane of the tongue is crucial. Rat tongue is very similar to human tongue, and this fact has become the basis for selecting these animals to be involved into the experiment. The paper presents the findings related to the effect of "Ftoraks" base acrylic resin monomer on the state of rat mucous membrane of the tongue and its regeneration. The microscopy has found that the greatest changes in the mucous membrane of the tongue occur on day 3 and 7 day after applying the monomer and are of erosive and inflammatory nature. Regeneration of tongue epithelium slows down. PMID:27119844

  4. Evaluation of shrinkage polymerization and temperature of different acrylic resins used to splinting transfer copings in indirect impression technique

    Franco, Ana Paula G. O.; Karam, Leandro Z.; Galvão, José R.; Kalinowski, Hypolito J.

    2015-09-01

    The aim of the present study was evaluate the shrinkage polymerization and temperature of different acrylic resins used to splinting transfer copings in indirect impression technique. Two implants were placed in an artificial bone, with the two transfer copings joined with dental floss and acrylic resins; two dental resins are used. Measurements of deformation and temperature were performed with Fiber Braggs grating sensor for 17 minutes. The results revealed that one type of resin shows greater values of polymerization shrinkage than the other. Pattern resins did not present lower values of shrinkage, as usually reported by the manufacturer.

  5. Adsorption of uranium ions by crosslinked polyester resin functionalized with acrylic acid from aqueous solutions

    In this paper, the crosslinked polyester resin containing acrylic acid functional groups was used for the adsorption of uranium ions from aqueous solutions. For this purpose, the crosslinked polyester resin of unsaturated polyester in styrene monomer (Polipol 353, Poliya) and acrylic acid as weight percentage at 80 and 20%, respectively was synthesized by using methyl ethyl ketone peroxide (MEKp, Butanox M60, Azo Nobel)-cobalt octoate initiator system. The adsorption of uranium ions on the sample (0.05 g copolymer and 5 mL of U(VI) solution were mixed) of the crosslinked polyester resin functionalized with acrylic acid was carried out in a batch reactor. The effects of adsorption parameters of the contact time, temperature, pH of solution and initial uranium(VI) concentration for U(VI) adsorption on the crosslinked polyester resin functionalized with acrylic acid were investigated. The adsorption data obtained from experimental results depending on the initial U(VI) concentration were analyzed by the Freundlich, Langmuir and Dubinin-Radushkevich (D-R) adsorption isotherms. The adsorption capacity and free energy change were determined by using D-R isotherm. The obtained experimental adsorption data depending on temperature were evaluated to calculate the thermodynamic parameters of enthalpy (ΔHo), entropy (ΔSo) and free energy change (ΔGo) for the U(VI) adsorption on the crosslinked polyester resin functionalized with acrylic acid from aqueous solutions. The obtained adsorption data depending on contact time were analyzed by using adsorption models such as the modified Freundlich, Elovich, pseudo-first order and pseudo-second-order kinetic models. (author)

  6. CURING KINETICS AND PROPERTIES OF ACRYLIC RESIN CURED WITH AZIRIDINE CROSSLINKER

    Fei Xie; Zong-hui Liu; De-qing Wei

    2002-01-01

    A kind of aziridine crosslinkers was synthesized and used to crosslink acrylate copolymers. The crosslinking properties and curing kinetics of the resin were studied. It was found that with the increase of the content of crosslinker in the emulsion, the mechanical properties and solvent resistance of the resin will be apparently improved, but its glass transition temperature (Tg) is very low. The lowest amount of crosslinker used in the acrylic resin emulsion is 0.25%. Curing kinetics studied by DSC show that this curing reaction occurs readily because the apparent activation energy of the reaction is low(65.1 KJ/mol). These results demonstrate that the aziridine crosslinker is indeed a low temperature crosslinking agent and can be used at room temperature.

  7. Epoxy and acrylate stereolithography resins: In-situ measurements of cure shrinkage and stress relaxation

    Guess, T.R.; Chambers, R.S.; Hinnerichs, T.D.; McCarty, G.D.; Shagam, R.N.

    1995-03-01

    Cross-sections of resin strands. Techniques were developed to make in situ measurements of gelled resin to determine linear shrinkage, stress-strain response and stress relaxation of single strands of SL 5170 epoxy and SL 5149 photocurable resins. Epoxy strands shrank approximately 1.4% and the acrylate strands about 1.0% after a single exposure. No forces were measured during cure shrinkage of strands following the first laser exposure. In multiple laser exposures, the acrylate continues to shrink; whereas (University of Dayton data) no additional shrinkage is observed in epoxy strands on a second hit. In force relaxation tests, a strand is drawn and then a 0.5% step strain is applied after different elapsed times. The epoxy initial modulus evolves (increases) with elapsed time following draw of the strand, and this evolution in modulus occurs after linear shrinkage has stopped. On the other hand, acrylates show no evolution of modulus with elapsed time following a single laser draw; i.e., once shrinkage stops after one laser hit, the initial modulus remains stable with elapsed time. Finally, relaxation response times of epoxy strands get larger with increasing elapsed time after laser draw. In acrylate strands there was no evolution in initial modulus with elapsed time after a single draw so relaxation times are not a function of elapsed time after a single hit with the laser.

  8. Effect of Microwave Cured Acrylic Resin on Candidal Growth in Complete denture

    This study was conducted to evaluate the effect of heat-cured acrylic resin denture base and microwave-cured acrylic resin denture base on Candidal growth. Seven completely edentulous male patients with no history of denture wearing participated in this study. All the selected patients were re-habilitated by mucosa supported complete dentures. The dentures were constructed from conventional heat-cured acrylic resin denture base following monoplane concept of occlusion. Before dismissing the patients and one month after denture insertion, salivary samples were collected according to oral rinse technique. One month resting period was allowed so as Candidal count can reach to normal. Then dentures were re based using microwave-cured acrylic denture base, before denture insertion and one month after denture insertion, salivary sample were collected before and one month following the same oral rinse technique. In the oral rinse technique, the patients were instructed to rinse their mouths with 10 mL of sterile phosphate buffered saline for 60 seconds. The rinse was then expectorated into a universal container and immediately transported to the laboratory for concentration by centrifugation, then cultured on sabouraud's dextrose agar plates which were incubated at 37 degree C for 48 hours. Microscopic examination and germ tube test were carried out for laboratory investigations. In addition, the morphological features of the isolated Candida from the samples tested in this study, were investigated using the scanning electron microscope(SEM)

  9. Effect of Beverages on the Hardness and Tensile Bond Strength of Temporary Acrylic Soft Liners to Acrylic Resin Denture Base

    Safari A.

    2013-12-01

    Full Text Available Statement of Problem: Two potential problems commonly identified with a denture base incorporating a resilient liner are failure of the bond between acrylic resin and soft liner material, and loss of resiliency of the soft liner over time. Since patients may drink different beverages, it is important to evaluate their effects on physical properties of soft lining materials.Purpose: The objective of this in vitro study was to evaluate the effect of different beverages on the hardness of two temporary acrylic-based soft lining materials and their bond strength to the denture base resin.Materials and Method: For the hardness test; a total of 80 rectangular specimens (40mm×10mm×3mm were fabricated from a heat-polymerized polymethylmethacrylate. Two commercially auto-polymerized acrylic resin-based resilient liners; Coe-Soft and Visco-gel were prepared according to the manufacturers’ instructions and applied on the specimens. For the tensile test, 160 cylindrical specimens (30mm×10mm were prepared. The liners were added between specimens with a thickness of 3 mm. The specimens of both soft liners were divided into 4 groups (n=10 and immersed in distilled water as the control group, Coca-Cola, 8% and 50% ethanol. All groups were stored in separate containers at 37oC for 12 days. All beverages were changed daily. The hardness was determined using a Shore A durometer and tensile bond strength was determined in a ZwickRoell testing machine at a cross-head speed of 5mm/min. The results were analyzed using two-way ANOVA.Results: There was no significant interaction between the soft liners and the drinks for both hardness (p= 0.748 and bond strength (p= 0.902. There were statistically signifi-cant differences between all drinks for both hardness (p< 0.001 and bond strength (p< 0.05.Conclusion: Within the limitations of this study, it seems that drinking Coca-Cola and alcoholic beverages would not be potentially causing any problems for the temporary

  10. Perubahan warna lempeng resin akrilik yang direndam dalam larutan desinfektan sodium hipoklorit dan klorhexidin (The color changes of acrylic resins denture base material which are immersed in Sodium hypochlorite and chlorhexidine)

    David David; Elly Munadziroh

    2006-01-01

    One of the acrylic resins properties is the water absorption including color fluids and chemically fluids that affect on the color changes of the acrylic resins. This laboratory experiments studied sodium hypochlorite and chlorhexidine effect on the color changes of acrylic denture base resins material. The study was conducted by immersing heat cured acrylic plate samples of 26 mm of diameter and 0.4 mm of thickness in sodium hypochlorite for 10; 70 and 140 minutes and chlorhexidine for 15; 1...

  11. Effect of different solutions on color stability of acrylic resin-based dentures

    Marcelo Coelho Goiato

    2014-01-01

    Full Text Available The aim of this study was to evaluate the effect of thermocycling and immersion in mouthwash or beverage solutions on the color stability of four different acrylic resin-based dentures (Onda Cryl, OC; QC20, QC; Classico, CL; and Lucitone, LU. The factors evaluated were type of acrylic resin, immersion time, and solution (mouthwash or beverage. A total of 224 denture samples were fabricated. For each type of resin, eight samples were immersed in mouthwashes (Plax-Colgate, PC; Listerine, LI; and Oral-B, OB, beverages (coffee, CP; cola, C; and wine, W, and artificial saliva (AS; control. The color change (DE was evaluated before (baseline and after thermocycling (T1, and after immersion in solution for 1 h (T2, 3 h (T3, 24 h (T4, 48 h (T5, and 96 h (T6. The CIE Lab system was used to determine the color changes. The thermocycling test was performed for 5000 cycles. Data were submitted to three-way repeated-measures analysis of variance and Tukey's test (p < 0.05. When the samples were immersed in each mouthwash, all assessed factors, associated or not, significantly influenced the color change values, except there was no association between the mouthwash and acrylic resin. Similarly, when the samples were immersed in each beverage, all studied factors influenced the color change values. In general, regardless of the solution, LU exhibited the greatest DE values in the period from T1 to T5; and QC presented the greatest DE values at T6. Thus, thermocycling and immersion in the various solutions influenced the color stability of acrylic resins and QC showed the greatest color alteration.

  12. The effectiveness of Nigella sativa seed extract in inhibiting Candida albicans on heat cured acrylic resin

    Hanoem EH

    2011-09-01

    Full Text Available Background: Indonesia has a variety of plants that can be used for medicines. One of the medicinal plants is Nigella sativa. Nigella sativa has been used for medicinal purposes, both as medicinal herb and as medicinal oil. It contains saponin and atsiri oils that have antifungal, antimicrobial and antibacterial effects. Nigella sativa has been suggested as denture cleansers since it can inhibit the growth of Candida albicans (C. albicans on heat cured acrylic resin. Purpose: The aim of this research is to know the effectiveness of Nigella sativa seed extract in inhibiting the growth of C. albicans on heat cured acrylic resin. Methods: Eighteen acrylic samples were divided into three groups. Group I was control group, only contaminated with C. albicans without immersing in any solution. Group II was acrylic sample immersed in sterile aquades for one hour. Group III was acrylic sample immersed in Nigella sativa seed extract for one hour. Results: There were significant differences of C. albicans (p < 0.05 among the three groups. The number of Candida albicans was significantly higher in Group I, while that in group II was lower than that in group I, and that in group III was the lowest. Conclusion: Nigella sativa seed extract was effective in inhibiting the growth of C. albicans on heat cured acrylic resin.Latar belakang: Indonesia memiliki berbagai tanaman yang dapat dipakai sebagai obat, salah satu tanaman tersebut adalah jinten hitam (Nigella sativa. Pada beberapa negara jinten hitam telah digunakan untuk berbagai tujuan, baik sebagai obat herbal maupun sebagai minyak. kandungan jinten hitam adalah saponin dan minyak atsiri yang mempunyai efek anti jamur dan anti mikroba. Jinten hitam disarankan sebagai pilihan pembersih gigi tiruan yang dapat menghambat pertumbuhan Candida albicans (C. albicans pada resin akrilik heat cured. Tujuan: Tujuan penelitian ini adalah mengetahui efektivitas dari ekstrak biji jinten hitam dalam menghambat pertumbuhan

  13. SYNTHESIS OF 2—HYDROXYETHYL ACRYLATE BY USING STRONG ACIDIC CATION ION EXCHANGE RESIN AS CATALYST

    GAODabin

    1992-01-01

    2-Hydroxyethyl acrylate is synthesized from acrylic acid and ethylene glycol under a simple and mild condition by using strong acidic cation ion exchange resin as a catalyst,which could be recycled as long as 10 times with high activation.

  14. Synthesis of hemicellulose-acrylic acid graft copolymer super water absorbent resin by ultrasonic irradiation technology

    Liu, Fangfang; Conghui DU; Linya ZHANG

    2015-01-01

    The hemicellulose super water absorbent resin is prepared by using ultrasonic irradiation technology, with the waste liquid produced during the preparation of viscose fiber which contains a large amount of hemicellulose as raw material, acrylic acid as graft monomer, N,N’-methylene bis acrylamide (NMBA) as cross linking agent, and (NH4)2S2O8-NaHSO3 as the redox initiation system. The synthesis conditions, structure and water absorption ability of resin are discussed. The results indicate that...

  15. Applications of Acrylate-based Polymer and Silicone Resin on LPFG-based Devices

    2002-01-01

    Both acrylate-based polymer and silicone resin are proposed as recoating materials surrounding LPFGs for purposes of different applications. For the LPFG recoated with a thin layer of acrylate-based polymer, the range of wavelength shift as much as 60nm is expected when temperature changes from 0~100℃. As for that with surrounding material of silicone resin, the temperature stability is greatly improved depicted as the maximum wavelength shift of about 0.6nm with the same temperature variation. The former is potentially a broadband tunable band rejection filter or temperature sensor with enhanced sensitivity. And the latter could be applied as temperature insensitive filter, demultiplexer or strain sensor.

  16. Influence of ozone and paracetic acid disinfection on adhesion of resilient liners to acrylic resin

    2016-01-01

    PURPOSE The aim of this study was to evaluate the effect of paracetic acid (PAA) and ozone disinfection on the tensile bond strength (TBS) of silicone-based resilient liners to acrylic resins. MATERIALS AND METHODS One hundred and twenty dumbbell shaped heat-polymerized acrylic resins were prepared. From the mid segment of the specimens, 3 mm of acrylic were grinded off and separated parts were reattached by resilient liners. The specimens were divided into 2 control (control1, control7) and 4 test groups of PAA and ozone disinfection (PAA1, PAA7, ozone1 and ozone7; n=10). While control groups were immersed in distilled water for 10 min (control1) and 7 days (control7), test groups were subjected to PAA (16 g/L) or ozone rich water (4 mg/L) for 1 cycle (10 min for PAA and 60 min for ozone) per day for 7 days prior to tensile tests. Measurements of the TBS were analyzed using 3-way ANOVA and Tukey's HSD test. RESULTS Adhesive strength of Mollosil decreased significantly by application of ozone disinfection. PAA disinfection had no negative effect on the TBS values of Mollosil and Molloplast B to acrylic resin. Single application of ozone disinfection did not have any negative effect on TBS values of Molloplast B, but prolonged exposure to ozone decreased its adhesive strength. CONCLUSION The adhesion of resilient liners to acrylic was not adversely affected by PAA disinfection. Immersion in ozonated water significantly decreased TBS of Mollosil. Prolonged exposure to ozone negatively affects adhesion of Molloplast B to denture base materials. PMID:27555898

  17. The transversal strength of acrylic resin plate after being immersed soaking in noni fruit (Morinda citrifolia Linn. juice

    Sri Redjeki Indiani

    2008-06-01

    Full Text Available The disadvantages of acrylic resin plate are liquid absorption and porosity, allowing microorganisms to grow and multiply resulting in inflammation in the oral cavity. The juice of the noni fruit (Morinda citrifolia Linn. contains active flavonoid and atsiri oil. Flavonoid is a phenol substance that degrades acrylic resin plate in prolonged contact. The purpose of this study was to examine the transversal strength of acrylic resin plate after being immersed in noni fruit juice. An acrylic resin plate of 65 × 10 × 2.5 mm was immersed in 4%, 6%, 8%, 10%, and 12% concentrations of noni fruit juice and distilled water in a control group for 31, 46, and 61 days. The transversal strength of acrylic resin plate was tested using an autograph with a crosshead speed of 1/10mm/second; the distance for the two supporting parts was 50 mm. The data was analyzed by using a One–Way ANOVA test. There was no significant difference in the transversal strength of the plate after being soaked for 31, 46, and 61 days in 4%, 6%, 8%, 10%, and 12% concentrations of the juice. This study showed that the soaking of acrylic resin plate for 31, 46, and 61 days in 4%, 6%, 8%, 10%, and 12% concentrations of noni fruit juice does not decrease the transversal strength.

  18. Dimensional changes of acrylic resin denture bases: conventional versus injection-molding technique.

    Jafar Gharechahi

    2014-08-01

    Full Text Available Acrylic resin denture bases undergo dimensional changes during polymerization. Injection molding techniques are reported to reduce these changes and thereby improve physical properties of denture bases. The aim of this study was to compare dimensional changes of specimens processed by conventional and injection-molding techniques.SR-Ivocap Triplex Hot resin was used for conventional pressure-packed and SR-Ivocap High Impact was used for injection-molding techniques. After processing, all the specimens were stored in distilled water at room temperature until measured. For dimensional accuracy evaluation, measurements were recorded at 24-hour, 48-hour and 12-day intervals using a digital caliper with an accuracy of 0.01 mm. Statistical analysis was carried out by SPSS (SPSS Inc., Chicago, IL, USA using t-test and repeated-measures ANOVA. Statistical significance was defined at P<0.05.After each water storage period, the acrylic specimens produced by injection exhibited less dimensional changes compared to those produced by the conventional technique. Curing shrinkage was compensated by water sorption with an increase in water storage time decreasing dimensional changes.Within the limitations of this study, dimensional changes of acrylic resin specimens were influenced by the molding technique used and SR-Ivocap injection procedure exhibited higher dimensional accuracy compared to conventional molding.

  19. Effect of sodium bicarbonate on Candida albicans adherence to thermally activated acrylic resin

    Fernando Augusto Cervantes Garcia de Sousa

    2009-12-01

    Full Text Available The purpose of this study was to evaluate the effect of 5% sodium bicarbonate on the adherence of Candida albicans to thermally activated acrylic resin. Fifty 4 mm² specimens of acrylic resin were obtained using a metallic matrix. The specimens received chemical polishing, were sterilized and then immersed in Sabouraud broth, inoculated with Candida albicans standardized suspension. After 24 hours of incubation at 37ºC, the specimens were divided into four groups according to the substance used for disinfection (5% sodium bicarbonate, 0.12% digluconate chlorhexidine, vinegar and Corega Tabs. A control group was included, in which distilled water was used. The adhered microorganisms were dispersed, diluted and plated onto culture media to determine the number of colony-forming units (cfu/mL. The results were analyzed through the Mann-Whitney statistical test at the 5% level of significance. Only 0.12% digluconate chlorhexidine and 5% sodium bicarbonate presented a statistically significant difference (p = 0.0010 and p = 0.0156, respectively compared to the control group, decreasing the number of cfu/mL. However, when the different disinfecting solutions were compared with each other, only 0.12% digluconate chlorhexidine presented a statistically significant difference in the reduction of cfu/mL. It was concluded that although 0.12% digluconate chlorhexidine was more effective in the reduction of Candida albicans adherence values to thermally activated acrylic resin, 5% sodium bicarbonate also proved to be a viable alternative.

  20. Biocompatible Metal-Oxide Nanoparticles: Nanotechnology Improvement of Conventional Prosthetic Acrylic Resins

    Nowadays, most products for dental restoration are produced from acrylic resins based on heat-cured Poly(Methyl Methacrylate) (PMMA). The addition of metal nanoparticles to organic materials is known to increase the surface hydrophobicity and to reduce adherence to biomolecules. This paper describes the use of nano structured materials, TiO2 and Fe2O3, for simultaneously coloring and/or improving the antimicrobial properties of PMMA resins. Nanoparticles of metal oxides were included during suspension polymerization to produce hybrid metal oxides-alginate-containing PMMA. Metal oxide nanoparticles were characterized by dynamic light scattering, and X-ray diffraction. Physicochemical characterization of synthesized resins was assessed by a combination of spectroscopy, scanning electron microscopy, viscometry, porosity, and mechanical tests. Adherence of Candida albicans cells and cellular compatibility assays were performed to explore biocompatibility and microbial adhesion of standard and novel materials. Our results show that introduction of biocompatible metal nanoparticles is a suitable means for the improvement of conventional acrylic dental resins.

  1. Effect of water-aging on the antimicrobial activities of an ORMOSIL-containing orthodontic acrylic resin.

    Gong, Shi-Qiang; Epasinghe, D Jeevanie; Zhou, Bin; Niu, Li-Na; Kimmerling, Kirk A; Rueggeberg, Frederick A; Yiu, Cynthia K Y; Mao, Jing; Pashley, David H; Tay, Franklin R

    2013-06-01

    Quaternary ammonium methacryloxy silicate (QAMS), an organically modified silicate (ORMOSIL) functionalized with polymerizable methacrylate groups and an antimicrobial agent with a long lipophilic alkyl chain quaternary ammonium group, was synthesized through a silane-based sol-gel route. By dissolving QAMS in methyl methacrylate monomer, this ORMOSIL molecule was incorporated into an auto-polymerizing, powder/liquid orthodontic acrylic resin system, yielding QAMS-containing poly(methyl methacrylate). The QAMS-containing acrylic resin showed a predominant contact-killing effect on Streptococcus mutans (ATCC 35668) and Actinomyces naeslundii (ATCC 12104) biofilms, while inhibiting adhesion of Candida albicans (ATCC 90028) on the acrylic surface. The antimicrobial activities of QAMS-containing acrylic resin were maintained after a 3month water-aging period. Bromophenol blue assay showed minimal leaching of quaternary ammonium species when an appropriate amount of QAMS (<4wt.%) was incorporated into the acrylic resin. The results suggest that QAMS is predominantly co-polymerized with the poly(methyl methacrylate) network, and only a minuscule amount of free QAMS molecules is present within the polymer network after water-aging. Acrylic resin with persistent antimicrobial activities represents a promising method for preventing bacteria- and fungus-induced stomatitis, an infectious disease commonly associated with the wearing of removable orthodontic appliances. PMID:23485857

  2. Effects of acrylic resin monomers on porcine coronary artery reactivity.

    Abebe, Worku; West, Daniel; Rueggeberg, Frederick A; Pashley, David; Mozaffari, Mahmood S

    2016-07-01

    The purpose of the present investigation was to assess the reactivity of porcine coronary arteries under in vitro conditions following their exposure to methyl methacrylate (MMA) and hydroxyethyl methacrylate (HEMA) monomers. Confirming previous studies using rat aortas, both MMA and HEMA induced acute/direct relaxation of coronary ring preparations, which was partly dependent on the endothelium. With prolonged tissue exposure, both monomers caused time- and concentration-dependent inhibition of receptor-mediated contraction of the vascular smooth muscle caused by prostaglandin F2∝ (PGF2∝), with HEMA causing more inhibition than MMA. Hydroxyethyl methacrylate, but not MMA, also produced impairment of non-receptor-mediated contraction of the coronary smooth muscle induced by KCl. On the other hand, neither HEMA nor MMA altered relaxation of the smooth muscle produced by the direct-acting pharmacological agent, sodium nitroprusside (SNP). While exposure to HEMA impaired endothelium-dependent vasorelaxation caused by bradykinin (BK), MMA markedly enhanced this endothelial-mediated response of the arteries. The enhanced endothelial response produced by MMA was linked to nitric oxide (NO) release. In conclusion, with prolonged tissue exposure, MMA causes less pronounced effects/adverse consequences on coronary smooth muscle function relative to the effect of HEMA, while enhancing vasorelaxation associated with release of NO from the endothelium. Accordingly, MMA-containing resin materials appear to be safer for human applications than materials containing HEMA. PMID:27132475

  3. Kinetics characterization of a novel photopolymerizable siloxane-modified acrylic resin

    An experimental study was carried out for the development and characterization of innovative photopolymerizable siloxane-modified acrylic formulations for possible use as protective coatings. The kinetics of the radical photopolymerization mechanism induced by UV and visible radiations in presence of suitable photoinitiators was studied by a calorimetric analysis by varying the testing conditions (temperature, light power emission, atmosphere). The reactivity, expressed in terms of both heat developed and rate of reaction, was generally found to decrease when the photopolymerization was carried out in air, due the inhibiting action of the oxygen towards the free-radical polymerization. The addition of both a silane coupling agent or a high molecular weight polysiloxane monomer to the acrylic resin was found to reduce the heat of reaction. Experimental data were fitted to a kinetic model to quantify the effects of light intensity and temperature on reaction rates and extent of reaction. A good agreement between the experimental data and the theoretical model was generally found.

  4. Kinetics characterization of a novel photopolymerizable siloxane-modified acrylic resin

    Corcione, C. Esposito, E-mail: carola.corcione@unile.it [Dipartimento di Ingegneria dell' Innovazione, Universita del Salento, via per Monteroni, 73100 Lecce (Italy); Previderio, A.; Frigione, M. [Dipartimento di Ingegneria dell' Innovazione, Universita del Salento, via per Monteroni, 73100 Lecce (Italy)

    2010-09-20

    An experimental study was carried out for the development and characterization of innovative photopolymerizable siloxane-modified acrylic formulations for possible use as protective coatings. The kinetics of the radical photopolymerization mechanism induced by UV and visible radiations in presence of suitable photoinitiators was studied by a calorimetric analysis by varying the testing conditions (temperature, light power emission, atmosphere). The reactivity, expressed in terms of both heat developed and rate of reaction, was generally found to decrease when the photopolymerization was carried out in air, due the inhibiting action of the oxygen towards the free-radical polymerization. The addition of both a silane coupling agent or a high molecular weight polysiloxane monomer to the acrylic resin was found to reduce the heat of reaction. Experimental data were fitted to a kinetic model to quantify the effects of light intensity and temperature on reaction rates and extent of reaction. A good agreement between the experimental data and the theoretical model was generally found.

  5. Effect of an acrylic resin combined with an antimicrobial polymer on biofilm formation

    Juliê Marra

    2012-12-01

    Full Text Available OBJECTIVES: The purpose of this study was to evaluate the antimicrobial activity of an acrylic resin combined with an antimicrobial polymer poly (2-tert-butylaminoethyl methacrylate (PTBAEMA to inhibit Staphylococcus aureus, Streptococcus mutans and Candida albicans biofilm formation. MATERIAL AND METHODS: Discs of a heat-polymerized acrylic resin were produced and divided according to PTBAEMA concentration: 0 (control, 10 and 25%. The specimens were inoculated (10(7 CFU/mL and incubated at 37ºC for 48 h. After incubation, the wells were washed and each specimen was sonicated for 20 min. Replicate aliquots of resultant suspensions were plated at dilutions at 37ºC for 48 h. The number of colony-forming units (CFU was counted and expressed as log (CFU+1/mL and analyzed statistically with α=.05. RESULTS: The results showed that 25% PTBAEMA completely inhibited S. aureus and S. mutans biofilm formation. A significant reduction of log (CFU+1/mL in count of S. aureus (control: 7.9±0.8A; 10%: 3.8±3.3B and S. mutans (control: 7.5±0.7A; 10%: 5.1±2.7B was observed for the group containing 10% PTBAEMA (Mann-Whitney, p0.05, P=0.079. CONCLUSIONS: Acrylic resin combined with 10 and 25% of PTBAEMA showed significant antimicrobial activity against S. aureus and S. mutans biofilm, but it was inactive against the C. albicans biofilm.

  6. In vitro antifungal action of different substances over microwaved-cured acrylic resins

    Henrique Montagner

    2009-10-01

    Full Text Available OBJECTIVE: The presence of Candida albicans on the surfaces of denture-base acrylic resins is strongly related to the development of oral stomatitis. This study evaluated the antifungal action of different agents over microwave-cured acrylic resin without polishing specimens previously contaminated with Candida albicans. MATERIAL AND METHODS: Sixty specimens were immersed in BHI broth previously inoculated with the yeast and stored for 3 h at 37ºC. They were divided into 5 experimental groups (n=10: G1: 2% chlorhexidine solution (10 min; G2: 0.5% sodium hypochlorite (10 min; G3: modified sodium hypochlorite (10 min; G4: effervescent agent (5 min; G5: hydrogen peroxide 10v (30 min. The specimens of the control group 1 (C1 were not disinfected. Ten additional specimens of the control group 2 (C2 were not infected with the yeast, aiming to check the asepsis during the experiment. The disinfection agents were neutralized and the acrylic resin specimens were immersed in BHI Broth for 24 h. Culture media turbidity was evaluated spectrophotometrically according to the transmittance degree, i.e. the higher the transmittance the stronger the antimicrobial action. Statistical analysis was performed (Kruskal-Wallis Test, p<0.05. RESULTS: The results, represented by the medians, were: G1 = 40; G2 = 100; G3 = 100; G4 = 90; G5 = 100; C1 = 40; C2 = 100. CONCLUSIONS: This in vitro study suggested that sodium hypochlorite-based substances and hydrogen peroxide are more efficient disinfectants against C. albicans than 2% chlorhexidine solution and the effervescent agent.

  7. Properties of Low Surface Energy Fluorocarbon Polymers with Fluoro-acrylic Resins

    LIU Xiusheng; WANG Can; LIU Lanxuan; LI Jian; GAO Wanzhen

    2008-01-01

    The low surface energy fluorocarbon polymer from the synthesized fluoro-acrylic resins was developed. Then the molecule orientation principle of nonpolar and polar functional groups in the polymers was analyzed. And the contact angles of pure water drops on the surfaces of various fluoro-monomer homopolymers and interpolymers were measured. So the relation of polymers' fluoro-content with the surface energy was determined. The distribution of fluoric functional groups in the polymers was investigated. And the test results show that though the total fluorine content of the fluorocarbon polymers is relative few, their surface energy is really low due to the enrichment of fluoro-chains on the polymers surface.

  8. Effects of Sonication Conditions on Ultrasonic Dispersion of Inorganic Particles in Acrylic Resin

    Tuziuti, Toru; Yasui, Kyuichi; Towata, Atsuya; Kato, Kazumi

    2011-07-01

    The effects of sonication conditions on the ultrasonic dispersion of titanium dioxide particles in acrylic resin are investigated. Pulsing operation at appropriate on-off duty cycles enables us to attain a particle size smaller than that at a continuous wave (CW) at the same net time of sonication between operations. It is useful that frequency-sweep operation attains almost the same particle size as that at CW, which can provide a constant dispersion of particles even if the resonant frequency used to effectively drive an ultrasonic transducer changes with liquid conditions, such as the temperature and acoustic impedance of a liquid.

  9. Chronic swelling from entrapment of acrylic resin in a surgical extraction site

    Weiting Ho

    2010-01-01

    Full Text Available When acrylic resin is inadvertently embedded in oral tissue, it can result in a pronounced chronic inflammatory response. This report describes a case in which temporary crown and bridge resin was forced into a surgical extraction site after the two adjacent teeth were prepared for a bridge immediately following extraction of a maxillary premolar. The patient experienced swelling at the extraction site over a ten month period despite treatment with antibiotics and anti-inflammatory drugs. After detection and removal of the foreign body, the symptoms resolved. The episode contributed to periodontal bone loss around an adjacent tooth. While morbidity of this nature is rare, this case reinforces the need to investigate persistent signs of inflammation and account for dental materials that are lost during the course of treatment.

  10. Electron beam curing of acrylated epoxy resins for anisotropic conductive film application

    Radiation curable acrylated epoxy oligomer was found to be an effective resin system for application to electron beams (EB) on curing of anisotropic conducting film. To study curing degree as a function of EB dosage, we irradiated bisphenol-A type acrylate epoxy oligomer samples with doses of 5 to 600 kGy of EB. To investigate the effect of a metal barrier for potential industrial application, a 3 mm thick Al plate was placed in front of the samples, and the curing parameters were compared with the ones irradiated without an Al plate. As the dosage of the EB irradiation was increased, the glass transition temperature of the sample ranged from 46.8 to 62.2 °C for the epoxy composites without placing an Al plate, and from 46.4 to 64.1 °C for their counterparts with a 3 mm thick Al plate. These results confirm that enhancement of the curing degree with increasing EB irradiation is possible even in the presence of a metal plate. The scanning electron microscope images of the fracture surfaces are presented as evidence of the morphological changes of the EB cured epoxy samples. - Highlights: ► Acrylated epoxy oligomer was cured by irradiation of the electron beam. ► Curing degree was increased with increasing dosage of the electron beam. ► Electron beam can be used for the bonding of anisotropic conducting films

  11. Perubahan suhu transisi kaca dan massa resin akrilik heat cured akibat kelembaban dan lama penyimpanan (Changes in glass transition temperature and heat cured acrylic resin mass due to moisture and storage time

    Sherman Salim

    2014-09-01

    Full Text Available Background: Acrylic resins, especially poly methyl methacrylate (PMMA was introduced in 1937. Acrylic resin has favorable properties, among others, aesthetic, color and texture similar to that of the gingival aesthetic in the mouth, relatively low water absorption and dimensional changes. However, some studies suggest that the duration of storage of acrylic resin will affect the changes in the glass transition temperature and the mass of acrylic resin. Purpose: The objective of this research was to study the effect of humidity and storage time led to changes in the glass transition temperature and the mass of the acrylic resin. Methods: The research method is experimental laboratory. Acrylic resin specimens are kept in conditions of humidity of 90%, 70%, 40% and 30% for 24 hours, one week, one month and two months. In this study used three methods of curing, namely conventional JIs, 24-hour curing at 70 °C and using the microwave. Results: Low humidity causes changes in the glass transition temperature and the mass of acrylic resin. Longer storage of acrylic resins in low humidity, can affect change greater than the glass transition temperature and the mass of acrylic resin. Conclusion: It can be concluded that the humidity and longer storage of acrylic resins can affect the glass transition temperature and a change in mass.Latar belakang: Resin akrilik terutama poli metil metakrilat (PMMA telah diperkenalkan pada tahun 1937. Resin akrilik memiliki sifat yang menguntungkan antara lain estetis, warna dan tekstur mirip dengan gingiva sehingga estetik di dalam mulut baik, daya serap air relatif rendah dan perubahan dimensi kecil. Akan tetapi, dari beberapa penelitian menyatakan bahwa lamanya waktu penyimpanan resin akrilik akan berpengaruh pada perubahan suhu transisi kaca dan massa resin akrilik. Tujuan: Tujuan dari penelitian ini adalah untuk mempelajari pengaruh kelembaban dan waktu penyimpanan yang menyebabkan perubahan suhu transisi kaca dan

  12. Effect of chemical surface treatments and repair material on transverse strength of repaired acrylic denture resin

    Vojdani Mahroo

    2008-01-01

    Full Text Available Purpose: This study was performed to evaluate the transverse strength of a denture base resin (H, repaired with an autopolymerizing acrylic resin (A or a visible light-curing (VLC resin (T following the use of three chemical solvents: methyl methacrylate monomer, aceton or chloroform. Materials and Methods: Eighty specimens (65.0 x 10.0 x 3.3 mm of H were fabricated and stored in distilled water at 37°C for seven days. Specimens were divided into eight equal groups of 10. In each group, specimens were sectioned in the middle to create a 10 mm gap. Two groups served as controls and had no surface treatment. They were repaired with A or T materials. In the remaining six experimental groups, specimen surfaces were treated with ac for 30 sec or mma for 180 sec or ch for 5 sec. Then A or T material was placed on the treated surfaces, using the same preparation molds. After seven days′ storage at 37°C, the transverse bond strength (MPa of the specimens was measured using a three-point bending test. A two-way ANOVA and a Tukey HSD were performed to identify significant differences ( P < 0.05. The nature of the failures was noted as adhesive, cohesive or mixed. Results: Significant differences were found between the controls and experimental groups ( P < 0.05. In the control groups, repair with A showed significantly higher strength (60.3 MPa than those repaired with T (51.3 MPa. Mean transverse strength of experimental specimens repaired with A was (75.06 MPa which was significantly greater than those repaired with T (67.9 MPa. Although surface treatment increased repair strength, no significant differences were detected between the effects of the chemical etchants. Conclusions: The autopolymerizing resin exhibited significantly higher repair strength than VLC resin. The transverse strength of the repaired specimens was increased significantly after chemical treatments.

  13. Studies on acrylated epoxydised triglyceride resin-co-butyl methacrylate towards the development of biodegradable pressure sensitive adhesives.

    David, S Begila; Sathiyalekshmi, K; Gnana Raj, G Allen

    2009-12-01

    The potential chemical utility of Soya bean oil for the preparation of novel biodegradable polymeric pressure sensitive adhesive has been investigated. Epoxy resin was prepared through in situ epoxidation of Soya bean oil under controlled reaction conditions. Acrylated epoxidised triglyceride resin (AET resin) and copolymer of AET resin with butyl methacrylate were prepared and evaluated. Higher the concentration of butyl methacrylate higher is the degree of copolymerization of AET resin with butyl methacrylate. An optimum concentration of AET resin with butyl methacrylate (100 : 0.40) yields favourable shear holding time and peel strength to qualify as pressure sensitive adhesive. The candidate PSA formulation is biodegradable with antimicrobial activity against gram positive S. aureus ATCC 25923. PMID:18584126

  14. Using Latex Balls and Acrylic Resin Plates to Investigate the Stacking Arrangement and Packing Efficiency of Metal Crystals

    Ohashi, Atsushi

    2015-01-01

    A high-school third-year or undergraduate first-semester general chemistry laboratory experiment introducing simple-cubic, face-centered cubic, body-centered cubic, and hexagonal closest packing unit cells is presented. Latex balls and acrylic resin plates are employed to make each atomic arrangement. The volume of the vacant space in each cell is…

  15. Characterization of acrylic resins used for restoration of artworks by pyrolysis-silylation-gas chromatography/mass spectrometry with hexamethyldisilazane.

    Osete-Cortina, Laura; Doménech-Carbó, María Teresa

    2006-09-15

    A procedure based on the technique of the pyrolysis-GC/MS has been applied, in this work, in order to determine the composition of synthetic acrylic resins employed in artworks. The method is based on the on line derivatization of these resins using hexamethyldisilazane (HMDS). Results obtained have been compared with those others from direct pyrolysis and in situ thermally assisted hydrolysis and methylation with tetramethylammonium hydroxide (TMAH). Sensitivity using HMDS as derivatising reagent is found similar to that from direct pyrolysis and methylation with TMAH. Better resolution of the most representative peaks has been also obtained. Additionally, this method reduces the formation of free acrylic acid molecules during the pyrolysis process and, in consequence, more simplified and well-resolved chromatograms are obtained. Finally, the reported procedure has been successfully used for characterizing several acrylic-based varnishes and binding media currently used in Fine Arts and real pictorial samples from graffiti performed on a Middle Ages bridge. PMID:16797558

  16. The change of temperature on the shear strength of permanent soft-liner on acrylic resin

    Waloejo Noegroho

    2006-06-01

    Full Text Available The characteristics of dental material such as solubility and water resorption, the use of adhesive, storage condition or used as thermo cycling or elevated-temperature are factors that can effect bond strength. The purpose of this study was to investigate the change of temperature on the shear strength of permanent soft liner on acrylic resin. Twenty-four specimens were divided into 3 groups and immersed in water at: 5 °C, 37 °C and 55 °C. Autograph AG 10 TE Shimadzu was used to determine the shear strength. The statistical test (ANOVA and LSD; showed that there were significant differences between temperature groups. The shear strength of 37 °C was higher than the temperature of 5 °C and 55 °C.

  17. Prediction of capacity factors for aqueous organic solutes adsorbed on a porous acrylic resin

    Thurman, E.M.

    1978-01-01

    The capacity factors of 20 aromatic, allphatic, and allcycllc organic solutes with carboxyl, hydroxyl, amine, and methyl functional groups were determined on Amberlite XAD-8, a porous acrylic resin. The logarithm of the capacity factor, k???, correlated inversely with the logarithm of the aqueous molar solubility with significance of less than 0.001. The log k???-log solubility relationship may be used to predict the capacity of any organic solute for XAD-8 using only the solubility of the solute. The prediction is useful as a guide for determining the proper ratio of sample to column size In the preconcentration of organic solutes from water. The inverse relationship of solubility and capacity is due to the unfavorable entropy of solution of organic solutes which affects both solubility and sorption.

  18. Novel acrylic resin denture base with enhanced mechanical properties by the incorporation of PMMA-modified hydroxyapatite

    Yingying Pan; Fengwei Liu; Dan Xu; Xiaoze Jiang; Hao Yu; Meifang Zhu

    2013-01-01

    A kind of novel acrylic resin denture base enhanced by PMMA-modified hydroxyapatite (M-HAP) was prepared and the modification effect of HAP on the mechanical properties of denture base material was investigated in the present study. HAP whiskers were prepared by hydrothermal homogeneous precipitation process and were silanized by the coupling agent, 3-methacryloxy propyl trimethoxyl silane (g-MPS), to induce the vinyl groups onto its surface. Methyl methacrylate (MMA) were then modified outside the vinyl functionalized HAP via polymerization to build a similar chemical structure with the acrylic matrix. A novel acrylic resin denture base was obtained through self-curing process with the incorporation of this PMMA-modified HAP, and the content of which ranged from 0 wt% to 0.8 wt%. Thermal gravimetric analysis (TGA), fourier transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM), and universal testing apparatus were used to characterize M-HAP and corresponding denture base. The results showed that PMMA were successfully grafted onto the surface of HAP whiskers with up to 15 wt% and the modification turned out to be useful for the dispersion and compatibility of whiskers in the acrylic resin matrix. The mechanical properties of the prepared denture base samples were enhanced greatly after incorporating with M-HAP fillers. The optimal incorporated content of M-HAP was also investigated.

  19. The Effect of Experimental Denture Cleanser Solution Ricinus communis on Acrylic Resin Properties

    Marina Xavier Pisani

    2010-09-01

    Full Text Available This study evaluated heat-polymerized (HPR and microwave-polymerized acrylic resins (MPR, after immersion in water, 1% hypochlorite and Ricinus communis solution (RC. Knoop hardness, color alteration, roughness and flexural strength tests were performed after obtaining the specimens and after time intervals of 15 (T15 and 183 (T183 days. Variations in data (Δ were submitted to ANOVA and Tukey tests (P = 0.05. For ΔT15 HPR there was greater variation in hardness when immersed in water (P = 0.00 and for MPR, after immersion in RC (P = 0.00. RC caused the greatest variation in roughness (P = 0.015. Color alteration was not significant (P = 24.46. Hypochlorite caused a decrease in flexural strength (P = 0.37. After ΔT183, hypochlorite and RC caused a decrease in HPR hardness value (P = 0.00. MPR showed the greatest variation in roughness (P = 0.01. HPR presented the most color alteration after immersion in RC (P = 0.214. Hypochlorite and RC caused the lowest flexural strength values for MPR (P = 0.89. RC caused alterations in resin properties, and was not shown to be superior to hypochlorite.

  20. Antifungal Effect of Henna against Candida albicans Adhered to Acrylic Resin as a Possible Method for Prevention of Denture Stomatitis

    Nawasrah, Amal; AlNimr, Amani; Ali, Aiman A.

    2016-01-01

    Denture stomatitis is a very common disease affecting the oral mucosa of denture wearers. The aim of this study was to measure the antifungal effect of henna against Candida albicans adhered to acrylic resin as a possible method for prevention of denture stomatitis. One-hundred-eighty acrylic plates were prepared of heat-cured acrylic denture resin. The specimens were divided into six groups of 30 samples each. The first group was only polymer and monomer following the conventional manufacturer instruction for processing complete dentures. The other five groups were processed by adding different concentration of Yamani henna powder (Harazi) to the polymer in a concentration of henna: polymer 1%, 2.5%, 5%, 7.5% and 10%, respectively. Samples were incubated in artificial saliva rich with Candida albicans at 37 °C, and the effect of henna on Candida albicans was evaluated in two different methods: semi-quantitative slide count and a culture-based quantitative assay (quantitative). Variation in the number of live Candida was observed with the increase in the concentration of Yamani henna powder. It was observed that the variation in live Candida, between control group and group B (concentration of Yamani henna powder was 1%), was statistically significant with a p-value of 0.0001. Similarly, variations in live Candida were significant, when the concentration of powder was 7.5% or 10% in contrast with control group and p-values were 0.0001 and 0.001 respectively. Adding henna to acrylic resin denture could be effective in controlling Candida albicans proliferation on the denture surface; however, its effects on the physical properties of acrylic resin denture need further studies. PMID:27223294

  1. Antifungal Effect of Henna against Candida albicans Adhered to Acrylic Resin as a Possible Method for Prevention of Denture Stomatitis.

    Nawasrah, Amal; AlNimr, Amani; Ali, Aiman A

    2016-01-01

    Denture stomatitis is a very common disease affecting the oral mucosa of denture wearers. The aim of this study was to measure the antifungal effect of henna against Candida albicans adhered to acrylic resin as a possible method for prevention of denture stomatitis. One-hundred-eighty acrylic plates were prepared of heat-cured acrylic denture resin. The specimens were divided into six groups of 30 samples each. The first group was only polymer and monomer following the conventional manufacturer instruction for processing complete dentures. The other five groups were processed by adding different concentration of Yamani henna powder (Harazi) to the polymer in a concentration of henna: polymer 1%, 2.5%, 5%, 7.5% and 10%, respectively. Samples were incubated in artificial saliva rich with Candida albicans at 37 °C, and the effect of henna on Candida albicans was evaluated in two different methods: semi-quantitative slide count and a culture-based quantitative assay (quantitative). Variation in the number of live Candida was observed with the increase in the concentration of Yamani henna powder. It was observed that the variation in live Candida, between control group and group B (concentration of Yamani henna powder was 1%), was statistically significant with a p-value of 0.0001. Similarly, variations in live Candida were significant, when the concentration of powder was 7.5% or 10% in contrast with control group and p-values were 0.0001 and 0.001 respectively. Adding henna to acrylic resin denture could be effective in controlling Candida albicans proliferation on the denture surface; however, its effects on the physical properties of acrylic resin denture need further studies. PMID:27223294

  2. Antifungal Effect of Henna against Candida albicans Adhered to Acrylic Resin as a Possible Method for Prevention of Denture Stomatitis

    Amal Nawasrah

    2016-05-01

    Full Text Available Denture stomatitis is a very common disease affecting the oral mucosa of denture wearers. The aim of this study was to measure the antifungal effect of henna against Candida albicans adhered to acrylic resin as a possible method for prevention of denture stomatitis. One-hundred-eighty acrylic plates were prepared of heat-cured acrylic denture resin. The specimens were divided into six groups of 30 samples each. The first group was only polymer and monomer following the conventional manufacturer instruction for processing complete dentures. The other five groups were processed by adding different concentration of Yamani henna powder (Harazi to the polymer in a concentration of henna: polymer 1%, 2.5%, 5%, 7.5% and 10%, respectively. Samples were incubated in artificial saliva rich with Candida albicans at 37 °C, and the effect of henna on Candida albicans was evaluated in two different methods: semi-quantitative slide count and a culture-based quantitative assay (quantitative. Variation in the number of live Candida was observed with the increase in the concentration of Yamani henna powder. It was observed that the variation in live Candida, between control group and group B (concentration of Yamani henna powder was 1%, was statistically significant with a p-value of 0.0001. Similarly, variations in live Candida were significant, when the concentration of powder was 7.5% or 10% in contrast with control group and p-values were 0.0001 and 0.001 respectively. Adding henna to acrylic resin denture could be effective in controlling Candida albicans proliferation on the denture surface; however, its effects on the physical properties of acrylic resin denture need further studies.

  3. Comparison of Adhesive Resistance to Chewing Gum among Denture Base Acrylic Resin, Cobalt-Chromium Alloy, and Zirconia.

    Wada, Takeshi; Takano, Tomofumi; Ueda, Takayuki; Sakurai, Kaoru

    2016-01-01

    The purpose of this study was to compare the adhesiveness of chewing gum to acrylic resin, cobalt-chromium alloy, and zirconia. Test specimens were fabricated using acrylic resin (resin), cobalt-chromium alloy (Co-Cr), and Ceria stabilized tetragonal zirconia polycrystal-based nanostructured zirconia/alumina composite (zirconia). Specimens of each material were attached to the upper and lower terminals of a digital force gauge. The operator masticated chewing gum, wiped off any saliva, and placed the gum on the lower specimen. The gum was compressed to a thickness of 1 mm between the upper and lower specimens. Thereafter, traction was applied to the upper specimen at a cross-head speed of 100 mm/min under 3 different conditions (dry, wet with distilled water, and wet with artificial saliva) to determine the maximum adhesive strength of the chewing gum. The statistical analysis was performed using the Bonferroni test after a one-way analysis of variance (α=0.05). Under dry conditions, adhesive force was 14.8±6.8 N for resin, 14.0±4.8 N for Co-Cr, and 4.3±2.3 N for zirconia. Significant differences were noted between resin and zirconia, and between Co-Cr and zirconia. When distilled water was applied to the specimen surface, the adhesive strength was 16.8±1.7 N for resin, 8.3±2.1 N for Co-Cr, and 2.7±0.8 N for zirconia. Significant differences were noted between resin and Co-Cr, resin and zirconia, and Co-Cr and zirconia. When artificial saliva was applied to the specimen surface, the adhesive force was 18.5±2.8 N for resin, 5.3±0.8 N for Co-Cr, and 3.0±1.7 N for zirconia. Significant differences were noted between resin and Co-Cr, and resin and zirconia. Chewing gum adhered less strongly to zirconia than to acrylic resin or cobalt-chromium alloy. PMID:26961330

  4. Effect of toothbrushes and denture brushes on heat-polymerized acrylic resins.

    de Freitas Pontes, Karina Matthes; de Holanda, Janaína Câncio; Fonteles, Cristiane Sa Roriz; Pontes, Cassio de Barros; Lovato da Silva, Cláudia Helena; Paranhos, Helena de Freitas Oliveira

    2016-01-01

    It is important to choose an appropriate brush for denture cleaning to prevent damage to the surface properties of prosthetic devices. The purpose of this study was to evaluate the abrasiveness of toothbrushes and denture brushes on boiled and microwave-processed acrylic resins. Specimens of 4 resin brands were prepared (n = 30). Five brands of brushes (n = 6) were used in a toothbrushing machine, first for 17,800 strokes and then for an additional 35,600 strokes (total of 53,400), at a load of 200 g. An analytical balance and a profilometer were used to assess the weight and surface roughness, respectively, before and after 17,800 and 53,400 strokes. Analysis of variance and Tukey tests were used for data analysis (α = 0.05). Weight loss increased with time, while surface roughness remained the same. There were no statistically significant differences among toothbrushes and denture brushes in the resulting weight loss (17,800 strokes, 1.83 mg; 53,400 strokes, 3.78 mg) or surface roughness (17,800 or 53,400 strokes, 0.14 µm). The weight loss values after 53,400 brush strokes indicated that Clássico (2.28 mg) and VIPI Wave (2.75 mg) presented significantly greater abrasion resistance than Lucitone 550 (3.36 mg) and Onda-Cryl (2.85 mg) (P < 0.05). The type of brush and the polymerization method did not influence resin wear after brushing. PMID:26742168

  5. Influence of nanoparticles on color stability, microhardness, and flexural strength of acrylic resins specific for ocular prosthesis

    Andreotti AM

    2014-12-01

    Full Text Available Agda Marobo Andreotti, Marcelo Coelho Goiato, Amália Moreno, Adhara Smith Nobrega, Aldiéris Alves Pesqueira, Daniela Micheline dos Santos Araçatuba Dental School, São Paulo State University, Araçatuba, São Paulo, Brazil Abstract: The aim of this study was to assess the effect of adding nanoparticles to N1 acrylic resin intended for artificial sclera, in terms of the color stability, microhardness, and flexural strength of the resin. Three hundred samples of N1 acrylic resin were used: 100 samples for color stability and microhardness tests (each test was performed on the opposite side of each sample, and 200 samples for flexural strength testing (100 samples before and after 1,008 hours of accelerated aging. Samples for each test were separated into ten groups (n=10, ie, without nanoparticles (control group or with nanoparticles of zinc oxide, titanium dioxide (TiO2, and barium sulfate at weight concentrations of 1%, 2%, and 2.5% (nanoparticle groups. Data were subjected to statistical analysis with nested analysis of variance and Tukey’s test (P<0.05 significance level. Among the nanoparticle groups, the TiO2 groups showed better color stability at all concentrations. Microhardness values increased after artificial aging, except for the control and zinc oxide groups. After aging, the 1%–2% TiO2 groups had significantly higher microhardness values compared with the other nanoparticle groups. Before aging, there was a significant difference in flexural strength between the control and nanoparticle groups. After aging, the control and TiO2 groups, regardless of concentration, showed the lowest flexural strength values. Incorporation of nanoparticles directly influenced the acrylic resin properties, with TiO2 being the most influential nanoparticle in terms of the evaluated properties. Keywords: acrylic resins, eye, artificial, color, hardness, nanoparticles

  6. Radiation sensitive acrylate composition

    This application relates to radiation-sensitive compositions and more particularly to such compositions comprising acrylated esters. As used in this specification, the term acrylated esters refers to either acrylic or methacrylic acid resins. 3 tabs

  7. 丙烯酸树脂对PVDF面漆性能的影响%The Influences of Acrylic Resin on the Performance of PVDF Top Coat

    苏狄

    2012-01-01

    研究了丙烯酸树脂对聚偏二氟乙烯(PVDF)面漆性能的影响。实验表明:丙烯酸树脂的组成结构对PVDF树脂的混溶性有影响。丙烯酸树脂结构中氢键给体的含量越多,丙烯酸树脂与PVDF树脂分散体的混溶性越差,聚甲基丙烯酸甲酯树脂与PVDF树脂的混溶性最好。外加强氢键给体也会破坏PVDF树脂与丙烯酸树脂形成的氢键,使体系的黏度和触变性急剧增加。%The influences of acrylic resin on polyvinylidene difluoride ( PVDF )top coat were studied. Experiments showed that the compatibility impact of PVDF resin depend on the composition of acrylic resin . With increasing of the content of hydrogen bond donors in the acrylic resin structure, the compatibility of acrylic resin and PVDF dispersion was decreased. PMMA resin has the best compatibility. While adding other strong hydrogen bond donors, the hydrogen bonds between PVDF resin and acrylic resin will be destroyed, so that the viscosity and thixotropy of the system were increased dramatically.

  8. Investigation into the Effect of Use of Metal Primer on Adhesion of Heat Cure Acrylic Resin to Cast Titanium: An In Vitro Study

    Podder, Sudipto; Goel, Preeti; Kar, Sunil; Bhattacharyya, Jayanta

    2013-01-01

    The availability of adhesive primers capable of bonding chemically to base metal alloys without well defined passive oxide surface film has been improved significantly over the last decade. Therefore, the purpose of the study was to compare and evaluate the effect of metal primer on adhesion of heat cure acrylic resin to cast titanium. Shear bond strength test was conducted on 80 commercially pure titanium cast metal heat-cure acrylic resin discs treated with different surface treatments. The...

  9. Safety and Tolerability of Essential Oil from Cinnamomum zeylanicum Blume Leaves with Action on Oral Candidosis and Its Effect on the Physical Properties of the Acrylic Resin

    Julyana de Araújo Oliveira; Ingrid Carla Guedes da Silva; Leonardo Antunes Trindade; Edeltrudes de Oliveira Lima; Hugo Lemes Carlo; Alessandro Leite Cavalcanti; Ricardo Dias de Castro

    2014-01-01

    The anti-Candida activity of essential oil from Cinnamomum zeylanicum Blume, as well as its effect on the roughness and hardness of the acrylic resin used in dental prostheses, was assessed. The safety and tolerability of the test product were assessed through a phase I clinical trial involving users of removable dentures. Minimum inhibitory concentration (MIC) and minimum fungicidal concentrations (MFC) were determined against twelve Candida strains. Acrylic resin specimens were exposed to a...

  10. Evaluation of efficacy of commercial denture cleansing agents to reduce the fungal biofilm activity from heat polymerized denture acrylic resin: An in vitro study

    Mithilesh M Dhamande; Pakhan, Ashok J; Ram U Thombare; Shyam L Ghodpage

    2012-01-01

    Aims: To compare and evaluate Candida removing effects of three most commonly available varieties of commercial denture cleansers from heat polymerized acrylic resins. To compare and evaluate Candida lytic effects of denture cleansers. To assess the effect of time on ability of denture cleansers in reducing Candidal biofilm. Materials and Methods: A specially designed metal mold was fabricated to obtain wax plates of uniform dimensions which were used to fabricate heat cure acrylic resin plat...

  11. Fabrication of micro-dot arrays and micro-walls of acrylic acid/melamine resin on aluminum by AFM probe processing and electrophoretic coating

    Kurokawa, S.; Kikuchi, T.; Sakairi, M. [Graduate School of Engineering, Hokkaido University, N-13, W-8, Kita-Ku, Sapporo 060-8628 (Japan); Takahashi, H. [Graduate School of Engineering, Hokkaido University, N-13, W-8, Kita-Ku, Sapporo 060-8628 (Japan)], E-mail: takahasi@elechem1-mc.eng.hokudai.ac.jp

    2008-11-30

    Micro-dot arrays and micro-walls of acrylic acid/melamine resin were fabricated on aluminum by anodizing, atomic force microscope (AFM) probe processing, and electrophoretic deposition. Barrier type anodic oxide films of 15 nm thickness were formed on aluminum and then the specimen was scratched with an AFM probe in a solution containing acrylic acid/melamine resin nano-particles to remove the anodic oxide film locally. After scratching, the specimen was anodically polarized to deposit acrylic acid/melamine resin electrophoretically at the film-removed area. The resin deposited on the specimen was finally cured by heating. It was found that scratching with the AFM probe on open circuit leads to the contamination of the probe with resin, due to positive shifts in the potential during scratching. Scratching of the specimen under potentiostatic conditions at -1.0 V, however, resulted in successful resin deposition at the film-removed area without probe contamination. The rate of resin deposition increased as the specimen potential becomes more positive during electrophoretic deposition. Arrays of resin dots with a few to several tens {mu}m diameter and 100-1000 nm height, and resin walls with 100-1000 nm height and 1 {mu}m width were obtained on specimens by successive anodizing, probe processing, and electrophoretic deposition.

  12. Fabrication of micro-dot arrays and micro-walls of acrylic acid/melamine resin on aluminum by AFM probe processing and electrophoretic coating

    Micro-dot arrays and micro-walls of acrylic acid/melamine resin were fabricated on aluminum by anodizing, atomic force microscope (AFM) probe processing, and electrophoretic deposition. Barrier type anodic oxide films of 15 nm thickness were formed on aluminum and then the specimen was scratched with an AFM probe in a solution containing acrylic acid/melamine resin nano-particles to remove the anodic oxide film locally. After scratching, the specimen was anodically polarized to deposit acrylic acid/melamine resin electrophoretically at the film-removed area. The resin deposited on the specimen was finally cured by heating. It was found that scratching with the AFM probe on open circuit leads to the contamination of the probe with resin, due to positive shifts in the potential during scratching. Scratching of the specimen under potentiostatic conditions at -1.0 V, however, resulted in successful resin deposition at the film-removed area without probe contamination. The rate of resin deposition increased as the specimen potential becomes more positive during electrophoretic deposition. Arrays of resin dots with a few to several tens μm diameter and 100-1000 nm height, and resin walls with 100-1000 nm height and 1 μm width were obtained on specimens by successive anodizing, probe processing, and electrophoretic deposition

  13. 水溶性丙烯酸酯树脂改性聚酯树脂的研究%Study on water-soluble acrylic resin modified polyester resin

    张丽丽; 陈丽佳; 孙兵杨; 许琼娜

    2012-01-01

    In this paper, a kind of environmental resin which has the advantage of acrylic acid resin and polyester resin was prepared by modification to polyester resin with acrylic acid pre-poly, Lots of conditions that affect the preparation of acrylate prepolymer and the process of esterification and condensation polymerization were also discussed in this paper. By using amino resin as curing agent, the properties of filming of water soluble acrylic acid modified ployester was studied, which has solved the compatibility issue between polyester resin and amino resin.%采用丙烯酸酯预聚物对聚酯树脂进行改性的方法,制备出兼具丙烯酸树脂和聚酯树脂优点的环保型树脂,探讨了影响丙烯酸酯预聚体制备及酯化缩聚反应工艺过程的各种影响因素,并以氨基树脂为固化剂,考察了水溶性丙烯酸树脂改性聚酯树脂成膜的性能,解决了聚酯树脂与氨基树脂的相容性问题.

  14. Nanocomposite of photocurable epoxy-acrylate resin and carbon nanotubes: dynamic-mechanical, thermal and tribological properties

    Marcos Nunes dos Santos

    2013-04-01

    Full Text Available In this study, the thermal, dynamic-mechanical and tribological behavior of nanocomposites of a photocurable epoxy-acrylate resin and multiwalled carbon nanotubes (MWCNT are investigated. A route consisting of a combination of sonication, mechanical and magnetic stirring is used to disperse 0.25-0.75 wt. (% MWCNT into the resin. Two photocuring cycles using 12 hours and 24 hours of UV-A radiation are studied. The storage modulus, the loss modulus and the tan delta are obtained by dynamic mechanical analysis. Thermal stability is investigated by thermogravimetry, morphology by transmission electronic microscopy (TEM and tribological performance using a pin-on-disk apparatus. The results indicate an increase in stiffness and higher ability to dissipate energy, as well as a shift in the glass transition temperature for the nanocomposites. The addition of nanofillers also decreased friction coefficient and wear rate of the nanocomposites but did not change the observed wear mechanisms.

  15. Preparation, morphology and mechanical properties of acrylate-modified polyurethane/unsaturated polyester resin graft-ipns

    唐冬雁; 乔英杰; 赵连城

    2003-01-01

    Acrylate-modified polyurethane resin was first synthesized, and interpenetrated with unsaturated polyester resin to form IPNs and gradient IPNs which cured at room temperature. The polymerization process was traced by an IR spectroscopy technique and the simultaneous interpenetrating techniques were determined. The morphology of these IPNs were estimated by TMA and TEM methods. The results indicated that large amount of interpenetrating and entanglement make Tg linked up effectively, and domains between two phases can be in nanometre ranges, which changed with composition ratios. The mechanical properties results showed that IPNs varied from elastomeric to plastic materials. It was noteworthy that, with the introduction of modified groups and the formation of graft construction in IPNs, the miscibility in the systems was improved a lot. These further led to the improved mechanical properties of IPNs with elastomer reinforced and plasticizer toughened as well. The reinforced miscibility between the networks can apparently change mechanical property especially for the gradient ones when the materials are elongated.

  16. 40 CFR 414.40 - Applicability; description of the thermoplastic resins subcategory.

    2010-07-01

    ... the products classified under SIC 28213 thermoplastic resins including those resins and resin groups... *ABS-SAN Resins *Acrylate-Methacrylate Latexes *Acrylic Latex *Acrylic Resins *Cellulose Acetate Butyrates Cellulose Acetate Resin *Cellulose Acetates *Cellulose Acetates Propionates Cellulose...

  17. Study on synthesis of high content acrylic resin%高含量丙烯酸树脂的合成研究

    高凯; 孙继昌

    2013-01-01

    Emulsion polymerization of acrylic resin is introduced. The high solid content, transparent and multipurpose acrylic resin was obtained through adjusting monomer ratio, kinds and amounts of initiators and emulsifier by emulsion polymerization.%  介绍了一种乳液聚合方法,通过乳液聚合,调整单体比例,控制引发剂和乳化剂的品种及数量,合成高含固量、透明、多用途的丙烯酸树脂。

  18. The use of acrylic resin oral prosthesis in radiation therapy of oral cavity and paranasal sinus cancer

    In radiation therapy of cancer of the oral cavity and the paranasal sinuses, the extent to which the tissues of the oral cavity are included in the radiation treatment portals will determine the severity of the oral discomfort during treatment. This will affect the nutritional status of the patients, and may eventually affect the total dose of radiation which the patients can receive for treatment of their cancers. In cooperation with the Maxillofacial Prosthetic Department, an acrylic resin oral prosthesis was developed. This prosthesis is easy to use and can be made for each individual patient within 24 hours. It allows for maximum sparing of the normal tissues in the oral cavity and can be modified for shielding of backscattered electrons from heavy metals in the teeth. We have also found that acrylic resin extensions can be built onto the posterior edge of post-maxillectomy obturators; this extension can be used as a carrier for radioactive sources to deliver radiation to deep seated tumor modules in the paranasal sinuses

  19. Perubahan warna lempeng resin akrilik yang direndam dalam larutan desinfektan sodium hipoklorit dan klorhexidin (The color changes of acrylic resins denture base material which are immersed in Sodium hypochlorite and chlorhexidine

    David David

    2006-03-01

    Full Text Available One of the acrylic resins properties is the water absorption including color fluids and chemically fluids that affect on the color changes of the acrylic resins. This laboratory experiments studied sodium hypochlorite and chlorhexidine effect on the color changes of acrylic denture base resins material. The study was conducted by immersing heat cured acrylic plate samples of 26 mm of diameter and 0.4 mm of thickness in sodium hypochlorite for 10; 70 and 140 minutes and chlorhexidine for 15; 105 and 210 minutes. Seven samples were used for each experiment. An optical spectrometer BPX-47 type photo cell and a digital microvoltage were used for the color changes observation. The statistical test used were t-test, One-way ANOVA and LSD with 0.05 significance degree level. The results of the studied showed that the color of acrylic resins denture base plate changed after immersion in sodium hypochlorite for 70 and 140 minutes and chlorhexidine for 105 and 210 minute of immersion.

  20. An investigation on the effects of different polymerization techniques on dimensional changes ofAcropars, an Iranian autopolymerizing acrylic resin

    Ebadian B

    2004-02-01

    Full Text Available Iranian product, Acropars autopolymerizing acrylic resin is nowadays widely used in"ndental prostheses. Dimensional change is a common problem among Iranian made acrylic resins in making"ncustom trays and record bases, seems to be more than the similar foreign products. In order to achieve a"ntechnique for making a record base with minimum dimensional changes, more research is necessary."nPurpose: The aim of the present study was to determine a curing technique for Iranian autopolymerizing"nacrylic resins leading to the least polymerization shrinkage and the most adaptation between record bases and"nstone casts."nMaterials and Methods: In this experimental study, 40 stone casts were divided into four 10- member group."nFor each group, polymerization shrinkage was determined at three points with one of the following"ntechniques: Bench curing, Curing under a coat of petroleum jelly , Curing in a monomer saturated"natmosphere, Curing in boiled water. Adaptation between bases and stone casts were measured at three points"n(the right and left crests of the ridge and the midpalatal region with a light-measuring microscope. To analyze"nthe data, Variance analysis was used."nResults: The monomer atmosphere technique showed the minimum dimensional changes and the samples in"nboiled water group had the maximum dimensional changes. No statistical differences were observed between"nother groups."nConclusion: More adaptation between record bases and stone casts was observed in monomer atmosphere"npolymerization technique. The differences between bench curing and curing under a coat of petroleum jelly"ntechniques with this method were not statistically significant. Therefore, it is suggested for making base"nrecords with maximum adaptation.

  1. Investigation of flexural strength and cytotoxicity of acrylic resin copolymers by using different polymerization methods

    Sahin, Onur; Ozdemir, Ali Kemal; Turgut, Mehmet; Boztug, Ali; Sumer, Zeynep

    2015-01-01

    PURPOSE The aim of this study was to appraise the some mechanical properties of polymethyl methacrylate based denture base resin polymerized by copolymerization mechanism, and to investigate the cytotoxic effect of these copolymer resins. MATERIALS AND METHODS 2-hydroxyethyl methacrylate (HEMA) and isobutyl methacrylate (IBMA) were added to monomers of conventional heat polymerized and injection-molded poly methyl methacrylate (PMMA) resin contents of 2%, 3%, and 5% by volume and polymerizati...

  2. Influence of acrylamide monomer addition to the acrylic denture-base resins on mechanical and physical properties

    Elif Aydogan Ayaz; Rukiye Durkan

    2013-01-01

    The aim of the study was to evaluate the effect of adding acrylamide monomer (AAm) on the characterization, flexural strength, flexural modulus and thermal degradation temperature of poly(methyl methacrylate) (PMMA) denture-base resins. Specimens (n510) were fabricated from a conventional heat-activated QC-20 (Qc-) and a microwave heat-activated Acron MC (Ac-) PMMA resins. Powder/liquid ratio followed the manufacturer’s instructions for the control groups (Qc-c and Ac-c) and for the copolymer groups, the resins were prepared with 5%(25), 10%(210), 15%(215) and 20%(220) acrylamide contents, according to the molecular weight ratio, respectively. The flexural strength and flexural modulus were measured by a three-point bending test. The data obtained were statistically analyzed by Kruskal-Wallis test (a50.05) to determine significant differences between the groups. The chemical structures of the resins were characterized by the nuclear magnetic resonance spectroscopy. Thermal stabilities were determined by thermogravimetric analysis (TGA) with a heating rate of 10 6C?min21 from 35 6C to 600 6C. Control groups from both acrylic resins showed the lowest flexural strength values. Qc-15 showed significant increase in the flexural strength when compared to Qc-c (P,0.01). Ac-10 and Ac-15 showed significance when compared to Ac-c (P,0.01). Acrylamide incorporation increased the elastic modulus in Qc-10, Qc-15 and Qc-20 when compared to Qc-c (P,0.01). Also significant increase was observed in Ac-10, Ac-15 and Ac-20 copolymer groups when compared to Ac-c (P,0.01). According to the 1H-nuclear magnetic resonance (NMR) results, acrylamide copolymerization was confirmed in the experimental groups. TGA results showed that the thermal stability of PMMA is increased by the insertion of AAm.

  3. Morphological alteration of microwave disinfected acrylic resins used for dental prostheses

    Popescu, M. C.; Bita, B. I.; Avram, A. M.; Tucureanu, V.; Schiopu, P.

    2015-02-01

    In this paper we aim to perform a cross section morphological characterization of an acrylic polymer used for dental prostheses subjected to microwave disinfection. The method was largely investigated and the microbiological effectiveness is well established, but there are some issues regarding the in-depth alteration of the material. In our research, the surface roughness is insignificant and the samples were not polished or refined by any means. Two groups of 7 acrylic discs (20 mm diameter, 2 mm thickness) were prepared from a heat-cured powder. Half of the samples embedded a stainless steel reinforcement, in order to observe the changes at the interfaces between the polymer and metallic wire. After the gradual wet microwave treatment, the specimens - including the controls - were frozen in liquid nitrogen and broken into pieces. Fragments were selected for gold metallization to ensure a good contrast for SEM imaging. We examined the samples in cross section employing a high resolution SEM. We have observed the alterations occurred at the surface of the acrylic sample and at the interface with the metallic wire along with the increase of the power and exposure time. The bond configuration of acrylate samples was analysed by FTIR spectrometry.

  4. Synthesis of wheat straw cellulose-g-poly (potassium acrylate)/PVA semi-IPNs superabsorbent resin.

    Liu, Jia; Li, Qian; Su, Yuan; Yue, Qinyan; Gao, Baoyu; Wang, Rui

    2013-04-15

    To better use wheat straw and minimize its negative impact on environment, a novel semi-interpenetrating polymer networks (semi-IPNs) superabsorbent resin (SAR) composed of wheat straw cellulose-g-poly (potassium acrylate) (WSC-g-PKA) network and linear polyvinyl alcohol (PVA) was prepared by polymerization in the presence of a redox initiating system. The structure and morphology of semi-IPNs SAR were characterized by means of FTIR, SEM and TGA, which confirmed that WSC and PVA participated in the graft polymerization reaction with acrylic acid (AA). The factors that can influence the water absorption of the semi-IPNs SAR were investigated and optimized, including the weight ratios of AA to WSC and PVA to WSC, the content of initiator and crosslinker, neutralization degree (ND) of AA, reaction temperature and time. The semi-IPNs SAR prepared under optimized synthesis condition gave the best water absorption of 266.82 g/g in distilled water and 34.32 g/g in 0.9 wt% NaCl solution. PMID:23544572

  5. 丙烯酸改性PAE树脂性能的研究%A study on the properties of acrylic modified PAE resin

    2013-01-01

      用丙烯酸对PAE树脂进行改性,以期替代传统PAE树脂作为纸张的增强剂。探讨了在PAE树脂中引入丙烯酸的改性工艺及其应用,同时对改性PAE树脂的增强性能进行了研究。研究结果表明:在PAE树脂成品中引入9%的丙烯酸为最佳改性工艺,在此工艺条件下制备的改性PAE树脂对纸张的增强效果最佳;当改性PA E树脂用量为0.6%时,与使用1.0%传统PAE树脂的增强作用效果基本相当;另外在PAE树脂成品中引入丙烯酸,有利于PAE树脂成本的降低。研究成果对改性PAE树脂的研究、开发及应用具有较强的参考价值。%PAE resin was modified with acrylic resin, instead of traditional PAE resin as paper strengthening agent. The improvement process and its application for the combination of acrylic with PAE resin were discussed, as well as the performance of the modified PAE resin as paper strengthening agent. The results show that adding amount of 9%acrylic into the PAE resin can reach to the best strengthening effect; when dosage of modified PAE resin is 0.6%, the strengthening effect is equal to the traditional PAE resin at the dosage of 1.0%; in addition, adding acrylic into PAE resin can reduce the cost of the PAE resin. The results will provide as a reference on the research, development and application of modified PAE resin.

  6. STUDIES ON APPARENT KINETICS AND RHEOLOGICAL BEHAVIOR OF EPOXY/ACRYLATE IPNS AS VACUUM PRESSURE IMPREGNATION RESINS

    Jing-kuan Duan; Chonung Kim; Ping-kai Jiang

    2009-01-01

    The apparent kinetics and cure behavior of novel interpenetrating polymer networks (IPNs) based on cycloaliphatic epoxy resin (CER) and tri-functional acrylate have been investigated by means of differential scanning calorimetry (DSC) and Fourier transform infrared spectrosccpy (FT-IR). The results of DSC measurements show that the curing reaction of the TMPTMA component is much earlier than that of the CER component, which can lead to the formation of the IPNs. In contrast to neat anhydride-CER system, the anhydride-CER/TMPTMA systems exhibit relatively lower curing temperatures. The activation energy for initiating the reaction of the anhydride-CER system slightly increases, whereas the activation energy for propagating the reaction markedly reduces during the full IPNs formation. The FF-IR spectroscopic changes are interpreted in terms of curing mechanism of CER and TMPTMA components. The extent of reaction is calculated from FT-IR absorption bands, which depends on the reactive group concentration. The experimental results of FT-IR measurements are in good agreements with those of DSC measurements. The theological behavior of anhydride-CER/TMPTMA systems during IPNs formation is studied in this paper. It is confirmed that the introduction of TMPTMA monomer into anhydride-epoxy resin has significant effects on the theological behavior of the system.

  7. 详解丙烯酸树脂化工材料在纺织印染中的应用%Exposition on acrylic resin chemical industry material applied in textile printing and dyeing

    肖九梅

    2015-01-01

    丙烯酸树脂是指丙烯酸酯或甲基丙烯酸树脂通过自由基聚合反应生成的均聚物或与其他烯类单体生成的共聚物,具有优异的耐光性及抗户外老化性能.其突出优点是耐候性好,主要用作面漆.针对丙烯酸树脂的组成特性与用途,介绍了丙烯酸树脂的分类,分别论述了热固性丙烯酸树脂和热塑性丙烯酸树脂的结构与性能特点以及水性丙烯酸烯树脂涂料,分析了纺织印染中的丙烯酸树脂化工材料,指出了丙烯酸树脂的技术开发与市场前景.%Acrylic resin refers to homopolymer or copolymer reacted with acrylate, methyl acrylic resin or other alkene monomers by free radical polymerization, which shows excellent light resistance and outdoor ageing performance. It is mainly used as a topcoat due to its outstanding weather resistance.The classification of acrylic resin was introduced according to the composition features and application of acrylic resin. The structural characteristics of thermosetting and thermoplastic acrylic resins as well as water-based acrylic resin coatings were discusses, respectively. The acrylic resin chemical industry materials used in textile printing and dyeing were also analyzed, and the technology development and market prospects of acrylic resin were pointed out.

  8. The use of epoxidised palm oil products (EPOP) for the synthesis of radiation curable resins. II. Ultraviolet (UV) curing of epoxidised RBD palm oil acrylate (EPOLA)

    Epoxidised RBD palm olein acrylate (EPOLA) and polyurethane acrylate (PUA) prepared at UTN laboratory were used as base polymers or oligomers in the formulations of ultraviolet (UV) curable resins. Mono-, di- and trifunctional monomers were utilized both as crosslinkers as well as for diluents. Curing was done by means of 20 cm wide IST UV machine with the conditions of 8A current and 4m/min conveyor speed. The properties of the cured films were investigated by using pencil hardness tester and gel content analysis

  9. Synthesis of Acrylic Resin for Coloring Agent%PU合成革着色剂用丙烯酸树脂的合成

    王晓航

    2001-01-01

    The solution polymerization of acrylic component in toluene is carried out by taking peroxide dibenzoyl as the initiator, to give acrylic resin which may be used as the medium or carrier in the manufacture of coloring agent for PU synthetic leather.%丙烯酸类单体于甲苯溶剂中,以过氧化二苯甲酰作引发剂进行溶液聚合,制得的丙烯酸树脂作为介质或载体,应用于PU合成革着色剂的制造中。

  10. Selective removal of nitrate by using a novel macroporous acrylic anion exchange resin

    Hai Ou Song; Yang Zhou; Ai Min Li; Sandra Mueller

    2012-01-01

    An anion exchange resin NDP-5 has been prepared successfully and applied on the selective removal of nit-ate from SO42-/NO3- binary co-existence system.The composition and morphology of NDP-5 were confirmed by FT-IR and SEM.The NDP-5 resin exhibits the completely different behavior on the adsorption capacity,adsorption kinetic and the effect of the completing anion in the absence or presence of sulfate,compared to D213.And,the resultants of kinetic are well fitted by the pseudo-first-order and pseudo-second-order models.These results are very important to develop novel resins with great features.

  11. Factors affecting the bond strength of denture base and reline acrylic resins to base metal materials

    Naomi Tanoue

    2013-07-01

    Full Text Available OBJECTIVE: The shear bond strengths of two hard chairside reline resin materials and an auto-polymerizing denture base resin material to cast Ti and a Co-Cr alloy treated using four conditioning methods were investigated. MATERIAL AND METHODS: Disk specimens (diameter 10 mm and thickness 2.5 mm were cast from pure Ti and Co-Cr alloy. The specimens were wet-ground to a final surface finish of 600 grit, air-dried, and treated with the following bonding systems: 1 air-abraded with 50-70-µm grain alumina (CON; 2 1 + conditioned with a primer, including an acidic phosphonoacetate monomer (MHPA; 3 1 + conditioned with a primer including a diphosphate monomer (MDP; 4 treated with a tribochemical system. Three resin materials were applied to each metal specimen. Shear bond strengths were determined before and after 10,000 thermocycles. RESULTS: The strengths decreased after thermocycling for all combinations. Among the resin materials assessed, the denture base material showed significantly (p<0.05 greater shear bond strengths than the two reline materials, except for the CON condition. After 10,000 thermocycles, the bond strengths of two reline materials decreased to less than 10 MPa for both metals. The bond strengths of the denture base material with MDP were sufficient: 34.56 MPa for cast Ti and 38.30 for Co-Cr alloy. CONCLUSION: Bonding of reline resin materials to metals assessed was clinically insufficient, regardless of metal type, surface treatment, and resin composition. For the relining of metal denture frameworks, a denture base material should be used.

  12. Acrylic resins. Part II. Methacrylate polymers (citations from NTIS data base). Report for 1964--Mar 1976

    Polymethyl methacrylate, polymethacrylic acid, and all other methacrylate and methacrylic polymers, copolymers, and resins are covered in Part 2 of this bibliography. The citations include references concerning physical, chemical, and mechanical properties, synthesis, polymerization and processing. (This updated bibliography contains 172 abstracts, 25 of which are new entries to the previous edition.)

  13. Research process in synthesis of water-borne acrylic resin modified by epoxy resin%环氧树脂改性水性丙烯酸树脂的研究进展

    陈涛

    2011-01-01

    环氧树脂改性水性丙烯酸树脂是目前水性丙烯酸树脂领域的研究热点,改性后可有效弥补传统水性丙烯酸树脂的诸多缺点。文章简述了传统水性丙烯酸树脂的不足,根据水性丙烯酸树脂的改性原理,重点介绍了冷拼改进法、酯化改进法、接枝共聚改进法的现状,并对环氧树脂改性水性丙烯酸树脂的发展进行了展望。%Synthesis of water-borne acrylic resin modified by epoxy resin is one of the most activefields in water-borne acrylic resin field, and it can effectively reduce the drawbacks produced fromthe traditional water-borne acrylic resin. In this paper, mechanica

  14. PHOTOCURING STUDY OF NEW DENTAL RESINS BASED ON MULTIFUNCTIONAL ACRYLIC ISOCYANURATE BY PHOTOCALORIMETRY

    Jun Nie; Wen-hui Zhou; Miao-zhen Li; Er-jian Wang; L.A. Linden; J.F. Rabek

    1999-01-01

    Photocuring of new dental resins composed of tri(2-hydroxyethyl) isocyanurate triacrylate (THITA)alone and its mixtures with trimethylolpropane triacrylate (TMPTA) or pentaerythritol triacrylate (PETA) initiated by camphorquinone/amine system was studied by photocalorimetry. Among several different amines as coinitiators, 2-ethyl-4-dimethylaminobenzoate (AM-3), N,N-dimethylbenzylamine (AM-5) and 2,4,6-[tri(dimethylaminomethyl)]phenol (AM-6) are most effective. Upon irradiation, photopolymerization can occur immediately and no induction period appears in N2 nor in air. Comparing the THITA/TMPTA and THITA/PETA mixtures, the parameters of photopolymerization and hardness of photocured samples show a small difference and only change slightly with varying molar ratios of mixture. In the presence of inorganic filler, the hardness of photocuring resins is almost the same as that for commercial products.

  15. Preparation and Characterization of Two-component Waterborne Polyurethane Comprised of Water-soluble Acrylic Resin and HDI Biuret%水性双组份丙烯酸聚氨酯的合成与表征

    周新华; 涂伟萍; 胡剑青

    2006-01-01

    A two-component waterborne polyurethane (2K-WPU) was prepared by mixing water-soluble acrylic resin and hexamethylene diisocyanate biuret, and then diluted for phase inversion with water. Compared with water-soluble acrylic resin, the phase inversion of 2K-WPU occurs at lower water content. It is indicated by TEM that 2K-WPU particles show a core-shell structure, in which HDI biuret is encapsulated by hydrophilic acrylic resin. 2K-WPU emulsion with HDI biuret has larger particle size and narrower distribution index, while for 2K-WPU emulsion with HDI isocyanurate, the latex not only has large particle size, but also has two-peak distribution. FTIR shows that the reaction between HDI biuret and acrylic resin can complete in 12h. In addition, studies on effect of composition of acrylic resin on pefformance of 2K-WPU show that narrowing the polar difference between water-soluble acrylic resin and HDI biuret and improving the miscibility of two components are the key to prepare the transparent and high gloss films with high crosslinking density.

  16. Properties of Transparent Conductive Film with Acrylic Resin Coating%丙烯酸树脂涂层对透明导电薄膜整体性能的影响

    张官理; 伍建华; 霍钟祺; 张晓锋

    2011-01-01

    在有机玻璃(Polymethyl Methacrylate,PMMA)上磁控溅射透明导电金属薄膜,并引入丙烯酸树脂底涂层和面涂层,以期提高透明导电薄膜的耐环境性能,研究了涂层的引入对透明导电膜整体性能的影响.结果表明:引入丙烯酸树脂涂层后,透明导电薄膜的耐环境性能有了明显提高,且丙烯酸树脂涂层由于具有较低折射率,还可作为光学增透层使用;丙烯酸树脂涂层的引入对成膜质量也有一定的改善.%The acrylic resin coating was used before and after magnetic sputtering of transparent conductive film on the PMMA to improving environmental resistance. The properties of transparent conductive film with acrylic resin coating were inquired. The results showed that the environmental resistance of transparent conductive film was significantly improved after using the acrylic resin coating. The acrylic resin coating could be used as a antireflection layer because of its low refractive index. The quality of film sputtering on the acrylic resin coating was improved as the using of acrylic resin coating.

  17. Effect of Zirconium Oxide Nano-Fillers Addition on the Flexural Strength, Fracture Toughness, and Hardness of Heat-Polymerized Acrylic Resin

    Mohamed Ashour Ahmed; Mohamed I. Ebrahim

    2014-01-01

    Purpose: The mechanical strength of polymethyl methacrylate (PMMA) remains far from ideal for maintaining the longevity of denture. The purpose of this study was to evaluate the effect of Zirconium oxide (ZrO2) nanofillers powder with different concentration (1.5%, 3%, 5% and 7%) on the flexural strength, fracture toughness, and hardness of heat-polymerized acrylic resin. Materials and methods: Zirconium oxide powders with different concentrations (1.5%, 3%, 5% and 7%) were incorporated ...

  18. Evaluation of efficacy of commercial denture cleansing agents to reduce the fungal biofilm activity from heat polymerized denture acrylic resin: An in vitro study

    Mithilesh M Dhamande

    2012-01-01

    Full Text Available Aims: To compare and evaluate Candida removing effects of three most commonly available varieties of commercial denture cleansers from heat polymerized acrylic resins. To compare and evaluate Candida lytic effects of denture cleansers. To assess the effect of time on ability of denture cleansers in reducing Candidal biofilm. Materials and Methods: A specially designed metal mold was fabricated to obtain wax plates of uniform dimensions which were used to fabricate heat cure acrylic resin plates. A square-shaped window of dimension 15 mm and thickness of 1.5 mm was provided in metal mould to simulate thickness of denture base. All samples used in this study were prepared using this mould. Candida albicans colonies were then cultured on this acrylic resin plates by colonization assay. Yeast removing test for samples was performed using microscope and yeast lytic test was performed using photo colorimeter. Results: Denture cleanser D2 showed the highest Candida removing activity when compared with cleansers D1, D3, and control solution. Denture cleansers D2 showed increased yeast lytic ability when compared with denture cleansers D1, D3, and control solution. More time span shared a definite influence on yeast lytic ability of denture cleansers. Conclusions: The effect of cleansing agents on removal of colonized yeasts particularly fungal biofilm from acrylic resins was assessed for clinical implications. The observation indicated superior performance of cleanser D2 when compared with D1 and D3 even though they all belong to same chemical group of alkaline peroxide. The increased effectiveness may be due to presence of sodium lauryl sulphate in formula of D2.

  19. Current research progress of organofluorine modified acrylate resin%有机氟改性丙烯酸酯树脂研究新进展

    刘建峰; 肖新颜

    2012-01-01

    Several chemical modification methods for preparation of organofluorine' modified acrylate resin and their cunnt research progress were reviewed. These methods include conventional emulsion polymerization, core-shell emulsion polymerization, and emulsifier-free emulsion polymerization. The application status of organofluorine-modified acrylate resin in the field of exterior wall coatings and anticorrosive/antifouling coatings were summarized. The development prospect of organofluorine-kmodified acrylate resin was presented.%综述了有机氟改性丙烯酸酯树脂的化学改性制备方法(如常规乳液聚合、核壳乳液聚合和无皂乳液聚合等)及其研究新进展,总结了有机氟改性丙烯酸酯树脂在外墙涂料、防腐防污涂料等领域的应用现状,并展望了该研究领域的发展前景.

  20. The pH effect of solvent in silanization on fluoride released and mechanical properties of heat-cured acrylic resin containing fluoride-releasing filler.

    Nakornchai, Natha; Arksornnukit, Mansuang; Kamonkhantikul, Krid; Takahashi, Hidekazu

    2016-01-01

    This study aimed to evaluate the effect of an acidic-adjusted pH of solvent in silanization on the amount of fluoride released and mechanical properties of heat-cured acrylic resin containing a silanized fluoride-releasing filler. The experimental groups were divided into 4 groups; non-silanized, acidic-adjusted pH, non-adjusted pH, and no filler as control. For fluoride measurement, each specimen was placed in deionized water which was changed every day for 7 days, every week for 7 weeks and measured. The flexural strength and flexural modulus were evaluated after aging for 48 h, 1, and 2 months. Two-way ANOVA indicated significant differences among groups, storage times, and its interaction in fluoride measurement and flexural modulus. For flexural strength, there was significant difference only among groups. Acidic-adjusted pH of solvent in silanization enhanced the amount of fluoride released from acrylic resin, while non-adjusted pH of solvent exhibited better flexural strength of acrylic resin. PMID:27252000

  1. Effect of metal priming agents on bonding characteristics of an acrylic resin joined to SUS XM27 steel.

    Ishikawa, Yumi; Kawamoto, Yoshikazu; Koizumi, Hiroyasu; Furuchi, Mika; Matsumura, Hideo; Tanoue, Naomi

    2006-12-01

    The purpose of the current study was to evaluate the effect of functional monomers contained in the primers on adhesive bonding of a steel alloy. SUS XM27 steel was primed with one of the following materials; Alloy Primer, Estenia Opaque Primer, and V-Primer. The functional monomers in the primers were a phosphate (10-methacryloyloxydecyl dihydrogen phosphate; MDP) and a thione (6-(4-vinylbenzyl-n-propyl) amino-1,3,5-triazine-2,4-dithione, -dithiol tautomer; VTD) for Alloy Primer, MDP alone for Estenia, and VTD alone for V-Primer. The steel disks were bonded with an acrylic resin (Unifast Trad), and bond strength was determined. Of the three primers, both the Alloy Primer (33.3 MPa) and Estenia Opaque Primer (33.9 MPa) materials exhibited far better post-thermocycling bond strength than V-Primer (0 MPa). It can be concluded that the phosphate MDP is effective, whereas the thione VTD is ineffective for bonding SUS XM27 steel. PMID:17220619

  2. Comparison of the dimensional stability of two waxes and two acrylic resin processing techniques in the production of complete dentures.

    Sykora, O; Sutow, E J

    1990-05-01

    Two base plate waxes and two denture processing techniques were independently compared for dimensional stability. Occlusion rims were constructed from extra hard and medium soft base plate waxes and teeth were set. Acrylic resin bases were processed by a trial packing technique, and a continuous injection system. Tooth movement was measured in the horizontal and vertical planes to assess wax and denture base dimensional changes at various steps in the process, and after 1, 3, and 8 weeks of denture base immersion in water at room temperature. Posterior palatal border adaptation, incisal pin opening and loss of centric occlusion contacts, were also measured. Results showed there were no significant differences between the two waxes as determined by tooth movement in the horizontal and vertical planes. In comparison to the trial packing technique, the continuous injection system showed significantly smaller changes for incisal pin opening and loss of centric occlusion, and better adaptation of the posterior palatal border to the cast. Measurement of tooth movement in the horizontal and vertical planes showed no significant differences between the two processing techniques for times prior to immersion in water, whereas after 8 weeks immersion the continuous injection technique showed smaller dimensional changes, relative to the original dimensions at the time of investing. PMID:2189970

  3. The effect of joint surface contours and glass fiber reinforcement on the transverse strength of repaired acrylic resin: An in vitro study

    Nayana Anasane

    2013-01-01

    Full Text Available Background : Denture fracture is an unresolved problem in complete denture prosthodontics. However, the repaired denture often experiences a refracture at the repaired site due to poor transverse strength. Hence, this study was conducted to evaluate the effect of joint surface contours and glass fiber reinforcement on the transverse strength of repaired acrylic resins. Materials and Methods: A total of 135 specimens of heat polymerized polymethyl methacrylate resin of dimensions 64 × 10 × 2.5 mm were fabricated. Fifteen intact specimens served as the control and 120 test specimens were divided into four groups (30 specimens each, depending upon the joint surface contour (butt, bevel, rabbet and round, with two subgroups based on type of the repair. Half of the specimens were repaired with plain repair resin and the other half with glass fibers reinforced repair resin. Transverse strength of the specimens was determined using three-point bending test. The results were analyzed using one-way ANOVA and Tukey post-hoc test (α= 0.05. Results: Transverse strength values for all repaired groups were significantly lower than those for the control group ( P < 0.001 (88.77 MPa, with exception of round surface design repaired with glass fiber reinforced repair resin (89.92 MPa which was significantly superior to the other joint surface contours ( P < 0.001. Glass fiber reinforced resin significantly improved the repaired denture base resins as compared to the plain repair resin ( P < 0.001. Conclusion: Specimens repaired with glass fiber reinforced resin and round surface design exhibited highest transverse strength; hence, it can be advocated for repair of denture base resins.

  4. Surface properties of multilayered, acrylic resin artificial teeth after immersion in staining beverages

    Karin Hermana NEPPELENBROEK

    2015-08-01

    Full Text Available AbstractObjective To evaluate the effect of staining beverages (coffee, orange juice, and red wine on the Vickers hardness and surface roughness of the base (BL and enamel (EL layers of improved artificial teeth (Vivodent and Trilux.Material and Methods Specimens (n=8 were stored in distilled water at 37°C for 24 h and then submitted to the tests. Afterwards, specimens were immersed in one of the staining solutions or distilled water (control at 37°C, and the tests were also performed after 15 and 30 days of immersion. Data were analyzed using 3-way ANOVA and Tukey’s test (α=0.05.Results Vivodent teeth exhibited a continuous decrease (p0.15, but red wine and orange juice continuously reduced hardness values (p0.06.Conclusions Hardness of the two brands of acrylic teeth was reduced by all staining beverages, mainly for red wine. Roughness of both layers of the teeth was not affected by long-term immersion in the beverages.

  5. Effects of alumina air-abrasion and acidic priming agents on bonding between SUS XM27 steel and auto-polymerizing acrylic resin.

    Ishikawa, Yumi; Ohashi, Norihisa; Koizumi, Hiroyasu; Tanoue, Naomi; Nishiyama, Norihiro; Matsumura, Hideo

    2007-09-01

    The purpose of this study was to evaluate the effects of functional monomers contained in the primers, as well as alumina particle abrasion on bonding between stainless steel and acrylic resin. SUS XM27 steel was primed with one of the following materials; Alloy Primer, Estenia Opaque Primer, M. L. Primer, and Super-Bond Liquid. Steel disks were either ground flat or alumina-blasted, primed with one of the four agents, and bonded with an acrylic resin (Unifast Trad). Bond strength was determined both before and after thermocycling (2,000 or 20,000 cycles). Among the four priming agents, the Alloy Primer and Estenia Opaque Primer, both of which contain 10-methacryloyloxydecyl dihydrogen phosphate (MDP), exhibited better bonding performance than the others. Alumina air-borne particle abrasion considerably improved the durability of bonding between the steel and the resin material. It can be concluded that alumina blasting followed by priming with an MDP agent is recommended for bonding the resin and SUS XM27 steel. PMID:17928724

  6. Effects of Laboratory Disinfecting Agents on Dimensional Stability of Three Commercially Available Heat-Cured Denture Acrylic Resins in India: An In-Vitro Study

    Jujare, Ravikanth Haridas; Varghese, Rana Kalappattil; Singh, Vishwa Deepak; Gaurav, Amit

    2016-01-01

    Introduction Dental professionals are exposed to a wide variety of microorganisms which calls for use of effective infection control procedures in the dental office and laboratories that can prevent cross-contamination that could extend to dentists, dental office staff, dental technicians as well as patients. This concern has led to a renewed interest in denture sterilization and disinfection. Heat polymerized dentures exhibit dimensional change during disinfection procedure. Aim The purpose of this study was to determine the influence of different types of widely used laboratory disinfecting agents on the dimensional stability of heat-cured denture acrylic resins and to compare the dimensional stability of three commercially available heat-cured denture acrylic resins in India. Materials and Methods Twelve specimens of uniform dimension each of three different brands namely Stellon, Trevalon and Acralyn-H were prepared using circular metal disc. Chemical disinfectants namely 2% alkaline glutaraldehyde, 1% povidone-iodine, 0.5% sodium hypochlorite and water as control group were used. Diameter of each specimen was measured before immersion and after immersion with time interval of 1 hour and 12 hours. The data was evaluated statistically using one way analysis of variance. Results All the specimens in three disinfectants and in water exhibited very small amount of linear expansion. Among three disinfectants, specimens in 2% alkaline glutaraldehyde exhibited least(0.005mm) and water showed highest (0.009mm) amount of dimensional change. Among resins, Trevalon showed least (0.067mm) and Acralyn-H exhibited highest (0.110mm) amount of dimensional change. Conclusion Although, all the specimens of three different brands of heat-cured denture acrylic resins exhibited increase in linear dimensional change in all the disinfectants and water, they were found to be statistically insignificant. PMID:27134996

  7. Flame retardancy and thermal properties of epoxy acrylate resin/alpha-zirconium phosphate nanocomposites used for UV-curing flame retardant films

    This paper reported the UV-curing flame retardant film, which consisted of epoxy acrylate resin (EA) used as an oligomer, tri(acryloyloxyethyl) phosphate (TAEP) and triglycidyl isocyanurate acrylate (TGICA) used as flame retardant (FR). The flame retardancy and thermal properties of films were reinforced by using alpha-zirconium phosphate (α-Zr (HPO4)2H2O, α-ZrP). The morphology of nanocomposite film was characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results showed that the organophilic α-ZrP (OZrP) layers were dispersed well in epoxy acrylate resin. Microscale Combustion Calorimeter (MCC), thermogravimetric analysis (TGA) and thermogravimetric analysis/infrared spectrometry (TGA-IR) were used to characterize the flame retardant property and thermal stability. It was found that the incorporation of TAEP and TGICA can reduce the flammability of EA. Moreover, further reductions were observed due to the addition of OZrP. The char residue for systems with or without OZrP was also explored by scanning electron microscopy (SEM).

  8. 环氧丙烯酸酯树脂的制备及其聚氨酯改性%Preparation of epoxy acrylate resin and its Polyurethane modification

    庄彩虹; 王晖; 尹健; 刘海霞; 张贤超; 池漪

    2012-01-01

    An epoxy acrylic resin was prepared by epoxy resin with acrylic acid as modifier. The effect of catalyst type on modification process was evaluated by single factor experiment. The effects of reaction temperature, catalyst content and polymerization inhibitor content on modification process were investigated by orthogonal experiment. Modification of epoxy acrylic resin using homemade polyurethane prepolymer was studied. The effects of polyurethane addition and epoxy resin types on the performances of composite material were investigated. The results show that the optimum reaction condition of preparing epoxy acrylic resin is obtained when the mass fraction of N,N-dimethylaniline as catalyst is 2%, reaction temperature is 110 ℃ and the mass fraction of polymerization inhibitor is 0.1%. The characterization of FT-IR illustrates that epoxy acrylic resin is prepared. Meanwhile the mechanical properties of materials are obviously improved by using homemade polyurethane. When the amount of polyurethane prepolymer (n(-NCO):n(-OH)=2:1) is 25%, the compressive strength of material improves by 59.33% and the tensile shear strength increases 3.7 times. The scanning electron micrographs of material sections indicate that the modified material appears in the characteristic of toughness material. In addition, the performances of the composite prepared by bisphenol-F-epoxy resin are obviously superior to the composite prepared by bisphenol-A-epoxy resin.%采用丙烯酸对环氧树脂进行改性制备环氧丙烯酸酯,通过单因素实验考察催化剂种类对改性工艺条件的影响;设计正交实验探讨反应温度、催化剂用量及阻聚剂用量对改性工艺条件的影响.采用自制的聚氨酯预聚体对环氧丙烯酸酯进行改性研究,考察聚氨酯预聚体的添加及环氧树脂种类对复合材料性能的影响.研究结果表明:制备环氧丙烯酸酯的最佳反应条件为:以N,N-二甲基苯胺为催化剂,反应温度110

  9. Preparation and research of water-borne hydroxyl acrylic resin%水性羟基丙烯酸树脂的制备与研究

    袁腾; 王锋; 胡剑青; 涂伟萍; 周显宏

    2013-01-01

    The water - borne hydroxyl acrylic resin was prepared by semi - continuous solution polymerization technology using methyl methacrylate (MMA) , styrene(St) , and butyl acrylate (BA) as main monomers, acrylic acid (AA), hydroxyethyl acrylate (HEA)and isobornyl methacrylate (IBOMA) as functional monomers and finally adding water for dispersion . The effects of monomer ratio, initiator (BPO) amount, temperature, chain transfer a-gent ( DDM) amount and functional monomer amount on the properties of resin were investigated by FT - IR, transparency analysis and viscosity analysis. The results showed that when the mass fraction of AA, HEA, IBOMA, BPO and DDM were 3% , 12% , 10% , 3% and 2% , respectively, and polymerization reaction temperature was 100 ℃, the aqueous hydroxy acrylic resin was obtained with viscosity 5 Pa·s and solids content about 45%.%以甲基丙烯酸甲酯(MMA)、苯乙烯(St)和丙烯酸丁酯(BA)等为主要单体,引入丙烯酸(AA)、丙烯酸羟基乙酯(HEA)与甲基丙烯酸异冰片酯(IBOMA)等作为功能单体,通过半连续溶液聚合工艺,最后加水分散制得水性羟基丙烯酸树脂.利用FT-IR、透光度、粘度分析研究了单体配比、引发剂(BPO)用量、温度、链转移剂(DDM)用量、功能单体用量等因素对树脂性能的影响.结果表明,当AA、HEA、IBOMA、BPO和DDM的质量分数分别为3%、12%、10%、3%和2%,聚合反应温度100℃时可获得粘度为5 Pa·s,固含量约45%的水性羟基丙烯酸树脂.

  10. 聚氨酯-丙烯酸酯树脂颗粒的研究%Study on HEA- terminated polyurethane macromonomer-acrylate resin particles

    孙卫红; 晏欣

    2011-01-01

    制备了丙烯酸羟乙酯(HEA)封端的聚氨酯大分子单体(PUA),并采用悬浮聚合法合成了一系列聚氨酯-丙烯酸酯树脂颗粒,分析了分散剂用量及种类对颗粒大小的影响;热重分析表明聚氨酯-聚甲基丙烯酸乙酯(PUA - PEMA)树脂的起始分解温度为230.5℃;采用SEM表征了树脂的表面形貌;溶胀性能测试表明PUA- PEMA和聚氨酯-苯乙烯(PUA/PSt)2种树脂对甲苯均有良好的吸附性能,在5 min时的吸附率分别达到了3.38 g/g和4.28 g/g,PUA- PSt树脂对有毒单体甲苯和氯仿的溶胀率为255%和330%.%Polyurethane acrylate(PUA) macromonomer was synthesized and its copolymer particles with acrylate and styrene(St) were prepared by suspension polymerization. The influence of dispering agent on synthesis of particles was studied. TG test showed the origin decomposition temperature of PUA/PEMA resin is 230. 5 ℃; the results of SEM showed the surface topography of synthetical resin particles;swelling ability test showed that PUA/PEMA and PUA/PSt resins have good absorption ability to methylbenzene, the absorption rate were 3. 38 g/g(PUA/PEMA) and 4. 28 g/g (PUA/PSt) in 5 min respectively. The absorption ablity of PUA/PSt resins to methylbenzene and chloroform were 255% and 330% respectively.

  11. Effect of silver-supported materials on the mechanical and antibacterial properties of reinforced acrylic resin composites

    Highlights: • The novel Novaron-nano-ZrO2–ABW/PMMA composites was synthesized. • Nano-ZrO2 and ABWs could increase the mechanical behavior of this composites. • Novaron had synergistic effect to improve the composites mechanical property and the 4 wt% was the optimal proportion. • Novaron could improve the antibacterial properties through their direct contact with the bacteria. • The composites did not have an adverse affect on cell viability. - Abstract: The aim of this study was to investigate the effect of silver-supported material (Novaron (N)) in acrylic resin (poly(methyl methacrylate) (PMMA)) composites, which reinforced with zirconium dioxide nanoparticles (nano-ZrO2) and aluminum borate whiskers (ABWs), on the mechanical behavior, antibacterial properties and cytotoxicity. Silanized ABWs (4 wt%) and nano-ZrO2 (2 wt%) were mixed with PMMA powder to obtain nano-ZrO2–ABW/PMMA matrices. Various amounts of Novaron particles were incorporated into the matrices and the pure PMMA to test the flexural strength. In addition, Streptococcus mutans (S. mutans) and Canidia albicans (C. albicans) biofilms on the specimen surface and in the culture medium were investigated for metabolic activity and colony-forming units (CFUs). Extracts taken in the cell culture medium of the specimens were used to evaluate cell viability. Results showed that the silanized nano-ZrO2 and ABWs could improve the flexural strength of composites compared with the pure PMMA. Novaron itself had no mechanical function for composites while it had synergistic effect when it mixed with silanized nano-ZrO2 and ABWs. And when 4 wt% (N-4) Novaron mixed in nano-ZrO2–ABW/PMMA composites, flexural strength achieved an increase of 44%, getting the maximum value. For the antibacterial properties, the values of MTT and CFUs of S. mutans and C. albicans biofilms on the composites surface were greatly reduced (p < 0.05) with the higher proportion of Novaron, and no significant difference was

  12. Effect of nonthermal plasma treatment on surface chemistry of commercially-pure titanium and shear bond strength to autopolymerizing acrylic resin.

    Vechiato-Filho, Aljomar José; da Silva Vieira Marques, Isabella; dos Santos, Daniela Micheline; Matos, Adaias Oliveira; Rangel, Elidiane Cipriano; da Cruz, Nilson Cristino; Barão, Valentim Adelino Ricardo

    2016-03-01

    The effect of nonthermal plasma on the surface characteristics of commercially pure titanium (cp-Ti), and on the shear bond strength between an autopolymerizing acrylic resin and cp-Ti was investigated. A total of 96 discs of cp-Ti were distributed into four groups (n=24): Po (no surface treatment), SB (sandblasting), Po+NTP and SB+NTP (methane plasma). Surface characterization was performed through surface energy, surface roughness, scanning microscopy, energy dispersive spectroscopy, and X-ray diffraction tests. Shear bond strength test was conducted immediately and after thermocycling. Surface treatment affected the surface energy and roughness of cp-Ti discs (P<.001). SEM-EDS showed the presence of the carbide thin film. XRD spectra revealed no crystalline phase changes. The SB+NTP group showed the highest bond strength values (6.76±0.70 MPa). Thermocycling reduced the bond strength of the acrylic resin/cp-Ti interface (P<.05), except for Po group. NTP is an effective treatment option for improving the shear bond strength between both materials. PMID:26706504

  13. Safety and Tolerability of Essential Oil from Cinnamomum zeylanicum Blume Leaves with Action on Oral Candidosis and Its Effect on the Physical Properties of the Acrylic Resin

    Julyana de Araújo Oliveira

    2014-01-01

    Full Text Available The anti-Candida activity of essential oil from Cinnamomum zeylanicum Blume, as well as its effect on the roughness and hardness of the acrylic resin used in dental prostheses, was assessed. The safety and tolerability of the test product were assessed through a phase I clinical trial involving users of removable dentures. Minimum inhibitory concentration (MIC and minimum fungicidal concentrations (MFC were determined against twelve Candida strains. Acrylic resin specimens were exposed to artificial saliva (GI, C. zeylanicum (GII, and nystatin (GIII for 15 days. Data were submitted to ANOVA and Tukey posttest (α=5%. For the phase I clinical trial, 15 healthy patients used solution of C. zeylanicum at MIC (15 days, 3 times a day and were submitted to clinical and mycological examinations. C. zeylanicum showed anti-Candida activity, with MIC = 625.0 µg/mL being equivalent to MFC. Nystatin caused greater increase in roughness and decreased the hardness of the material (P<0.0001, with no significant differences between GI and GII. As regards the clinical trial, no adverse clinical signs were observed after intervention. The substance tested had a satisfactory level of safety and tolerability, supporting new advances involving the clinical use of essential oil from C. zeylanicum.

  14. The Synthesis Method and Development Trend of Acrylic Modified Alkyd Resin%丙烯酸改性醇酸树脂合成方法及发展趋势

    王镇; 黄晓蕾

    2012-01-01

    综述了丙烯酸改性醇酸树脂的合成方法及应用。讨论了该类树脂的生产在新疆地区的可行性及发展趋势。%The synthesis method and application of acrylic modified alkyd resin were reviewed,and the feasibility and development trend of the modified resin in Xinjiang Region were discussed.

  15. POSS/丙烯酸树脂(PAA)的合成及固化机械性能%Synthesis and Curing Mechanical Properties of POSS/Acrylic Resin

    2013-01-01

    The POSS/acrylic resin was synthesized from N, N-dimethyl aniline as catalyst, and The cage epoxy polyhedral oligomeric silsesquioxanesand acrylic acid as raw materials, and the acrylic acid conversion influenced by the reaction temperature and the dosage of catalyst was discussed, get the synthesis EP-POSS acrylic resin better conditions, the structure and thermal properties of the POSS/acrylic resin was characterized by FTIR and TG and the curing mechanical performance to carry on the preliminary research.%  采用N,N-二甲基苯胺为催化剂,笼型倍半硅氧烷环氧树脂和丙烯酸为原料,合成了POSS/丙烯酸树脂,讨论了反应温度以及催化剂的用量对丙烯酸转化率的影响,得到了合成POSS/丙烯酸树脂的较佳条件,利用FTIR和热重分析(TG)对POSS/丙烯酸树脂的结构及热性能进行了表征,并对其固化机械性能进行了初步的研究。

  16. Development of radiation curable surface coating based on soybean oil. part II: Evaluation of the prepared acrylated resin as surface coatings by using EB or UV sources for radiation curing applications

    In recent years, there has been a growing trend in using vegetable oils as raw materials in acylation production that can be cured by UV/EB systems. The acrylated resin formulates by using individually different functional acrylate monomers were prepared and cured by EB or UV sources. The characterization properties of the cured films were investigated in terms of pendulum hardness, bending, impact, gloss, adhesion and chemical tests. Other formulations were prepared by mixing a constant ratio of different functional acrylate monomers and exposed to UV or EB irradiation. The results showed that the hardness of cured films were increased by increasing the functionality of monomers with excellent adhesion for all formulations but at expense of other properties involving bending and impact tests. Therefore, it can be deduce that the hardness of the curing surface coating by using EB was found to be nearly twice the hardness of the curing surface coating by using UV irradiation. Also, the best formulations which have given good chemical and mechanical properties are (mono-di) functional acrylate monomer resin under EB and (mono-tri) functional acrylate monomer resin under UV irradiation

  17. Argon Ion Laser Polymerized Acrylic Resin: A Comparative Analysis of Mechanical Properties of Laser Cured, Light Cured and Heat Cured Denture Base Resins

    Murthy, S. Srinivasa; Murthy, Gargi S

    2015-01-01

    Background: Dentistry in general and prosthodontics in particular is evolving at greater pace, but the denture base resins poly methyl methacrylate. There has been vast development in modifying chemically and the polymerization techniques for better manipulation and enhancement of mechanical properties. One such invention was introduction of visible light cure (VLC) denture base resin. Argon ion lasers have been used extensively in dentistry, studies has shown that it can polymerize restorati...

  18. Study of Synthesis and Characteristics of the High Solids Fluorine-containing Acrylic Resin%高固体份含氟丙烯酸酯树脂的合成及性能研究

    张耀根; 蒋海林

    2012-01-01

    A kind of fluorine hydroxyl acrylate resin is synthesized by solution free radical polymerization with acrylic monomers and fluoride acrylic monomers.The effects of polymerization temperature,type of initiators,fluoride monomers and hydroxyl value on molecular weight,viscosity and properties of the resin are researched.This fluorine hydroxyl acrylate resin with lower molecular weight(Mn6000,Mw/Mn1.5,hydroxyl content30 mg/g)can be obtained under the optimal reaction condition,which has obviously low viscosity and high solid content.With HDI(N75) as hardener,according to 1∶5,this resin coating is cured at room temperature,which performances are better than ordinary acrylic polyurethane resin coating.%通过丙烯酸酯类单体与含氟丙烯酸单体的溶液聚合,制备了高固体份低粘度的含氟多羟基丙烯酸树脂。讨论了反应温度、引发剂、氟单体、羟基值等因素对树脂分子量、黏度以及性能的影响。通过优化条件,结果表明制备的含氟丙烯酸树脂,数均分子量小于6000,分子量分布〈1.5,羟基含量〉30 mgKOH/g,高固体份低粘度特性显著。通过与固化剂N75按质量比1∶5配制成涂料,常温固化成膜后,测定其各项性能均优于普通丙烯酸聚氨酯树脂涂料。

  19. Modeling of a Buss-Kneader as a Polymerization Reactor for Acrylates. Part II: Methyl Methacrylate Based Resins

    Janssen, L.P.B.M.; Dierendonck, L.L. van; Troelstra, E. J.; Renken, A.

    2002-01-01

    The Buss-Kneader has proven to be a suitable reactor for the polymerization of acrylates. In this second part, the polymerization of methyl methacrylate and the ter- polymerization of methyl methacrylate (MMA), hydroxyethyl methacrylate and n-butylmethacrylate is carried out in a pilot Buss-Kneader. The reactor had to be pressurized up to about 10 bars to avoid evaporation of MMA. Instabilities in output rate and temperature profiles were observed as a result of fluctuating the pressures. Bec...

  20. Photocurable bioactive bone cement based on hydroxyethyl methacrylate-poly(acrylic/maleic) acid resin and mesoporous sol gel-derived bioactive glass.

    Hesaraki, S

    2016-06-01

    This paper reports on strong and bioactive bone cement based on ternary bioactive SiO2-CaO-P2O5 glass particles and a photocurable resin comprising hydroxyethyl methacrylate (HEMA) and poly(acrylic/maleic) acid. The as-cured composite represented a compressive strength of about 95 MPa but it weakened during soaking in simulated body fluid, SBF, qua its compressive strength reached to about 20 MPa after immersing for 30 days. Biodegradability of the composite was confirmed by reducing its initial weight (~32%) as well as decreasing the molecular weight of early cured resin during the soaking procedure. The composite exhibited in vitro calcium phosphate precipitation in the form of nanosized carbonated hydroxyapatite, which indicates its bone bonding ability. Proliferation of calvarium-derived newborn rat osteoblasts seeded on top of the composite was observed during incubation at 37 °C, meanwhile, an adequate cell supporting ability was found. Consequently, it seems that the produced composite is an appropriate alternative for bone defect injuries, because of its good cell responses, high compressive strength and ongoing biodegradability, though more in vivo experiments are essential to confirm this assumption. PMID:27040248

  1. Performance optimization and applieation of vinyl chloride-butyl acrylate copolymer resin%氯乙烯-丙烯酸丁酯共聚树脂的性能优化及应用

    宋晓玲; 贺盛喜; 黄东

    2012-01-01

    通过调整生产工艺或聚合配方,对氯乙烯-丙烯酸丁酯共聚树脂(以下简称氯丙树脂)中丙烯酸丁酯的含量及分布,氯丙树脂的分子质量及其分布、颗粒特性、热稳定性进行了优化;比较了优化后的氯丙树脂与普通PVC树脂的加工性能和力学性能,并将其应用于PVC型材和注塑管件的生产。结果表明:①氯丙树脂中丙烯酸丁酯的质量分数以5%~10%为宜;②通过调整生产工艺或聚合配方,可制得丙烯酸丁酯分布均匀、分子质量分布集中、粒度分布集中、热稳定性优良的氯丙树脂;③氯丙树脂可提高PVC树脂的加工性能和力学性能,可部分替代ACR或CPE等助剂;④经氯丙树脂改性生产的PVC型材和注塑管件性能合格,可简化注塑生产工艺,提高碳酸钙的用量,从而降低产品成本。%Through adjusting production process and polymerization formula, the content and distribution of butyl acrylate in vinyl chloride-butyl acrylate copolymer resin were optimized as well as the copolymer resin's molecular mass, molecular mass distribution, particle characteristics and heat stability. Vinyl chloride-butyl acrylate copolymer resins were compared with common PVC resins in processing and mechanical performances, and were applied to the production of PVC profiles and injection molding pipe fittings. The results showed that: ① the suitable content of bu- tyl acrylate in vinyl chloride-butyl acrylate copolymer resins were 5 wt% - 10 wt% ; ② through ad- justing production process and polymerization formula, vinyl chloride-butyl acrylate copolymer resins with uniform distribution of butyl acrylate, narrow distribution of relative molecular mass and particles size, and good heat stability could be prepared; ③ vinyl chloride-butyl acrylate copolymer resins could improve the processing and mechanical performances of PVC resins, and could partly replace additives ACR or CPE; ④ PVC profiles and injection

  2. Rapid removal of copper with magnetic poly-acrylic weak acid resin: Quantitative role of bead radius on ion exchange

    Highlights: • The equilibrium adsorption amount of Cu2+ onto NDMC was 267.2 mg/g. • Initial adsorption rate of NDMC was 4 and 8 times that of C106 and IRC-748. • External surface area was determined to be the key factor in rate-controlling. • Adsorption amount onto NDMC was not influenced by Na+ concentration. • 0.01 mM HCl solution could effectively desorb Cu2+. - Abstract: A novel magnetic weak acid resin NDMC was self-synthesized for the removal of Cu2+ from aqueous solutions. NDMC showed superior properties on the removal of Cu2+ compared to commercial resins C106 and IRC-748, which was deeply investigated by adsorption isotherms and kinetic tests. The equilibrium adsorption amount of Cu2+ onto NDMC (267.2 mg/g) was almost twice as large as that onto IRC-748 (120.0 mg/g). The adsorption kinetics of Cu2+ onto the three resins fitted well with the pseudo-second-order equation. The initial adsorption rate h of NDMC was about 4 times that of C106 and nearly 8 times that of IRC-748 at the initial concentration of 500 mg/L. External surface area was determined to be the key factor in rate-controlling by further analyzing the adsorption thermodynamics, kinetics parameters and physicochemical properties of the resins. NDMC resin with the smallest bead radius possessed the largest external surface and therefore exhibited the fastest kinetics. The adsorption amount of Cu2+ onto NDMC was not influenced as the concentration of Na+ increased from 1.0 to 10.0 mM/L. Dilute HCl solution could effectively desorb Cu2+. NDMC demonstrated high stability during 10 adsorption/desorption cycles, showing great potential in the rapid removal of Cu2+ from wastewater

  3. 丙烯酸树脂及涂料研究与开发的一些新进展%Some New Research and Development Progress of Acrylic Resin and Its Coatings

    刘国杰; 杨宝

    2012-01-01

    介绍了丙烯酸树脂及涂料的国内外发展概况;简述了氟硅与纳米等新材料、超支化、多重复合和双重交联等新技术对水性和UV固化的丙烯酸树脂的改性及趋势。%The general situation of research and development of the acrylic resin and coatings at home and abroad were introduced; the modification and development trend of fluorine silicon and nanotechnology and other new materials, hyperbranched, multiple compound and double cross linking and other new techniques in water-borne and UV curing acrylic resin were described briefly.

  4. Prótese intra-ocular de resina acrílica em cães e gatos Acrylic resin intraocular prosthesis in dogs and cats

    S.C. Rahal

    2000-08-01

    Full Text Available Foram atendidos no Hospital Veterinário da Faculdade de Medicina Veterinária e Zootecnia da Unesp - Campus de Botucatu, 11 animais (oito cães e três gatos, com alterações oftálmicas unilaterais graves que levaram à perda total da função ocular (protrusão de globo com injúria nervosa e estrutural, perfurações de córnea com perda de conteúdo intra-ocular e endoftalmites, entre outras. Os animais, com idades entre dois meses e 10 anos, foram submetidos à evisceração e posterior inclusão de esfera de resina acrílica (metilmetacrilato na capa córneo-escleral ou escleral. As esferas foram previamente confeccionadas e esterilizadas por autoclavagem. No pós-operatório foram utilizados antiinflamatórios e antibioticoterapia tópica combinada ou não a sistêmica. O período de observação variou de 2 meses a 3 anos e os aspectos avaliados foram secreção ocular, blefarospasmo, sinais de desconforto e estética. Obtiveram-se resultados satisfatórios em oito casos. Concluiu-se que a resina acrílica pode ser uma alternativa para uso como inclusão em cavidade anoftálmica.Eleven animals (eight dogs and three cats, aged between two months and ten years were referred to the Veterinary Hospital of Faculty of Veterinary Medicine and Animal Science - Unesp, Botucatu, Brazil. These animals presented severe unilateral ophthalmic changes that lead to a total loss of ocular function, such as prolapsed eyes with nervous and structural injury, corneal damage with loss of intraocular contents or endophthalmitis among others. They were submitted to evisceration followed by the insertion of an acrylic resin prosthesis (methylmethacrylate in the corneoscleral or scleral shell. The spheres were previously made and sterilized by autoclave. The postoperative medical therapy included topical and systemic broad-spectrum antibiotics for seven days and anti-inflammatory drugs. The follow-up time varied from two months to three years. The evaluated

  5. Rapid removal of copper with magnetic poly-acrylic weak acid resin: Quantitative role of bead radius on ion exchange

    Fu, Lichun; Shuang, Chendong; Liu, Fuqiang, E-mail: jogia@163.com; Li, Aimin, E-mail: liaimin@nju.edu.cn; Li, Yan; Zhou, Yang; Song, Haiou

    2014-05-01

    Highlights: • The equilibrium adsorption amount of Cu{sup 2+} onto NDMC was 267.2 mg/g. • Initial adsorption rate of NDMC was 4 and 8 times that of C106 and IRC-748. • External surface area was determined to be the key factor in rate-controlling. • Adsorption amount onto NDMC was not influenced by Na{sup +} concentration. • 0.01 mM HCl solution could effectively desorb Cu{sup 2+}. - Abstract: A novel magnetic weak acid resin NDMC was self-synthesized for the removal of Cu{sup 2+} from aqueous solutions. NDMC showed superior properties on the removal of Cu{sup 2+} compared to commercial resins C106 and IRC-748, which was deeply investigated by adsorption isotherms and kinetic tests. The equilibrium adsorption amount of Cu{sup 2+} onto NDMC (267.2 mg/g) was almost twice as large as that onto IRC-748 (120.0 mg/g). The adsorption kinetics of Cu{sup 2+} onto the three resins fitted well with the pseudo-second-order equation. The initial adsorption rate h of NDMC was about 4 times that of C106 and nearly 8 times that of IRC-748 at the initial concentration of 500 mg/L. External surface area was determined to be the key factor in rate-controlling by further analyzing the adsorption thermodynamics, kinetics parameters and physicochemical properties of the resins. NDMC resin with the smallest bead radius possessed the largest external surface and therefore exhibited the fastest kinetics. The adsorption amount of Cu{sup 2+} onto NDMC was not influenced as the concentration of Na{sup +} increased from 1.0 to 10.0 mM/L. Dilute HCl solution could effectively desorb Cu{sup 2+}. NDMC demonstrated high stability during 10 adsorption/desorption cycles, showing great potential in the rapid removal of Cu{sup 2+} from wastewater.

  6. Nanoporous nonwoven fibril-like morphology by cooperative self-assembly of poly(ethylene oxide)-block-poly(ethyl acrylate)-block-polystyrene and phenolic resin.

    Deng, Guodong; Qiang, Zhe; Lecorchick, Willis; Cavicchi, Kevin A; Vogt, Bryan D

    2014-03-11

    Cooperative self-assembly of block copolymers with (in)organic precursors effectively generates ordered nanoporous films, but the porosity is typically limited by the need for a continuous (in)organic phase. Here, a network of homogeneous fibrous nanostructures (≈20 nm diameter cylinders) having high porosity (≈ 60%) is fabricated by cooperative self-assembly of a phenolic resin oligomer (resol) with a novel, nonfrustrated, ABC amphiphilic triblock copolymer template, poly(ethylene oxide)-block-poly(ethyl acrylate)-block-polystyrene (PEO-b-PEA-b-PS), via a thermally induced self-assembly process. Due to the high glass transition temperature (Tg) of the PS segments, the self-assembly behavior is kinetically hindered as a result of competing effects associated with the ordering of the self-assembled system and the cross-linking of resol that suppresses segmental mobility. The balance in these competing processes reproducibly yields a disordered fibril network with a uniform fibril diameter. This nonequilibrium morphology is dependent on the PEO-b-PEA-b-PS to resol ratio with an evolution from a relatively open fibrous structure to an apparent poorly ordered mixed lamellae-cylinder morphology. Pyrolysis of these former films at elevated temperatures yields a highly porous carbon film with the fibril morphology preserved through the carbonization process. These results illustrate a simple method to fabricate thin films and coatings with a well-defined fiber network that could be promising materials for energy and separation applications. PMID:24548298

  7. Evaluation of the color durability of acrylic resin veneer materials after immersion in common beverages at different time intervals: A spectrophotometric study

    Shivani Kohli

    2015-06-01

    Full Text Available Background: Proper function, esthetics, and cost are the prime factors to be considered while selecting bridge veneering materials. The purpose of the study is to evaluate color durability of acrylic veneer materials after immersion in common beverages at different time intervals. Methods: Spectrophotometer was used for taking color measurements based on the transmission of light through the specimens made of the selected materials which were Tooth moulding powder (DPI and Acrylux (Ruthinium. Thirty specimens of standardized dimensions were prepared from each material. The specimens were divided into three groups of 10 each. One group of each material was immersed in tea (TajMahal and another group of each material in cola (Pepsi as the staining solutions. The remaining group of 10 from each material served as control and was stored in distilled water. Color measurements were obtained pre-immersion, and after 1, 15, and 30 days of immersion. Results: Tooth moulding powder displayed better color durability than Acrylux over the 1 month immersion period in both staining solutions. Tea resulted in more discoloration compared to cola (Pepsi. Conclusion: The difference in the color durability of Acrylux and Tooth moulding powder may be attributed to the differences in the composition of tested resin veneering materials, i.e. their polar properties, which contribute to the absorption of staining solution, and the different brands and the strengths of the solutions.

  8. Thermal and mechanical properties of a nanocomposite of a photocurable epoxy-acrylate resin and multiwalled carbon nanotubes

    Research highlights: → Carbon nanotubes promotes reinforcement in photocurable polymeric materials. → Curing degree in nanocomposites is an important issue for reinforcement. → Simple models are able to predict reinforcement in the nanocomposites. → Trends between nanohardness and microhardness measurements are very similar. - Abstract: In this work, thermal and mechanical behaviors of nanocomposites of a photocurable epoxyacrylate resin and multiwalled carbon nanotubes (MWCNT) were investigated. A combination of sonication, and mechanical and magnetic stirring was used to disperse 0.25 wt% and 0.75 wt% of MWCNTs into the resin. Two photocuring cycles using 12 and 24 h UV-A radiation were studied. Nanoindentation was the chosen technique for characterizing the modulus of elasticity and hardness of samples. The curing degree and glass transition temperature of the epoxyacrylate matrix and the nanocomposites were determined by Differential Scanning Calorimetry (DSC). In addition, the Vickers microhardness and nanocomposite morphology were also investigated by Scanning Electronic Microscopy (SEM) and Transmission Electronic Microscopy (TEM). The results indicate an increase in the stiffness and hardness of the material, and a shift in the glass transition temperature. The increase in the elastic modulus is in concordance with the predictions made by two simple models: rule of mixture and Halpin-Tsai equation. A fair agreement between nanoindentation and microhardness measurements is also found. Finally, the importance of curing degree in some of the properties investigated in this study is also discussed.

  9. The use of epoxidised palm oil products (EPOP) for the synthesis of radiation curable resins 1. Synthesis of epoxidised RBD palm olein acrylate

    The synthesis of acrylated olein utilizing epoxidised refined, bleached and deodorized (RBD) palm olein has been carried out by acrylation reaction. This is done by the introduction of acrylic acid into oxirane group of the epoxidised RBD palm olein. The reaction was confirmed by analytical data i.e. oxirane oxygen content, iodine value and acid value and IR spectrophotometric method. It was found that, oxirane group in triglyceride molecule of epoxidised RBD palm olein (EPOL) is attacked by acrylic acid to yield epoxidised RBD palm olein acrylate (EPOLA). The EPOLA was found curable when subjected to ultraviolet radiation

  10. Peel bond strength of resilient liner modified by the addition of antimicrobial agents to denture base acrylic resin

    Cristiane S. Alcântara

    2012-12-01

    Full Text Available In order to prolong the clinical longevity of resilient denture relining materials and reduce plaque accumulation, incorporation of antimicrobial agents into these materials has been proposed. However, this addition may affect their properties. OBJECTIVE: This study evaluated the effect of the addition of antimicrobial agents into one soft liner (Soft Confort, Dencril on its peel bond strength to one denture base (QC 20, Dentsply. MATERIAL AND METHODS: Acrylic specimens (n=9 were made (75x10x3 mm and stored in distilled water at 37ºC for 48 h. The drug powder concentrations (nystatin 500,000U - G2; nystatin 1,000,000U - G3; miconazole 125 mg - G4; miconazole 250 mg - G5; ketoconazole 100 mg - G6; ketoconazole 200 mg - G7; chlorhexidine diacetate 5% - G8; and 10% chlorhexidine diacetate - G9 were blended with the soft liner powder before the addition of the soft liner liquid. A group (G1 without any drug incorporation was used as control. Specimens (n=9 (75x10x6 mm were plasticized according to the manufacturers' instructions and stored in distilled water at 37ºC for 24 h. Relined specimens were then submitted to a 180-degree peel test at a crosshead speed of 10 mm/min. Data (MPa were analyzed by analysis of variance (α=0.05 and the failure modes were visually classified. RESULTS: No significant difference was found among experimental groups (p=0.148. Cohesive failure located within the resilient material was predominantly observed in all tested groups. CONCLUSIONS: Peel bond strength between the denture base and the modified soft liner was not affected by the addition of antimicrobial agents.

  11. The use of natural rubber-based material for the preparation of radiation-curable resin. I. The reaction of epoxidised natural rubbers of low molecular weight with acrylic acid

    A synthesis method for the preparation of a new radiation-curable resin based on natural rubber has been established. The method was based on the reaction between epoxidised natural rubbers (ENR) of low molecular weight, i.e. Mn 0f 5,800 to 82,000, with acrylic acid in the presence of a catalyst and an inhibitor. Two grades of ENR namely ENR-25 and ENR-50 corresponding to 25 and 50 mole % epoxidation levels, respectively were used. The acrylation was carried out at temperatures between 95-105 degree C and was monitored by the measurements of the acid value of the reaction mixture as the reaction proceeded. It was confirmed by IR spectroscopic technique that the reaction occurred through the ring opening of the epoxide group of ENR. As a result, the new resin contains radiation-curable acrylate groups as well as hydroxyl groups on its main chain. When formulated with benzophenone, it solidified upon with UV light

  12. Study on Synthesis of Glyphosate-Acrylate Resin and Its Inhibition Toxicity on Microbes%草甘膦丙烯酸树脂的合成及其对微生物的抑制毒性研究

    江学志; 黄从树; 黄志雄; 任润桃; 王晶晶

    2012-01-01

    采用丙烯酰氯对草甘膦进行化学改性,使其接枝活性双键,合成丙烯酰草甘膦,并用FT-IR、1H-NMR和13C-NMR等分析手段表征丙烯酰草甘膦的化学结构.丙烯酰草甘膦用乙二醇酯化后与其他丙烯酸酯类单体共聚,制备草甘膦丙烯酸树脂.微生物抑制毒性试验表明草甘膦丙烯酸树脂薄膜的水解产物对藤壶金星幼体具有良好的杀生作用,为将该树脂应用于新型环境友好型防污涂料奠定了基础.%Glyphosate was chemically modified with acryloyl chloride, which was then grafted with double bonds to prepare N - acryloyl - glyphosate. The structure of N - acryloyl - glyphosate was characterized by FT - IR, 1H - NMR and 13C - NMR. The N - acrylogl - glyphosate was esterified with glycol and then co-polymerized with other acrylic monomers to prepare glyphosate - acrylate resin. The result of inhibition toxic-ity test for barnacle venus larvae microbial showed that the insecticide effect of glyphosate - acrylate resin was excellent, which would be used in environment friendly antifouling paint.

  13. Comparative evaluation of effect of metal primer and sandblasting on the shear bond strength between heat cured acrylic denture base resin and cobalt-chromium alloy: An in vitrostudy

    Sandeep Kalra; Vishwas Kharsan; Nidhi Mangtani Kalra

    2015-01-01

    Aims: The aim of this study was to evaluate the effect of metal primers and sandblasting on the shear bond strength (SBS) of heat cured acrylic denture base resin to cobalt-chromium (Co-Cr) alloy. Materials and Methods: A total number of 40 disk shaped wax patterns (10 mm in diameter and 2 mm in thickness) were cast in Co-Cr alloy. Samples were divided into 4 groups depending on the surface treatment received. Group 1: No surface treatment was done and acts as control group. Group 2: Only san...

  14. Properties of Acrylic Acid Resin Coating Materials Modified by Carbon Nanotubes%碳纳米管改性丙烯酸树脂涂饰材料的性能研究

    孙友昌; 马建中; 鲍艳; 刘海腾; 于玉龙

    2011-01-01

    Firstly, carbon nanotubes were modified and purified by the mix acids, then surface properties of carbon nanotubes were analyzed with the help of the infrared detector. Vinyl leather finishing agent was modified by carbon nanotubes using physical blending and in - situ emulsion polymerization. Tensile strength, elongation at break and water resistance of acrylic resin mem- brane nano- composite coating agent were determined. The results show that carbon nanotubes has the obvious enhancement toughening effect to acrylic resin membrane. Acrylic resin modified by carbon nanotubes has better tensile strength and elongation at break with an increase in the amount of carbon nanotubes, but has worse water resistance. Acrylic resin membrane modified by carbon nanotubes using physical blending and in - situ emulsion polymerization, the comprehensive performance is the best when the dosage of CNTs respectively is 0.04% and 0. 03%. Ultrasonic treatment will decrease the tensile strength and elongation at break, but the water resistance of the film will be increased slightly.%采用混酸对碳纳米管(CNTs)进行改性和纯化,并以此为原料,分别采用物理共混与原位乳液聚合法制备碳纳米管改性丙烯酸树脂皮革涂饰剂,将制备的丙烯酸树脂乳液分别成膜,并对所成薄膜的抗张强度、断裂伸长率、耐水性等进行测定。结果表明:碳纳米管对丙烯酸树脂薄膜有明显的增强增韧效果,随着碳纳米管用量的增加,薄膜的抗张强度、断裂伸长率增加,但耐水性略有下降。采用物理共混法与原位乳液聚合法改性丙烯酸树脂乳液,当CNTs的用量分别为0.04%和0.03%时,改性丙烯酸树脂薄膜的综合性能最好。对改性后的乳液进行超声处理,可使

  15. Warna Plat Resin Akrilik Setelah Direndam Dengan Ekstrak Bunga Rosella (Hibiscus Sabdariffa Linn) Sebagai Pembersih Gigi Tiruan Acrylic Resin Plate Color After Soaking With Extract Rosella Flower (Hibiscus Sabdariffa Linn) For Denture Cleanser

    Thalib, Bahruddin

    2013-01-01

    Background: Rosella is known as an healthy drink and have variety of properties. One of the content contained in rosella flower is anthocyanin. Anthocyanin is a pigmen that causes purplish red color on rosella flower. One of rosella drink???s enjoyer is people who wear acrylic denture. Acrylic has porosity and ability to absorb liquid dye that can causes discoloration. Dye contained in rosella flower may be cause discoloration of the acrylic denture base. Purpose: To find out the effect of im...

  16. Characterization of electron beam cured epoxy acrylate

    Epoxy resin has wide application in various industrial fields because of their good mechanical strength, superiority adhesion and low shrinkage etc. And the typical curing method for epoxy resins is thermal and press compaction. However, a curing method was used electron beam process in this study. Epoxy acrylate was fabricated from mixture of epoxy, acrylic acid, tetraphenylporphyrin (TPP) and hydroquinone monomethyl ether (MEHQ) with mole ratios. Then electron beam irradiation effect on the curing of the epoxy acrylate resin was investigated various absorption dose in nitrogen atmospheres at room temperature. The dynamic mechanical and thermal properties of the irradiated epoxy acrylate resins were characterized using dynamic mechanical analysis (DMA) and thermogravimetric analyzer (TGA). And the tensile and flexural strength were measured by an universal tensile machine (UTM)

  17. 室温自交联丙烯酸树脂乳液的制备与应用%Preparation and Application of A Room Temperature Self-crosslinking Acrylic Resin Emulsion

    董博震; 周炳才; 孙大庆

    2014-01-01

    采用半连续种子乳液聚合方法制备了室温自交联丙烯酸树脂乳液。探讨了使用不同阴离子表面活性剂和不同引发聚合体系以及后交联剂对乳液聚合稳定性和成品革性能的影响。%A room temperature self-crosslinking acrylic resin emulsion was synthesized by semi-continuous seed emulsion polymerization method. The effects using different anionic surfactants, different initiate polymerization systems and post-crosslinking agents on emulsion stability and performance of finished leather were discussed.

  18. Comparative evaluation of effect of metal primer and sandblasting on the shear bond strength between heat cured acrylic denture base resin and cobalt-chromium alloy: An in vitrostudy

    Sandeep Kalra

    2015-01-01

    Full Text Available Aims: The aim of this study was to evaluate the effect of metal primers and sandblasting on the shear bond strength (SBS of heat cured acrylic denture base resin to cobalt-chromium (Co-Cr alloy. Materials and Methods: A total number of 40 disk shaped wax patterns (10 mm in diameter and 2 mm in thickness were cast in Co-Cr alloy. Samples were divided into 4 groups depending on the surface treatment received. Group 1: No surface treatment was done and acts as control group. Group 2: Only sandblasting was done. Group 3: Only metal primer was applied. Group 4: Both metal primer and sandblasting were done. After surface treatment samples had been tested in Universal Testing Machine at crosshead speed of 0.5 mm/min in shear mode and scanning, electron microscope evaluation was done to observe the mode of failure. Statistical Analysis: All the observations obtained were analyzed statistically using software SPSS version 17; one-way analysis of variance (ANOVA and post-hoc Tukey test were applied. Results: The one-way ANOVA indicated that SBS values varied according to type of surface treatment done. The SBS was highest (18.70 ± 1.2 MPa when both sandblasting and metal primer was done when compared with no surface treatment (2.59 ± 0.32 MPa. Conclusions: It could be concluded that the use of metal primers along with sandblasting significantly improves the bonding of heat cured acrylic denture base resin with the Co-Cr alloy.

  19. 乳液聚合制备硅丙树脂/MgAl LDH纳米复合乳液及性能%Properties of Organosilicon Modified Acrylic Resin/MgAl Layered Double Hydroxide'Nanocomposites Prepared by Emulsion Polymerization

    赵维; 齐暑华

    2009-01-01

    A novel organosilicon modified acrylic resin/MgAl layered double hydroxide(LDH)nanocomposites was synthesized by emulsion polymerization reaction,consisting of organo modified nano-MgAl LDH,acrylate and organosilicon with vinyl group,and characterized by X-ray diffraction(XRD),transmission electron microscopy(TEM),physics and flameretardancy capabilities testing.It has been found that the MgAl LDH particles of 70nm disperse in the polymer matrix homogeneously.The physics capabilities testing data show that organosilicon modified acrylic resin/MgAl LDH nanocomposites have significantly enhanced mechanical properties.The oxygen index(LOI)of organosilicon modified acrylic resin/MgAl LDH nanocomposites is 7.5 higher than that of pure acrylic resin,having excellent flame-retardancy capability.%采用乳液聚合法,以丙烯酸酯类单体和不饱和硅油大单体为聚合单体,并加入有机改性后的纳米双羟基复合金属氧化物制备出硅丙树脂/LDH纳米复合乳液,对其成膜进行X射线衍射、透射电镜、力学性能、阻燃性能分析.结果表明:该材料为纳米复合材料,MgAl-LDH粒径为70nm,均匀地分散在聚合物中,其力学性能明显提高,抗氧指数比普通树脂高出7.5个单位,具有优异的阻燃性.

  20. Analysis and Testing of Bisphenol A—Free Bio-Based Tannin Epoxy-Acrylic Adhesives

    Shayesteh Jahanshahi

    2016-04-01

    Full Text Available A tannin-based epoxy acrylate resin was prepared from glycidyl ether tannin (GET and acrylic acid. The influence of the reaction condition for producing tannin epoxy acrylate was studied by FT-MIR, 13C-NMR, MALDI-TOF spectroscopy and shear strength. The best reaction conditions for producing tannin epoxy acrylate resin without bisphenol A was by reaction between GET and acrylic acid in the presence of a catalyst and hydroquinone at 95 °C for 12 h. FT-MIR, 13C-NMR and MALDI-TOF analysis have confirmed that the resin has been prepared under these conditions. The joints bonded with this resin were tested for block shear strength. The results obtained indicated that the best strength performance was obtained by the bioepoxy-acrylate adhesive resin prepared at 95 °C for a 12-h reaction.

  1. The Effect of Artificial Aging on The Bond Strength of Heat-activated Acrylic Resin to Surface-treated Nickel-chromium-beryllium Alloy

    Al Jabbari, Youssef S.; Zinelis, Spiros; Al Taweel, Sara M.; Nagy, William W.

    2016-01-01

    Purpose The debonding load of heat-activated polymethylmethacrylate (PMMA) denture base resin material to a nickel-chromium-beryllium (Ni-Cr-Be) alloy conditioned by three different surface treatments and utilizing two different commercial bonding systems was investigated. Materials and Methods Denture resin (Lucitone-199) was bonded to Ni-Cr-Be alloy specimens treated with Metal Primer II, the Rocatec system with opaquer and the Rocatec system without opaquer. Denture base resin specimens bonded to non-treated sandblasted Ni-Cr-Be alloy were used as controls. Twenty samples for each treatment condition (80 specimens) were tested. The 80 specimens were divided into two categories, thermocycled and non-thermocycled, containing four groups of ten specimens each. The non-thermocycled specimens were tested after 48 hours’ storage in room temperature water. The thermocycled specimens were tested after 2,000 cycles in 4°C and 55°C water baths. The debonding load was calculated in Newtons (N), and collected data were subjected by non parametric test Kruskal-Wallis One Way Analysis of Variance on Ranks and Dunn’s post hoc test at the α = 0.05. Results The Metal Primer II and Rocatec system without opaquer groups produced significantly higher bond strengths (119.9 and 67.6 N), respectively, than did the sandblasted and Rocatec system with opaquer groups, where the bond strengths were 2.6 N and 0 N, respectively. The Metal Primer II was significantly different from all other groups (P<0.05). The bond strengths of all groups were significantly decreased (P<0.05) after thermocycling. Conclusions Although thermocycling had a detrimental effect on the debonding load of all surface treatments tested, the Metal Primer II system provided higher values among all bonding systems tested, before and after thermocycling. PMID:27335613

  2. Analysis and Testing of Bisphenol A—Free Bio-Based Tannin Epoxy-Acrylic Adhesives

    Shayesteh Jahanshahi; Antonio Pizzi; Ali Abdulkhani; Alireza Shakeri

    2016-01-01

    A tannin-based epoxy acrylate resin was prepared from glycidyl ether tannin (GET) and acrylic acid. The influence of the reaction condition for producing tannin epoxy acrylate was studied by FT-MIR, 13C-NMR, MALDI-TOF spectroscopy and shear strength. The best reaction conditions for producing tannin epoxy acrylate resin without bisphenol A was by reaction between GET and acrylic acid in the presence of a catalyst and hydroquinone at 95 °C for 12 h. FT-MIR, 13C-NMR and MALDI-TOF analysis have...

  3. Influence of Sea Water Aging on the Mechanical Behaviour of Acrylic Matrix Composites

    Davies, P.; Le Gac, P.-Y.; Le Gall, M.

    2016-07-01

    A new matrix resin was recently introduced for composite materials, based on acrylic resin chemistry allowing standard room temperature infusion techniques to be used to produce recyclable thermoplastic composites. This is a significant advance, particularly for more environmentally-friendly production of large marine structures such as boats. However, for such applications it is essential to demonstrate that composites produced with these resins resist sea water exposure in service. This paper presents results from a wet aging study of unreinforced acrylic and glass and carbon fibre reinforced acrylic composites. It is shown that the acrylic matrix resin is very stable in seawater, showing lower property losses after seawater aging than those of a commonly-used epoxy matrix resin. Carbon fibre reinforced acrylic also shows good property retention after aging, while reductions in glass fibre reinforced composite strengths suggest that specific glass fibre sizing may be required for optimum durability.

  4. Cycloaliphatic epoxide resins for cationic UV - cure

    This paper introduces the cyclo - aliphatic epoxide resins used for the various applications of radiation curing and their comparison with acrylate chemistry. Radiation curable coatings and inks are pre - dominantly based on acrylate chemistry but over the last few years, cationic chemistry has emerged successfully with the unique properties inherent with cyclo - aliphatic epoxide ring structures. Wide variety of cationic resins and diluents, the formulation techniques to achieve the desired properties greatly contributes to the advancement of UV - curing technology

  5. Adherence of Candida albicans to denture base acrylics and silicone-based resilient liner materials with different surface finishes

    Nevzatoglu, Erdem U.; Ozcan, Mutlu; Kulak-Ozkan, Yasemin; Kadir, Tanju

    2007-01-01

    This study evaluated the surface roughness and Candida albicans adherence on denture base acrylic resins and silicone-based resilient liners with different surface finishes. Four commercial denture base acrylic resins ( three heat polymerized and one room temperature polymerized) and five silicone-b

  6. Polymerization time for a microwave-cured acrylic resin with multiple flasks Tempo de polimerização de resina acrílica em microondas, utilizando múltiplas muflas

    Daniela Maffei Botega

    2004-03-01

    Full Text Available This study aimed at establishing the polymerization time of a microwave-cured acrylic resin (AcronTM MC, simultaneously processing 2, 4, and 6 flasks. Required time was measured according to the parameters: monomer release in water, Knoop hardness, and porosity. Samples were made with AcronTM MC in different shapes: rectangular (32 x 10 x 2.5 mm for monomer release and porosity; and half-disc (30 mm in diameter x 4 mm in height for Knoop hardness. There were four experimental groups (n = 24 per group: G1 one flask (control; G2 two flasks; G3 four flasks, and G4 six flasks. At first, polymerization protocol was similar for all groups (3 min/450 W. Time was then adjusted for G2, G3, and G4, based on monomer release evaluation in the control group, obtained by spectrophotometer Beckman DU-70, with emitting wave of 206 nm. Knoop hardness test was performed using a Shimadzu HMV 2000 hardness tester, and 10 indentations were performed on each specimen's surface. Porosity was assessed after specimens were immersed in black ink and the pores counted in a microscope. Results showed that the complete polymerization of the resin occurred in 4.5 min for two flasks (G2; 8.5 min for four flasks (G3; and 13 min for six flasks (G4, all with 450 W. Statistical analysis revealed that the number of flasks does not interfere with polymerization, Knoop hardness, and porosity of the resin. Results showed that polymerization of microwave-curing resin with more than one flask is a viable procedure, as long as polymerization time is adjusted.O objetivo deste estudo foi o de determinar os tempos necessários para a polimerização padrão de uma resina acrílica em microondas, utilizando várias muflas simultaneamente. Os tempos necessários foram aferidos por parâmetros como monômeros liberados em água, dureza Knoop e porosidade. As amostras, confeccionadas em resina AcronTM MC, apresentavam as seguintes dimensões: para os parâmetros monômero residual e porosidade

  7. 原位法制备碳纳米管/纳米SiO2改性丙烯酸树脂乳液的研究%Acrylic Resin Emulsion Modified by MWCNTs/nano-SiO2 via In Situ Polymerization

    刘海腾; 马建中; 周建华; 孙友昌

    2012-01-01

    MWCNTs were firstly coated with inorganic silica by a sol - gel process and then grafted with silane coupling agent (KH570). The acrylic resin finishing agent was modified by carbon nanotube/nano-SiO2 via in -situ emulsion polymeriza-tion. The influence of the dosage of MWCNTs/nano - SiO2 on the emulsion and membrane performance were studied. The results show that the acrylic resin emulsion modified by carbon nanotubes/nano - SiO2 has a good stability. With an increase in the dosage of MWCNTs/SiO2 modified by KH570,the tensile strength of the film is increased by 34. 2% when the dosage of MWCNTs/SiO2 is 0. 04% compared with common acrylic resin. And the water resistance becomes better,the comprehensive performance is the best when the dosage of MWCNTs/Si02 is 0. 04%. Compared with common acrylic resin ,the thermo stability of acrylic resin modi-fied by MWCNTs/SiO2 is obviously improved.%采用溶胶-凝胶法制备了碳纳米管/纳米SiO2复合粒子,再用硅烷偶联剂KH570对其进行改性。采用原位乳液聚合技术,制备了碳纳米管/纳米SiO2改性的丙烯酸树脂乳液。研究了KH570改性MWCNTs/SiO2的用量对丙烯酸树脂乳液的稳定性、膜的力学性能及热性能的影响。结果表明:碳纳米管/纳米SiO2改性丙烯酸树脂乳液具有良好的稳定性;随着KH570改性MWCNTs/SiO2用量的增加,膜的抗张强度增大,与普通丙烯酸树脂相比,当其用量为0.04%时,抗张强度提高了34.2%,耐水性变好;当其用量为0.04%时,膜的综合性能最好。与普通丙烯酸树脂相比,碳纳米管/纳米SiO2改性丙烯酸树脂膜的耐热性明显提高。

  8. Electron beam curable branched chain polyurethane acrylates for magnetic media coatings

    Electron beam curable binder resins have been studied to realize the high quality magnetic coatings. It was supposed that resins with a higher crosslink density could lead to magnetic coatings with higher abrasion resistance. Branched chain polyurethane acrylates show a higher degree of cure by irradiation with an electron beam in comparison with linear polyurethane acrylates. This paper describes the potential wear resistance between properties of magnetic coatings and the physical properties of the cured unpigmented branched chain polyurethane acrylates that were used as the binder resins. (author)

  9. Synthesis and Antibacterial Activity of the Carboxymethyl Chitosan Graft Poly(Acrylic Acid)Superabsorbent Resins%羧甲基壳聚糖接枝聚丙烯酸高吸水树脂的制备及抑菌性能

    王开明; 黄惠莉; 王忠敏

    2012-01-01

    以壳聚糖为原料,在碱性条件下与氯乙酸反应,合成了具有良好水溶性的羧甲基壳聚糖.以合成的水溶性羧甲基壳聚糖和丙烯酸为原料,通过接枝共聚反应合成了具有一定抑菌性能的羧甲基壳聚糖接枝聚丙烯酸高吸水树脂.探讨了羧甲基壳聚糖的合成条件,研究了羧甲基壳聚糖用量对树脂吸水性能和抑菌性能的影响.结果表明,当碱与壳聚糖的质量比为6:1,氯乙酸与壳聚糖的质量比为5.5:1时,羧甲基壳聚糖的产率和取代度均较高,在水中的水溶性较好;在相同的合成条件下,当羧甲基壳聚糖用量为丙烯酸质量的1.80%时,树脂具有较高的吸水性能及良好的抑菌性能,且均优于壳聚糖接枝聚丙烯酸高吸水树脂,其吸水倍率为980 g/g,对大肠杆菌和金黄色葡萄球菌均有抑制其生长的作用,抑菌率分别为91.7%和70.6%.%The carboxymethyl chitosan which had good water-solubility was synthesized by the reaction between chitosan and chloroacetic acid under alkaline condition. After that, a series of carboxymethyl chitosan graft poly ( acrylic acid ) superabsorbent resins which had antibacterial activity were synthesized by graft polymerization between carboxymethyl chitosan and acrylic acid. The synthesis conditions of carboxymethyl chitosan were investigated, the effects of carboxymethyl chitosan content on the water absorbency and antibacterial activity of the superabsorbent resins were studied. The result showed that when the mass ratio of alkali to carboxymethyl chitosan was 6:1 and the mass ratio of chloroacetic acid to carboxymethyl chitosan was 5.5:1, the carboxymethyl chitosanthe had good yield and degree of substitution. Under the same conditions of synthesis, when the content of carboxymethyl chitosan was 1.8% of acrylic acid mass, the superabsorbent resin had better water absorbency and antibacterial activity, moreover, which were higher than chitosan graft poly ( acrylic acid

  10. Avaliação in vitro da efetividade de polimerização da resina acrílica dental ativada através de energia de microondas, quando em contato com metal Use of microwave energy for processing acrylic resin near metal

    Katia Olmedo BRAUN

    1998-04-01

    Full Text Available Com o objetivo de verificar a efetividade da energia de microondas na polimerização da resina acrílica próxima ao metal, foram confeccionados 36 corpos-de-prova cilíndricos com 30,0 mm de diâmetro x 4,0 mm de espessura, contendo no seu interior uma sela metálica com 28,0 mm x 8,0 mm x 0,5 mm, divididos aleatoriamente em 3 grupos e submetidos aos seguintes processamentos: G1 resina Clássico polimerizada em ciclo curto; G2 resina Acron-MC polimerizada em forno de microondas por 3 minutos a 500 W; G3 resina Clássico polimerizada em forno de microondas por 3 minutos a 500 W. Após a polimerização, cada amostra foi dividida em duas partes aproximadamente iguais, sendo que uma das partes foi utilizada para a avaliação de monômero residual, enquanto a outra foi submetida aos testes de dureza e porosidade. A dosagem de monômero liberada na água durante doze dias consecutivos foi avaliada através da espectrofotometria. A dureza Knoop foi verificada nas distâncias de 50, 100, 200, 400 e 800 mm da sela metálica, e a porosidade interna e externa foi avaliada a olho nu e com auxílio de microscópio com aumento de 100 X. Diante dos resultados obtidos, concluiu-se que a energia de microondas pode ser utilizada para a polimerização da resina acrílica contendo sela metálica no seu interior e que as resinas acrílicas convencionais, quando polimerizadas através da energia de microondas, apresentaram maior quantidade de poros.The conventional method to process acrylic resin is a time consuming step to construct removable prosthodontics. Microwave energy could provide a solution, but there are still questions regarding this process taking place in the presence of metal. The aim of this study was, therefore, to compare residual monomer, microhardness and porosity of two acrylic resins cured by different methods in the presence of a metal framework. The conditions evaluated were: Group 1 - Acrylic resin Clássico, short cycle heatcured for 3

  11. Development of radiation-curable resin based on natural rubber

    A new radiation curable resin based on natural rubber has been developed. The resin was based on the reaction between low molecular weight epoxidised natural rubber and acrylic acid. When formulated with reactive monomers and photoinitiator, it solidified upon irradiation with UV light. The resin may find applications in coating for cellulosic-based substrates and pressure-sensitive adhesive

  12. Synthesis of acrylic prepolymer

    An acrylic prepolymer was synthesized from glycidyl methacrylate (GMA), butyl methacrylate (BMA), methyl methacrylate (MMA) and acrylic acid (AA). Butyl acetate (BAc), benzoyl peroxide (BzO), 4-methoxyphenol (MPh) and triethylamine (TEA) were used as solvent, initiator, inhibitor and catalyst respectively. Observations of the synthesis leading to the formation of acrylic prepolymer are described. (author)

  13. Relative Molecular Mass Distribution of BG Resins

    1999-01-01

    Benzoguanamine-formaldehyde (BG-F) resins are a class of amino resins, which are important cross-linking agents for epoxy, alkyol and acrylic resins, etc. The cross-linking performance is the best one when the polymerization degree is 2-4. This paper discusses the effects of the pH value for polycondensation and the formaldehyde to benzoguanamine mole ratio in a methanol system, and compares the relative molecular mass distribution using the Flory statistics method.

  14. Avaliação do efeito de tratamentos superficiais sobre a força de adesão de braquetes em provisórios de resina acrílica Assessment of the effect of different surface treatments on the bond strength of brackets bonded to acrylic resin

    Deise Lima Cunha Masioli

    2011-02-01

    Full Text Available OBJETIVO: avaliar a influência do tratamento de superfície de resinas acrílicas na resistência ao cisalhamento de braquetes colados com resina composta. MÉTODOS: foram confeccionados 140 discos de resina acrílica autopolimerizável (Duralay®, divididos aleatoriamente em 14 grupos (n=10. Em cada grupo, os corpos de prova receberam um tipo diferente de tratamento de superfície: grupo 1 = sem tratamento de superfície (controle; grupo 2 = silano; grupo 3 = jato de óxido de alumínio (JOA; grupo 4 = JOA + silano; grupo 5 = broca diamantada; grupo 6 = broca diamantada+ silano; grupo 7 = ácido fluorídrico; grupo 8 = ácido fluorídrico + silano; grupo 9 = ácido fosfórico; grupo 10 = ácido fosfórico + silano; grupo 11 = monômero de metilmetacrilato (MMA; grupo 12 = MMA + silano; grupo 13 = Plastic conditioner (Reliance®; grupo 14 = Plastic conditioner (Reliance® + silano. Após o preparo de superfície, os corpos de prova foram analizados através da rugosimetria. Posteriormente, foram colados braquetes (Morelli® de incisivo central "standard edgewise" com resina fotopolimerizável Transbond XT®; de acordo com as instruções do fabricante. RESULTADOS: o agente umectante à base de silano não teve um efeito estatisticamente significativo sobre os valores de força de adesão; os tratamentos com JOA e broca produziram maiores mudanças topográficas na superfície da resina acrílica, bem como os maiores valores de rugosidade; observou-se uma correlação não linear entre a força de adesão e a rugosidade de superfície; tratamentos com monômero e JOA resultaram nas maiores forças de adesão. CONCLUSÕES: o silano não foi capaz de aumentar a força de adesão entre braquete e resina acrílica. Sugere-se mais estudos sobre este tema, pois a força de adesão obtida foi muito baixa.OBJECTIVE: To evaluate the influence of the surface treatment of acrylic resins on the shear bond strength of brackets bonded with composite resin

  15. The mechanism study on overcoming oxygen inhibition of polyether type multifunctional acrylate

    The high reactive polyester type multifunctional acrylic resin and polyether type multifunctional acrylate was prepared and used for EB cured coatings. The experimental results have showed that when the absorbed dose reaches 60 KGy, the hardness kept to 80%. In order to overcome oxygen inhibition the authors also performed further mechanism study of anti-oxidation

  16. KARAKTERISASI PELIKEL YANG TERADSORPSI PADA PERMUKAAN RESIN AKRILIK

    Siti Sunarintyas

    2015-08-01

    Full Text Available This research was aimed to determine the composiiton of adsorbed pellicle on acrylic resin surface. Fifteen plates of 10x10x2 mm were made from chemical, heat, and microwave activated acrylic resin. The plates were incubated in saliva for 1,2,3,4, and 5 hours. Pellicle characterization was done every hour by SDS PAGE electrophoresis. The result showed that: 1. chemical, heat, and microwave activated acrylic resin adsorbed salivary pellicle by molecular weight of 50-61 kDa (amylase band; 2. incubation of 1,2,3,4, and 5 hours in saliva resulted in similar pellicle composition. In conclusion, adsorbed salivary pellicle on acrylic resin surface during 5 hours showed similar characteristic in every hour, with the major protein adsorbed: amylase.

  17. Decarboxylation-based traceless linking with aroyl acrylic acids

    Nielsen, John

    1998-01-01

    beta-Keto carboxylic acids are known to decarboxylate readily. In our pursuit to synthesize beta-indolinyl propiophenones, we have exploited this chemistry as a mean of establishing a traceless handle. 2-Aroyl acrylic acids have been esterified to a trityl resin, after which Michael-type addition...

  18. Surface integrity of provisional resin materials

    Abouelatta, O. B.; El-Bediwi, A.; Sakrana, A.; Jiang, X. Q.; Blunt, L.

    2006-03-01

    Provisional resin materials are widely used in prosthetic dentistry and play an important role in the success of restorative treatment. Therefore, these materials must meet the requirements of preserving surface integrity during the treatment process. This study was done to evaluate surface roughness and microhardness of two provisional resin materials after 37 °C water storage. Two rectangular samples 21 mm × 11 mm × 3 mm, one bis-acrylic (bis-acrylic-Protemp II) and one polyethyl methacrylate (Trim®-PEMA) were fabricated as examples of provisional materials (n = 5 per material). The specimens were stored in 37 °C deionized distilled water for 24 h, 1, 2 and 3 weeks. The control specimens were not stored in water. The surface roughness of the tested materials (n = 10) was measured using a profilometer. Microhardness tests were conducted using a Vickers microscope mounted indenter system (n = 10). At 24 h, the surface roughness was recorded with bis-acrylic-Protemp II as higher than methacrylate materials. No significant differences of microhardness between Trim®-PEMA and bis-acrylic-Protemp II were recognized at 1, 2 and 3 weeks. The microhardness values increased with the increase of surface roughness and vice versa in both Trim®-PEMA and bis-acrylic-Protemp II. Both surface roughness and microhardness are affected by water storage. Bis-acrylic-Protemp II revealed better results in hardness than methacrylate resins, whereas Trim®-PEMA has a better surface roughness.

  19. Advances in acrylic-alkyd hybrid synthesis and characterization

    Dziczkowski, Jamie

    2008-10-01

    In situ graft acrylic-alkyd hybrid resins were formed by polymerizing acrylic and acrylic-mixed monomers in the presence of alkyds by introduction of a free radical initiator to promote graft formation. Two-dimensional NMR, specifically gradient heteronuclear multiple quantum coherence (gHMQC), was used to clarify specific graft sites of the hybrid materials. Both individual and mixed-monomer systems were produced to determine any individual monomer preferences and to model current acrylic-alkyd systems. Different classes of initiators were used to determine any initiator effects on graft location. The 2D-NMR results confirm grafting at doubly allylic hydrogens located on the fatty acid chains and the polyol segment of the alkyd backbone. The gHMQC spectra show no evidence of grafting across double bonds on either pendant fatty acid groups or THPA unsaturation sites for any of the monomer or mixed monomer systems. It was also determined that choice of initiator has no effect on graft location. In addition, a design of experiments using response surface methodology was utilized to obtain a better understanding of this commercially available class of materials and relate both the chemical and physical properties to one another. A Box-Behnkin design was used, varying the oil length of the alkyd phase, the degree of unsaturation in the polyester backbone, and acrylic to alkyd ratio. Acrylic-alkyd hybrid resins were reduced with an amine/water mixture. Hydrolytic stability was tested and viscoelastic properties were obtained to determine crosslink density. Cured films were prepared and basic coatings properties were evaluated. It was found that the oil length of the alkyd is the most dominant factor for final coatings properties of the resins. Acrylic to alkyd ratio mainly influences the resin properties such as acid number, average molecular weight, and hydrolytic stability. The degree of unsaturation in the alkyd backbone has minimal effects on resin and film

  20. Silicone/Acrylate Copolymers

    Dennis, W. E.

    1982-01-01

    Two-step process forms silicone/acrylate copolymers. Resulting acrylate functional fluid is reacted with other ingredients to produce copolymer. Films of polymer were formed by simply pouring or spraying mixture and allowing solvent to evaporate. Films showed good weatherability. Durable, clear polymer films protect photovoltaic cells.

  1. An investigation on the influence of tin foil substitute contamination on bond strength between resin denture teeth and the denture base: An in vitro study

    Sapna Bhaskaran; Hallikerimath, R B

    2012-01-01

    Statement of Problem: The problem of acrylic resin denture teeth separating from their denture base remains a major problem in prosthodontic practice and is frustrating to the patients as well as the dentists. Purpose: This study investigated the influence of tin foil substitute contamination on bond strength between acrylic resin denture teeth and their denture base. Materials and Methods: A total of 80 modified acrylic resin maxillary left central incisors were processed to their dent...

  2. α-氨基酮光引发剂促进环氧/丙烯酸酯混杂树脂光-热的双固化%Effect of α-Aminoketone Photoinitiator on UV-Heat Dual Curing of Epoxy/Acrylic Hybrid Resins

    李建雄; 柯涛; 马银涛; 刘安华

    2013-01-01

    将光引发剂2-二甲氨基-2-苄基-1-(4-吗啉苯基)-1-丁酮(PI-369)加入环氧树脂和环氧/丙烯酸酯混杂树脂,以紫外辐射和热激化树脂固化,以差示扫描量热(DSC)分析样品的起始放热温度,以红外光谱(FT-IR)分析环氧基团的变化,测量光、热固化样品的凝胶含量,比较PI-369光解前后对环氧树脂热固化的影响.引发剂PI-369经光照后可促进环氧与酸酐的反应,大幅降低环氧树脂固化的起始放热温度,显著促进光交联混杂树脂体系中环氧组分的热固化反应.混杂树脂经紫外辐射和80℃热固化12 h,凝胶含量可达95%以上.%Photoinitiator 2-benzyl-2-(dimethylamino)-1-[4-(4-morpholinyl) phenyl]-1-butanone (PI-369) was dissolved in epoxy resin and epoxy/acrylic hybrid resin, and the liquid resins were cured by UV radiation and heating. The contents of epoxy groups were identified by FT-IR and the incipient exothermal temperature of curing was measured by DSC. The effect of the photoinitiator before and after UV irradiation on the gel contents was investigated. After UV irradiation, PI-369 could promote the reaction of epoxy groups with methyl hexahydrophthalic anhydride (MHHPA) and the incipient exothermal temperature dropped greatly. For the UV cured hybrid resins, the activation temperature of the epoxy component for thermally curing was measured. The gel content of the hybrid resin was above 95% after UV irradiation and heating at 80 ℃ for 12h.

  3. UV-Curing of Nanoparticle Reinforced Acrylates

    Polymer reinforcement by silica and alumina nanoparticles evidently yields improved surface hardness. Single mixing of nanoparticles into an acrylate formulations, however, leads to highly viscous solutions inappropriate for coating procedures. The incompatibility of inorganic fillers and organic polymers can be avoided by surface modification providing an interface between the two dissimilar materials. For example, vinyltrimethoxysilane (VTMO) can react via hydrolysis/condensation reactions with hydroxyl groups present on the inorganic surface and should bond via the polymerisation-active vinyl group to an acrylate resin through crosslinking reactions. Grafting reactions of surface OH groups and different trialkoxysilanes were studied by thermogravimetry, infrared, and multinuclear NMR spectroscopy. The copolymeri-zation of modified nanoparticles with the acrylate matrix has been investigated by 13C NMR spectroscopy. UV curing under nitrogen inertization revealed a lower reactivity of vinyl groups of VTMO-modified silica compared to grafted methacryloxypropyl-trimethoxysilane (MEMO) which showed complete conversion of olefinic carbons (signals at 120 - 140 ppm). Under conditions of oxygen inhibition, the effect of the kind and the concentration of photoinitiator on the photopoly-merization reaction was studied. Compared to neat polyacrylate coatings the nanocomposite materials exhibit markedly improved properties, e.g., heat, scratch, and abrasion resistance. However, a much better abrasion resistance was obtained for coatings containing both silica nano-particles and corundum microparticles. In particular cases, radiation curing with 172 nm photons generated by Xe excimer was performed to obtain structured polymer surfaces, i.e., matting of the reinforced acrylate coatings

  4. Avaliação in vitro da influência do polimento superficial de resina acrílica para aparelhos ortodônticos na adesão e remoção de Streptococcus mutans In vitro evaluation of the influence of resin acrylic surface polishing for orthodontic appliances on adhesion and removal of Streptococcus mutans

    Selma Sano Suga

    2005-02-01

    Full Text Available No presente estudo, foi realizada análise microbiológica in vitro da superfície interna de placas para arcadas superiores, confeccionadas em resina acrílica utilizadas em aparelhos ortodônticos. Procurou-se avaliar se o fator polimento químico e polimento mecânico estavam associados à adesão microbiana de Streptococcus mutans.Também foi analisada a limpeza química e mecânica dos aparelhos. Na pesquisa, foram examinados 48 aparelhos, divididos em 3 grupos, sendo que cada grupo foi subdividido em 2 subgrupos, referente aos tipos distintos de polimento. O Grupo 1 serviu como controle; no Grupo 2 foi realizado a higienização mecânica das placas em resina acrílica, através da limpeza com escova para prótese total (Denture Brush, Kolynos e no Grupo 3 realizou-se a higienização dos aparelhos através de 30 minutos de imersão em solução de perborato de sódio (Limpador Efervescente de Próteses e Aparelhos Ortodônticos, Farmácia Fórmula & Ação. Pelos resultados estatísticos, através de análise descritiva, conclui-se que o tipo de polimento realizado na face interna da resina acrílica não influencia a adesão de Streptococcus mutans. A análise inferencial, realizada através de comparações entre os grupos avaliados, indica que houve redução na remoção do biofilme formado pela contaminação por Streptococcus mutans nos grupos, sendo que a utilização do limpador químico foi mais eficiente do que a limpeza mecânica através da escovação. Não houve, entretanto, diferenças entre os subgrupos, o que confirma que o tipo de polimento (químico e mecânico não interfere na adesão e remoção de Streptococcus mutans.The aim of this in vitro microbiologic analysis was to evaluate the adhesion of microorganisms on the internal surface of intra oral removable plates made in acrylic resin for orthodontic and prosthetic appliances. The hypothesis to be tested was that there is an association between chemical or

  5. Preparation and properties of UV curable acrylic PSA by vinyl bonded graphene oxide

    Pang, Beili; Ryu, Chong-Min; Jin, Xin; Kim, Hyung-Il

    2013-11-01

    Acrylic pressure sensitive adhesives (PSAs) with higher thermal stability for thin wafer handling were successfully prepared by forming composite with the graphene oxide (GO) nanoparticles modified to have vinyl groups via subsequent reaction with isophorone diisocyanate and 2-hydroxyethyl methacrylate. The acrylic copolymer was synthesized as a base resin for PSAs by solution radical polymerization of ethyl acrylate, 2-ethylhexyl acrylate, and acrylic acid followed by further modification with GMA to have the vinyl groups available for UV curing. The peel strength of PSA decreased with the increase of gel content which was dependent on both modified GO content and UV dose. Thermal stability of UV-cured PSA was improved noticeably with increasing the modified GO content mainly due to the strong and extensive interfacial bonding formed between the acrylic copolymer matrix and GO fillers

  6. Influence of a cobalt-chromium metal framework on surface roughness and Knoop hardness of visible light-polymerized acrylic resins Influência de estrutura metálica de cobalto-cromo na rugosidade e dureza Knoop superficiais de resinas acrílicas polimerizadas por luz visível

    Joane Augusto de Souza Júnior

    2006-06-01

    Full Text Available Although visible light-polymerized acrylic resins have been used in removable partial dentures, it is not clear whether the presence of a metal framework could interfere with their polymerization, by possibly reflecting the light and affecting important properties, such as roughness and hardness, which would consequently increase biofilm accumulation. The aim of this study was to compare the roughness and Knoop hardness of a visible light-polymerized acrylic resin and to compare these values to those of water-bath- and microwave-polymerized resins, in the presence of a metal framework. Thirty-six specimens measuring 30.0 x 4.0 ± 0.5 mm of a microwave- (Onda Cryl, a visible light- (Triad and a water-bath-polymerized (Clássico (control acrylic resins containing a cobalt-chromium metal bar were prepared. After processing, specimens were ground with 360 to 1000-grit abrasive papers in a polishing machine, followed by polishing with cloths and 1-µm diamond particle suspension. Roughness was evaluated using a profilometer (Surfcorder SE 1700 and Knoop hardness (Kg/mm² was assayed using a microhardness tester (Shimadzu HMV 2000 at distances of 50, 100, 200, 400 and 800 µm from the metal bar. Roughness and Knoop hardness means were submitted to two-way ANOVA and compared by Tukey and Kruskal Wallis tests at a 5% significance level Statistically significant differences were found (p0.05. Within the limitations of this in vitro study, it was concluded that the presence of metal did not influence roughness and hardness values of any of the tested acrylic resins.Resinas acrílicas polimerizadas por luz visível têm sido indicadas para a confecção de próteses parciais removíveis. Entretanto, não há estudos determinando se a presença de estrutura metálica interfere ou não na polimerização, considerando que essa estrutura pode refletir a luz e afetar propriedades como rugosidade e dureza e, consequentemente, facilitar o acúmulo de biofilme

  7. Application of reactive acrylate microgels in water-base coatings

    SA Sheng-shu; ZHANG Bao-hua; YANG Qing; WANG Xia-qin; MAO Zhi-ping

    2009-01-01

    Reactive acrylate microgels with different reactive groups such as carboxyl, hydroxide groups had excellent prop-erties such as quick-dry, low viscosity, high adhesion and hardness, which made them extensively used in preparing paints or in coating-modification. Reactive acrylate microgels were prepared by emulsion co-polymerization with zwitterions surfactant, anionic surfactant and nonionic surfactant as co-emulsifier. The water-base baking paints made from reactive acrylate micro-gels and melamine-formaldehyde resin had excellent combination properties. The aluminium powder can be well-dispersed in the paints. The influences of monomer components on the properties of the water-base baking paints were discussed in this paper. And the baking paints were also compared with the marketing solvent acrylate baking paints. It was found that the water-base acrylate amino baking paints had better combination properties than the organic solvent acrylate baking paints, which means that the water-base baking paints had a bright marketing future.

  8. In Vitro Color Change of Three Dental Veneering Resins in Tea, Coffee and Tamarind Extracts

    S. Muttagi

    2011-09-01

    Full Text Available Objective: To study the in vitro color changes of three dental resin veneering materials when immersed in tea, coffee and tamarind extracts.Materials and Methods: The color changes of heat polymerized tooth colored acrylic resin (Stellondetrey, B, F14, DPI Dental products of India Ltd, Mumbai, auto polymerized tooth colored acrylic resin (DPI, B, QV5, DPI Dental products of India Ltd, Mumbai andlight polymerized resin composite (Herculite XRV, Enamel A2, part no. 22860, lot no. 910437, Kerr Corporation, West Collins Avenue, Orange, CA, USA when immersed in water extracts of tea (Tata Tea Ltd. Bangalore, India, coffee (Tata Coffee Ltd. Coorg, Indiaand tamarind were evaluated using computer vision systems. The color images were recorded in R (red, G (green and B (blue form and converted into H (hue, S (saturationand V (value.Results: Significant color change occurred for auto polymerized tooth colored acrylic resin in tamarind extract, for heat polymerized tooth colored acrylic resin in tea extract andfor light polymerized resin composite in coffee extract. Auto polymerized tooth colored acrylic resin samples showed an overall higher color change. However, for all the material samples coffee extract produced more color change.Conclusion: These results suggest that the color stability of the resins is influenced by the presence of secondary metabolites such as tartaric acid, tannins, caffeine, saponins and phenols in tamarind, tea and coffee extracts.

  9. Acrylic vessel cleaning tests

    The acrylic vessel as constructed is dirty. The dirt includes blue tape, Al tape, grease pencil, gemak, the glue or residue form these tapes, finger prints and dust of an unknown composition but probably mostly acrylic dust. This dirt has to be removed and once removed, the vessel has to be kept clean or at least to be easily cleanable at some future stage when access becomes much more difficult. The authors report on the results of a series of tests designed: (a) to prepare typical dirty samples of acrylic; (b) to remove dirt stuck to the acrylic surface; and (c) to measure the optical quality and Th concentration after cleaning. Specifications of the vessel call for very low levels of Th which could come from tape residues, the grease pencil, or other sources of dirt. This report does not address the concerns of how to keep the vessel clean after an initial cleaning and during the removal of the scaffolding. Alconox is recommended as the cleaner of choice. This acrylic vessel will be used in the Sudbury Neutrino Observatory

  10. Acrylic purification and coatings

    ,

    2012-01-01

    Radon (Rn) and its decay daughters are a well-known source of background in direct WIMP detection experiments, as either a Rn decay daughter or an alpha particle emitted from a thin inner surface layer of a detector could produce a WIMP-like signal. Different surface treatment and cleaning techniques have been employed in the past to remove this type of contamination. A new method of dealing with the problem has been proposed and used for a prototype acrylic DEAP-1 detector. Inner surfaces of the detector were coated with a layer of ultra pure acrylic, meant to shield the active volume from alphas and recoiling nuclei. An acrylic purification technique and two coating techniques are described: a solvent-borne (tested on DEAP-1) and solvent-less (being developed for the full scale DEAP-3600 detector).

  11. Effect of post-polymerization heat treatments on the cytotoxicity of two denture base acrylic resins Efeito de tratamentos térmicos após a polimerização sobre a citotoxicidade de duas resinas acrílicas para base de próteses

    Janaina Habib Jorge

    2006-06-01

    Full Text Available INTRODUCTION: Most denture base acrylic resins have polymethylmethacrylate in their composition. Several authors have discussed the polymerization process involved in converting monomer into polymer because adequate polymerization is a crucial factor in optimizing the physical properties and biocompatibility of denture base acrylic resins. To ensure the safety of these materials, in vitro cytotoxicity assays have been developed as preliminary screening tests to evaluate material biocompatibility. ³H-thymidine incorporation test, which measures the number of cells synthesizing DNA, is one of the biological assays suggested for cytotoxicity testing. AIM: The purpose of this study was to investigate, using ³H-thymidine incorporation test, the effect of microwave and water-bath post-polymerization heat treatments on the cytotoxicity of two denture base acrylic resins. MATERIALS AND METHODS: Nine disc-shaped specimens (10 x 1 mm of each denture base resin (Lucitone 550 and QC 20 were prepared according to the manufacturers' recommendations and stored in distilled water at 37ºC for 48 h. The specimens were assigned to 3 groups: 1 post-polymerization in a microwave oven for 3 min at 500 W; 2 post-polymerization in water-bath at 55º C for 60 min; and 3 without post-polymerization. For preparation of eluates, 3 discs were placed into a sterile glass vial with 9 mL of Eagle's medium and incubated at 37ºC for 24 h. The cytotoxic effect of the eluates was evaluated by ³H-thymidine incorporation. RESULTS: The results showed that the components leached from the resins were cytotoxic to L929 cells, except for the specimens heat treated in water bath (pINTRODUÇÃO: A maioria das resinas acrílicas utilizadas para confecção de bases de próteses é composta pelo polimetacilato de metila. Muitos autores têm discutido o processo de polimerização dessas resinas em relação à conversão do monômero em polímero devido a sua importância na melhora da

  12. Synthesis and characterization of acrylated epoxidized soybean oil for UV cured coatings

    Habib, Firdous; Bajpai, Madhu

    2011-01-01

    This paper investigates the curing of biodegradable polymer films which were synthesized from soybean oil through the ultraviolet radiation and their stability against thermal degradation. In this study the epoxidation of soybean oil has been carried out via peracetic method. Further, an epoxy acrylate resin was synthesized from the epoxidized soybean oil (ESO) by using acrylic acid monomer. Triethylamine (TEA) and hydroquinone were used as a catalyst and inhibitor respectively. The acrylatio...

  13. Synthesis and Characterization of Core-Shell Acrylate Based Latex and Study of Its Reactive Blends

    Ying Nie; Min-Feng Tang; Xiao-Dong Fan; Xiang Liu

    2008-01-01

    Techniques in resin blending are simple and efficient method for improving the properties of polymers, and have been used widely in polymer modification field. However, polymer latex blends such as the combination of latexes, especially the latexes with water-soluble polymers, were rarely reported. Here, we report a core-shell composite latex synthesized using methyl methacrylate (MMA), butyl acrylate (BA), 2-ethylhexyl acrylate (EHA) and glycidyl methacrylate (GMA) as monomers and ammonium p...

  14. METHACRYLATE AND ACRYLATE ALLERGY IN DENTAL STUDENTS.

    Maya Lyapina

    2013-09-01

    Full Text Available A multitude of acrylic monomers is used in dentistry, and when dental personnel, patients or students of dental medicine become sensitized, it is of great importance to identify the dental ;acrylic preparations to which the sensitized individual can be exposed. Numerous studies confirm high incidence of sensitization to (meth acrylates in dentatal professionals, as well as in patients undergoing dental treatment and exposed to resin-based materials. Quite a few studies are available aiming to evaluate the incidence of sensitization in students of dental medicineThe purpose of the study is to evaluate the incidence of contact sensitization to some (meth acrylates in students of dental medicine at the time of their education, in dental professionals (dentists, nurses and attendants and in patients, the manifestation of co-reactivity.A total of 139 participants were included in the study, divided into four groups: occupationally exposed to (methacrylates and acrylic monomers dental professionals, 3-4 year-of-education students of dental medicine, 6th year–of-education students of dental medicine and patients with suspected or established sensitization to acrylates, without occupational exposure. All of them were patch-tested with methyl methacrylate (MMA, triethyleneglycol dimethacrylate (TREGDMA, ethyleneglycol dimethacrylate (EGDMA, 2,2-bis[4-(2-hydroxy-3-methacryloxypropoxy phenyl]propane (bis-GMA, 2-hydroxyethyl methacrylate (2-HEMA, and tetrahidrofurfuril metacrylate. The overall sensitization rates to methacrylates in the studied population are comparative high – from 25.9% for MMA to 31.7% for TREGDMA. Significantly higher incidence of sensitization in the group of 3-4 course students compared to the one in the group of dental professionals for MMA and TREGDMA was observed. Highest was the incidence of sensitization to ethyleneglycol dimethacrylate, BIS-GMA, 2-HEMA and tetrahydrofurfuryl methacrylate in the group of patients, with

  15. ANÁLISE CLÍNICA E HISTOLÓGICA DA UTILIZAÇÃO DA RESINA ACRÍLICA AUTOPOLIMERIZÁVEL NAS FRATURAS DE MANDÍBULA E MAXILA E SEPARAÇÃO DA SÍNFISE MENTONIANA EM CÃES E GATOS CLINICAL AND HISTOLOGICAL EVALUATION OF ACRYLIC RESIN IN THE FRACTURE OF THE MANDIBLE AND MAXILLA AND SEPARATION OF MANDIBULAR SYMPHISIS IN DOGS AND CATS

    Marco Antonio Gioso

    2001-04-01

    Full Text Available O trabalho foi desenvolvido em duas fases. A primeira constou de aplicação de resina acrílica autopolimerizável sobre dentes de cães experimentais, sem condicionamento ácido do esmalte dental; a gengiva foi analisada histologicamente nos períodos de um, três, sete, 14, 21 e 30 dias. A segunda fase foi conduzida em 20 cães e 10 gatos com fraturas do sistema estomatognático, atendidos no Ambulatório Central da FMVZ/USP. Nessa segunda fase, clínica, foi aplicado condicionamento ácido do esmalte. A resina era usada nas fraturas rostrais às raízes distais do primeiro molar inferior e do quarto pré-molar superior, bem como na separação da sínfise mentoniana. Os resultados da primeira fase mostraram que mesmo sem o condicionamento ácido houve aderência da resina acrílica sobre os dentes, embora houvesse necessidade de maior volume do material, o que provocou ulcerações dos tecidos moles da boca. Essa fase também evidenciou, à sondagem, que o epitélio de aderência sulcular permaneceu aderido, além de gengivite, ulceração da gengiva, língua e mucosa alveolar. A análise histológica revelou predominantemente ulceração dos tecidos em contato com a resina. Na segunda fase, todos os animais evidenciaram consolidação óssea das fraturas, além de gengivite e ulceração. Lesões periodontais foram encontradas em dois animais dos quais a resina foi removida tardiamente, com quatro e 12 meses após a aplicação, respectivamente. Em ambas as fases, os animais adaptaram-se bem à resina sobre os dentes.This paper was performed in two phases. In the first one, the stability of the acrylic resin over the teeth of dogs, without enamel acid conditioning, the clinical and histological reaction on the gingiva were analyzed in periods of 1, 3, 7, 14, 21 and 30 days. The second phase was conducted in 20 dogs and 10 cats, with acid etching technique. The resin was used in the rostral fractures to the distal roots of the lower first

  16. Hyperbranched urethane-acrylates

    Tasić Srba

    2004-01-01

    Full Text Available The synthesis, characterization and UV-curing of hyperbranched urethaneacrylates (HB-UA were investigated in this study. They were evaluated as oli-gomers in model UV curable coatings. HB-UAs were synthesized by reaction of an aliphatic hyperbranched polyester of the second generation (HBRG2 and an isocyanate adduct, obtained by the reaction of isophoronediisocyana-te and different hydroxy alkyl acrylates. Their thermal properties and viscosities depend on the degree of modification of HBRG2 and the type of hydroxy alkyl acrylate used. The introduction of a flexible alkoxylated spacer between the HBP core and acrylate end groups reduces steric hindrance by moving the cross linkable acrylate groups away from the HBP core and increase its reactivity. Due to the presence of abstractable H-atoms in the α-position to the ether links, HB-UAs based on poly(ethylene oxide monoacrylate are very reactive and do not show oxygen inhibition. The obtained coatings combine a high cross linking density with flexible segments between the cross links, which results in a good compromise between hardness and flexibility and have the potential to be used in different UV-curing applications.

  17. Synthesis and properties of photo-curable silicone (meth)acrylate oligomers

    Photo-curable resins are widely used in various applications such as coatings, adhesives and inks, due to their high efficiencies, environmental friendly technology and saving of energy. Silicone (meth) acrylate oligomers offer an excellent slip property because of their low surface tension. In addition, they can enhance other properties like chemical resistance and heat resistance. In this research, photo-curable silicone (meth) acrylate oligomers are prepared from modified PDMS (polydimethyl siloxane) polyols, diisocyanate, carboxylic acid and hydroxyl (meth) acrylate to evaluate basic property of these oligomers. (Author)

  18. The influence of various surface treatment methods on the surface properties and bonding strength of acrylic resin%不同表面处理方式对丙烯酸树脂表面性状和粘接强度的影响

    张丁华; 阮丹平; 吴春云

    2015-01-01

    目的:探讨不同表面处理方式对丙烯酸树脂表面性状和粘接强度的影响。方法制备硅橡胶与丙烯酸树脂构成的重叠联合模型。根据树脂条的不同表面处理方式,将模型随机分为4组:对照组、MMA浸润组、喷砂组、MMA浸润+喷砂组。用扫描电镜观察各组树脂处理后的表面形态变化,用粗糙度仪检测其粗糙度,万能材料试验机测定树脂条和硅橡胶之间的粘接强度。结果1.电镜观察显示,未经处理的树脂条表面打磨痕迹明显,经过MMA浸润后,表面出现溶解的痕迹,经过喷砂后,表面粗糙凸凹不平;2.粗糙度:喷砂组(3.12±0.02)μm和MMA浸润+喷砂组(3.11±0.01)μm>对照组(0.73±0.01)μm和MMA浸润组(0.71±0.01)μm,且差异有统计学意义(P 喷砂组(2.02±0.01)MPa >MMA浸润组(1.81±0.02)MPa >对照组(1.50±0.01) MPa,且差异有统计学意义(P the control group(0.73±0.01), MMA infiltration group(0.71±0.01). The difference was statistically significant (P sandblasting group(2.02±0.01) >MMA infiltration group(1.81±0.02) > control group(1.50±0.01). The difference was statistically significant (P< 0.05).ConclusionMMA monomer infiltration made the sand surface of acrylic resin produced different surface morphology, and thus improved the bonding between silicone rubber and acrylic resin, indicating it can be used widely in clinical.

  19. Commercial Ion Exchange Resin Vitrification in Borosilicate Glass

    Bench-scale studies were performed to determine the feasibility of vitrification treatment of six resins representative of those used in the commercial nuclear industry. Each resin was successfully immobilized using the same proprietary borosilicate glass formulation. Waste loadings varied from 38 to 70 g of resin/100 g of glass produced depending on the particular resin, with volume reductions of 28 percent to 68 percent. The bench-scale results were used to perform a melter demonstration with one of the resins at the Clemson Environmental Technologies Laboratory (CETL). The resin used was a weakly acidic meth acrylic cation exchange resin. The vitrification process utilized represented a approximately 64 percent volume reduction. Glass characterization, radionuclide retention, offgas analyses, and system compatibility results will be discussed in this paper

  20. Synthesis of Radiation Curable Palm Oil–Based Epoxy Acrylate: NMR and FTIR Spectroscopic Investigations

    Ashraf M. Salih

    2015-08-01

    Full Text Available Over the past few decades, there has been an increasing demand for bio-based polymers and resins in industrial applications, due to their potential lower cost and environmental impact compared with petroleum-based counterparts. The present research concerns the synthesis of epoxidized palm oil acrylate (EPOLA from an epoxidized palm oil product (EPOP as environmentally friendly material. EPOP was acrylated by acrylic acid via a ring opening reaction. The kinetics of the acrylation reaction were monitored throughout the reaction course and the acid value of the reaction mixture reached 10 mg KOH/g after 16 h, indicating the consumption of the acrylic acid. The obtained epoxy acrylate was investigated intensively by means of FTIR and NMR spectroscopy, and the results revealed that the ring opening reaction was completed successfully with an acrylation yield about 82%. The UV free radical polymerization of EPOLA was carried out using two types of photoinitiators. The radiation curing behavior was determined by following the conversion of the acrylate groups. The cross-linking density and the hardness of the cured EPOLA films were measured to evaluate the effect of the photoinitiator on the solid film characteristics, besides, the thermal and mechanical properties were also evaluated.

  1. Chemical resistance of optical plastics and resin for level detectors

    Omegna, Cicero L.; Fontes Garcia, Jonas; Ramos-Gonzáles, Roddy E.; Barbosa, Luiz C.

    2015-09-01

    A test method was developed to find the ideal optical material that supports the chemical reaction of some fuels. Optical plastics and resin were submerged for long periods of time in reservoirs of ethanol, gasoline, Diesel and biodiesel. The dimensional change and weight change of the submerged samples was measured. A special resin successfully supported the chemical attack of fuels. Samples of acrylic polymer and polycarbonate were used as type of optical plastic.

  2. A novel epoxy methacrylate resin containing phthalazinone moiety for UV coatings

    Yan Kou; Jin Yan Wang; Xi Gao Jian

    2007-01-01

    A novel phthalazinone modified epoxy acrylate resin for the high temperature resistant ultravioet (UV) curable coating was synthesized. The methacrylated epoxy resins obtained were utilized to UV radiation curing by taking 2.5% (wt%) of photoinitiator in combination with 20% (wt%) of diluent, and generated the interpenetraring polymer networks. The cured film had good thermal and chemical stability.

  3. Technology and the use of acrylics for provisional dentine protection.

    Kapusevska, Biljana; Dereban, Nikola; Popovska, Mirjana; Nikolovska, Julijana; Radojkova Nikolovska, Vеrа; Zabokova Bilbilova, Efka; Mijoska, Aneta

    2013-01-01

    Acrylics are compounds polymerized from monomers of acrylic, metacrylic acid or acrylonitrates. The purpose of this paper is to present the technology and use of acrylics for provisional dentine protection in the practice of dental prosthodontics. For this reason, we followed 120 clinical cases from the everyday clinical practice, divided into 4 groups of 30 patients who needed prosthetic reconstruction. The first group included cases in which we applied celluloid crowns for dentine protection, for the second group we used acrylic teeth from a set of teeth for complete dentures; in the third and fourth groups the fabrication was done with the system of an impression matrix and the acrylic resin block technique respectively. In all the examined patients, the gingival index by Silness and Loe and the vitality of the dental pulp were verified clinically, after preparation and 8 days from the placement of the provisional crown. The value for dental sensitivity measured after preparation was 2.59, and 8 days after the placement of the provisional crown it bwas 3.1. From these results we can conclude that after the 8th day from the placement of the provisional crown, there was an adaptation period, characterized by a decrease in the painful sensations. The value of the Silness and Loe gingival index measured after the preparation was 1.34, and 8 days from the placement of the provisional crown was 0.94. The results inclined us to the fact that the provisional acrylic crowns facilitated the reparation of the periodontal tissue. PMID:24566021

  4. Application of highly carboxylate resins in aqueous emulsion for leather coating avoiding the use of isopropyl alcohol

    Ollé Otero, Lluís; Baquero Armans, Grau; Solé, Mercè; Cuadros Domènech, Rosa Maria; Bacardit Dalmases, Anna

    2016-01-01

    Today, the first stages of the finishing processes of buffed cattle hides or full loose grain – known as impregnation – are largely carried out with acrylic resins and penetrating agents (typically, a mixture of surfactants and solvents). This application aims to strengthen the partially buffed grain layer bound to the rest of the dermis. To that end, a composition of emulsified acrylic resins is used, as well as a penetrating agent – usually isopropyl alcohol – and water. The process exa...

  5. Sifat Fisis Dan Mekanis Basis Gigi Tiruan Resin Akrilik Polimerisasi Panas Setelah Perendaman Ekstrak Daun Salam (Syzygium Polyanthum Wight)

    Harahap, Fitri Yuniati

    2014-01-01

    Research on the physical and mechanical properties heat cured acrylic resin denture base material immersed bay leaf extract (Syzygium polyanthum wight) has been done. This research aimed to see the effect of immersing time heat cured acrylic resin denture base in the bay leaf extracts for physical and mechanical properties. Samples were immersed in a solution of bay leaf extract with 40% concentration and soaking time 5, 10, 15, 20 and 25 minutes. From the results tests of s...

  6. The Reinforcement Effect of Nano-Zirconia on the Transverse Strength of Repaired Acrylic Denture Base

    ArRejaie, Aws S.; Abdel-Halim, Mohamed Saber; Rahoma, Ahmed

    2016-01-01

    Objective. The aim of this study was to evaluate the effect of incorporation of glass fiber, zirconia, and nano-zirconia on the transverse strength of repaired denture base. Materials and Methods. Eighty specimens of heat polymerized acrylic resin were prepared and randomly divided into eight groups (n = 10): one intact group (control) and seven repaired groups. One group was repaired with autopolymerized resin while the other six groups were repaired using autopolymerized resin reinforced with 2 wt% or 5 wt% glass fiber, zirconia, or nano-zirconia particles. A three-point bending test was used to measure the transverse strength. The results were analyzed using SPSS and repeated measure ANOVA and post hoc least significance (LSD) test (P ≤ 0.05). Results. Among repaired groups it was found that autopolymerized resin reinforced with 2 or 5 wt% nano-zirconia showed the highest transverse strength (P ≤ 0.05). Repairs with autopolymerized acrylic resin reinforced with 5 wt% zirconia showed the lowest transverse strength value. There was no significant difference between the groups repaired with repair resin without reinforcement, 2 wt% zirconia, and glass fiber reinforced resin. Conclusion. Reinforcing of repair material with nano-zirconia may significantly improve the transverse strength of some fractured denture base polymers. PMID:27366150

  7. Development and Characterization of Novel Interpenetrating Network (IPN) Foams from Epoxy Ester and Aliphatic Epoxy Resin

    Patel, Kanuprasad; Desai, Dhirubhai; Bhuva, Santosh

    2009-01-01

    Diglycidyl ether of bisphenol-A (DGEBA) was reacted with acrylate monomer at variable molar ratios. The reaction between glycerine and epichlorohydrine form glycidyl ether of polyol aliphatic epoxy resin. The resultant resins were characterized duly. Both the resins were mixed at different ratios with constant high shear stirring. The obtained mixture and suitable additives were heated at 150oC for one and half hour. The so called Interpenetrating Network (IPN) transformed into foams. The per...

  8. CURE OF A MICROGEL-EPOXY RESIN TWO-PHASE POLYMER WITH ETHYLENE DIAMINE

    SONG Aiteng; HUANG Wei; YU Yunzhao

    1992-01-01

    The curing of a microgel-epoxy resin two phase polymer prepared by in situ copolymerization of unsaturated polyester with acrylic monomer was studied. The unsaturated unit reacted with N- H during the cure of the resin with ethylene diamine. The Michael type reaction was ten times more rapid than the addition of N -H to epoxide .This was accounted for the lower apparent activation energy of the curing of the two phase resin.

  9. Effect of accelerated aging on the microhardness and color stability of flexible resins for dentures

    Marcelo Coelho Goiato

    2010-03-01

    Full Text Available Acrylic resins have been widely used due to their acceptable esthetics and desirable characteristics such as easy handling, good thermal conductivity, low permeability to oral fluids and color stability. Flexible resins were introduced on the market as an alternative to the use of conventional acrylic resins in the construction of complete and partial removable dentures. Although these resins present advantages in terms of esthetics and comfort, studies assessing chromatic and microhardness alterations of these materials are still scarce in the related literature. The aim of this study was to evaluate the chromatic and microhardness alterations of two commercial brands of flexible resins in comparison to the conventional resin Triplex when submitted to accelerated aging. The resins were manipulated according to manufacturers' instructions and inserted into a silicone matrix to obtain 21 specimens divided into 3 groups: Triplex, Ppflex and Valplast. Triplex presented the highest microhardness value (p < 0.05 for all the aging periods, which was significantly different from that of the other resins, followed by the values of Valplast and Ppflex. Comparison between the flexible resins (Ppflex and Valplast revealed a statistically significant difference (p < 0.05 as regards color. The flexible resin Ppflex and the conventional resin Triplex presented no statistically significant difference (p < 0.05 as regards aging. The accelerated aging significantly increased the microhardness values of the resins, with the highest values being observed for Triplex. Valplast presented the greatest chromatic alteration after accelerated aging.

  10. Acrylic Acid and Esters Will Be Oversupply

    Zheng Chengwang

    2007-01-01

    @@ Drastic capacity growth The production capacity of acrylic acid in China has grown drastically in recent years. With the completion of the 80 thousand t/a acrylic acid and 130 thous and t/a acrylic ester project in Shenyang Paraffin Chemical Industrial Co., Ltd., (CCR2006,No. 31) the capacity of acrylic acid in China has reached 882 thousand t/a.

  11. Resin composites

    Benetti, Ana Raquel; Peutzfeldt, Anne; Lussi, Adrian;

    2014-01-01

    OBJECTIVE: To investigate how the modulus of elasticity of resin composites influences marginal quality in restorations submitted to thermocyclic and mechanical loading. METHODS: Charisma, Filtek Supreme XTE and Grandio were selected as they were found to possess different moduli of elasticity but...... of resin composite (p=0.81) on the quality of dentine margins was observed, before or after loading. Deterioration of all margins was evident after loading (p<0.0001). More paramarginal enamel fractures were observed after loading in teeth restored with Grandio when compared to Charisma (p=0.......008). CONCLUSIONS: The resin composite with the highest modulus of elasticity resulted in the highest number of gap-free enamel margins but with an increased incidence of paramarginal enamel fractures. CLINICAL SIGNIFICANCE: The results from this study suggest that the marginal quality of restorations can be...

  12. Cytocompatible antifungal acrylic resin containing silver nanoparticles for dentures

    Acosta-Torres LS; Mendieta I; Nuñez-Anita RE; Cajero-Juárez M; Castaño VM

    2012-01-01

    Laura Susana Acosta-Torres,1 Irasema Mendieta,2 Rosa Elvira Nuñez-Anita,3 Marcos Cajero-Juárez,3 Víctor M Castaño41National School of Higher Education, School of Dentistry - Leon Unit, National Autonomus University of Mexico (UNAM), Leon, Guanajuato, 2Neurobiology Institute, National Autonomus University of Mexico (UNAM), Juriquilla, Queretaro, 3Animal Biotechnology Laboratory, Faculty of Veterinary Medicine at San Nicolas de Hidalgo, Michoac&aa...

  13. Acrylic polymer nanocomposite resins for water borne coating applications

    Nobel, M.L.

    2007-01-01

    Due to environmental and safety regulations the use of volatile organic components (VOC's) containing lacquers for exterior automotive purposes is under growing pressure. As a consequence there is a demand for more environmentally friendly alternatives like water borne coatings, high solid coatings,

  14. Effect of light-curing, pressure, oxygen inhibition, and heat on shear bond strength between bis-acryl provisional restoration and bis-acryl repair materials

    Shim, Ji-Suk; Lee, Jeong-Yol; Choi, Yeon-Jo; Shin, Sang-Wan

    2015-01-01

    PURPOSE This study aimed to discover a way to increase the bond strength between bis-acryl resins, using a comparison of the shear bond strengths attained from bis-acryl resins treated with light curing, pressure, oxygen inhibition, and heat. MATERIALS AND METHODS Self-cured bis-acryl resin was used as both a base material and as a repair material. Seventy specimens were distributed into seven groups according to treatment methods: pressure - stored in a pressure cooker at 0.2 Mpa; oxygen inhibition- applied an oxygen inhibitor around the repaired material,; heat treatment - performed heat treatment in a dry oven at 60℃, 100℃, or 140℃. The shear bond strength was measured with a universal testing machine, and the shear bond strength (MPa) was calculated from the peak load of failure. A comparison of the bond strength between the repaired specimens was conducted using one-way ANOVA and Tukey multiple comparison tests (α=.05). RESULTS There were no statistically significant differences in the shear bond strength between the control group and the light curing, pressure, and oxygen inhibition groups. However, the heat treatment groups showed statistically higher bond strengths than the groups treated without heat, and the groups treated at a higher temperature resulted in higher bond strengths. Statistically significant differences were seen between groups after different degrees of heat treatment, except in groups heated at 100℃ and 140℃. CONCLUSION Strong bonding can be achieved between a bis-acryl base and bis-acryl repair material after heat treatment. PMID:25722837

  15. A new approach to cure and reinforce cold-cured acrylics

    So, YC; Tsoi, JKH; Matinlinna, JP

    2012-01-01

    Purpose: The low degree of polymerization of cold-cured acrylics has resulted in inferior mechanical properties and fracture vulnerability in orthodontics removable appliances. Methods: In this study, the effect of reinforcement by various concentrations of chopped E-glass fibers (0%, 1%, 2%, 3% and 5% by weight of resin powder) and post-curing microwave irradiation (800 W for 3 min) on the flexural strength of cold-cured acrylics was evaluated at various storage conditions (at room temperatu...

  16. The Modification of the Acrylate Emulsion for Water-Based Coatings

    Chen Wei-Feng; Fa-Ai Zhang

    2005-01-01

    @@ 1Introduction The developments of the environment friendly materials and technology are largely promoted recently.There also come some new kinds of coatings including water-based coating, powder coating, high-solid coating and UV-cured coating[1]. The emulsion polymerization is the main method for preparing the polymer for coatings. One of the most widely used polymers is acrylate resin which is not well in some properties, such as weather resistance, endurance and water resistance[2]. We hope to improve the various properties of the acrylic emulsion by adding silicone made from tetraethyl orthosilicate(TEOS), making it better applied in coating field.

  17. Stress and flow analyses of ultraviolet-curable resin during curing

    Umezaki, Eisaku; Okano, Akira; Koyama, Hiroto

    2014-06-01

    The stress and flow generated in ultraviolet (UV)-curable resin during curing in molds were measured to investigate their relationship. The specimens were molds consisting of glass plates and acrylic bars, and UV-curable liquid resin. The specimens were illuminated from above with UV rays. Photoelastic and visual images were separately obtained at a constant time interval using cameras during curing. To help obtain the visual images, acrylic powder was mixed with the liquid resin. The stress was obtained from the photoelastic images by a digital photoelastic technique with phase stepping, and the flow was obtained from the visual images by a particle-tracking velocimetry technique. Results indicate that the stress generated in the UV-curable resin during curing depends on the degree of contact between the mold and the cured area of the resin, and is hardly related to the flow.

  18. Shear bond strength of provisional restoration materials repaired with light-cured resins.

    Chen, Hsiu-Lin; Lai, Yu-lin; Chou, I-chiang; Hu, Chiung-Jen; Lee, Shyh-yuan

    2008-01-01

    This study evaluated the repair bond strengths of light-cured resins to provisional restoration materials with different chemical compositions and polymerization techniques. Fifty discs (10 mm in diameter and 1.5 mm thick) were fabricated for each provisional resin base material, including a self-cured methacrylate (Alike), self-cured bis-acrylate (Protemp 3 Garant), light-cured bis-acrylate (Revotek LC) and a heat-cured methacrylate (Namilon). All specimens were stored in distilled water at 37 degrees C for seven days before undergoing repair with one of four light-cured resins, including AddOn, Revotek LC, Dyractflow and Unifast LC and a self-cured resin (Alike), according to the manufacturers' instructions, for a total of 200 specimens. After 24 hours of storage in 37 degrees C water, the shear bond strengths were measured with a universal testing machine and fracture surfaces were examined under a stereomicroscope. Two-way ANOVA revealed that provisional resin-base material (p material (p materials repaired with bis-acryl resins, with their failure modes primarily being of the adhesive type. The highest bond strengths were recorded when the provisional resin-base materials and repairing resins had similar chemical components and the failure modes tended to be of the cohesive type. PMID:18833857

  19. PBA-b-PHFBMA嵌段共聚物的制备及在涂料中的应用%The Synthesis and Applications of Poly(Butyl Acrylate-b-Hexafluorobutyl Methacrylate)Block Copolymers

    王红丹; 邓健; 李坚

    2012-01-01

    Poly(butyl acrylate-b-hexafluorobutyl methacrylate) block copolymers were synthesized by atom transfer radical polymerization(ATRP) and characterized by nuclear magnetic resonance(1H-NMR) and gel permeation chromatography(GPC).The fluoro-containing acrylic coating resin was prepared by mixing the block copolymers with conventional acrylic resin.The results show that the surface and anti-aging properties of the acrylic resins are greatly improved by adding the fluoro-containing block copolymers.When the amount of fluoro-containing block copolymer is more than 10%,the surface contact angle of the acrylic resin increases from 73° for pure acrylic resin to larger than 90° for the acrylic resin containing block copolymers,and the gloss retention of the resin is improved from 80% for the acrylic resin to about 90% for the acrylic resin containing block copolymers after UV irradiation about 1700 h.And the other conventional performances of acrylic coating resin are remained unchanged.%利用原子转移自由基聚合(ATRP)法合成了丙烯酸丁酯-甲基丙烯酸六氟丁酯嵌段共聚物(PBA-b-PHFBMA),并以核磁共振谱和凝胶渗透色谱对共聚物进行了表征。将制备的含氟嵌段共聚物应用于丙烯酸酯涂料树脂,对其性能进行了研究。结果表明,在丙烯酸酯树脂中加入含氟嵌段共聚物后,树脂的表面性能及耐老化性能有了明显的提高。含氟嵌段共聚物的加入量在10%以上时,丙烯酸酯树脂的表面接触角可从73°提高到90°以上;经紫外光加速老化1700h后,树脂的保光率达90%以上。且含氟嵌段共聚物的加入并不影响丙烯酸酯树脂的其它漆膜性能。

  20. Biocompatibility of polymethylmethacrylate resins used in dentistry.

    Gautam, Rupali; Singh, Raghuwar D; Sharma, Vinod P; Siddhartha, Ramashanker; Chand, Pooran; Kumar, Rakesh

    2012-07-01

    Biocompatibility or tissue compatibility describes the ability of a material to perform with an appropriate host response when applied as intended. Poly-methylmethacrylate (PMMA) based resins are most widely used resins in dentistry, especially in fabrication of dentures and orthodontic appliances. They are considered cytotoxic on account of leaching of various potential toxic substances, most common being residual monomer. Various in vitro and in vivo experiments and cell based studies conducted on acrylic based resins or their leached components have shown them to have cytotoxic effects. They can cause mucosal irritation and tissue sensitization. These studies are not only important to evaluate the long term clinical effect of these materials, but also help in further development of alternate resins. This article reviews information from scientific full articles, reviews, or abstracts published in dental literature, associated with biocompatibility of PMMA resins and it is leached out components. Published materials were searched in dental literature using general and specialist databases, like the PubMED database. PMID:22454327

  1. 聚酯改性丙烯酸聚氨酯汽车面漆的研制%Preparation and Research of Polyester Modified Acrylic Polyurethane Automotive Finish

    周树军

    2012-01-01

    用聚酯改性丙烯酸树脂配制聚氨酯汽车面漆,保持了丙烯酸树脂耐光、耐候性佳,户外曝晒耐久性强的特性,同时增强了丙烯酸树脂的韧性,提高了汽车面漆的鲜映性和抗冲击性能。%Polyurethane automotive topcoat which using polyester modified acrylic resin as binder, it's maintains the characteristics of acrylic resin light-fastness, excellent weatherability and outdoor exposure durability, at the same time it enhancing the acrylic resin toughness and improved the bright and impact resistance of the automobile finish.

  2. Poly(lauryl acrylate) and poly(stearyl acrylate) grafted multiwalled carbon nanotubes for polypropylene composites

    Daugaard, Anders Egede; Jankova Atanasova, Katja; Hvilsted, Søren

    2014-01-01

    , polymerizations of lauryl or stearyl acrylate were performed, resulting in two novel polymer modifications on the MWCNT (poly(lauryl acrylate) or poly(stearyl acrylate)). The method was found to give time dependent loading of polymers as a function of time (up to 38 wt% for both acrylates), and showed a plateau...... were found to be substantially improved, where poly(lauryl acrylate) was found to be the superior surface modification, resulting in a conductive composite....

  3. New UV-curable acrylated polyester prepolymers from palm oil based products

    Acrylated polyester prepolymers (PEPP-1 and PEPP-2) were synthesized from palm oil and its products. UV-curing and characteristic properties of UV-cured films of synthesized polyester resins were studied. The characteristic properties studied include pendulum hardness, gel content, FT-IR analysis, tensile strength and elongation at break. The materials have good potential for the production of radiation curable coating applications

  4. Permittivity and Electromagnetic Interference Shielding Investigations of Activated Charcoal Loaded Acrylic Coating Compositions

    Sharief ud Din Khan; Manju Arora; Wahab, M. A.; Parveen Saini

    2014-01-01

    Acrylic resin (AR) based electromagnetic interference (EMI) shielding composites have been prepared by incorporation of up to 30 wt% activated charcoal (AC) in AR matrix. These composites have been characterized by XRD, Raman spectroscopy, scanning electron microscopy, dielectric, and EMI shielding measurement techniques. XRD patterns and Raman studies confirm the incorporation of AC particles inside AR matrix and suggest possible interactions between phases. The SEM images show that incorpo...

  5. Application of Kissinger analysis to glass transition and study of thermal degradation kinetics of phenolic–acrylic IPNs

    S Goswami; K Kiran

    2012-08-01

    Degradation kinetics of sequential IPNs, based on novolac resin and poly (2-ethyl hexyl acrylate), are studied at linear heating rates of 2°C/min, 5°C/min, 10°C/min and 20°C/min by thermogravimetric analyser (TGA). Activation energy (a) and order () of thermal decomposition reaction for IPNs and pure phenolic resin are evaluated from TGA curves using differential method of Freeman and Carroll. Decrease in Tg with an increase of acrylate content in IPNs are seen. Lower activation energy (a'), as calculated by applying Kissinger equation, for the concerned transition of IPNs, compared to that of pure phenolic resin is quite evident from DSC study.

  6. SYNTHESIS OF SOAP-FREE ACRYLIC HYDROSOLS

    Li Jia; Zong-hui Liu; De-qing Wei

    2002-01-01

    Poly(methyl methacrylate/ethyl acrylate/acrylic acid) hydrosols were prepared by employing soap-freepolymerization, and (acrylic acid/butyl acrylate) oligomer was used as the polymeric surfactant. The effect of reactioncondition on the morphology and particle size of the hydrosols was investigated. The minimum amount of acrylic acid in thehydrosols is 2%. The maximum weight average molecular weight (Mw) of polymer that assures soap-free emulsionconversion into hydrosol is about 1.2 × 105-1.3 × 105. The particle transforming process was investigated, and an obviouschange of particle diameter and morphology was observed.

  7. Immobilization of spent resin with epoxy resin

    immobilization of spent resin using epoxy resin has been conducted. The spent resin was mixtured with epoxy resin in variation of concentration, i.e., 30, 40, 50, 60, 70 weight percent of spent resin. The mixture were pour into the plastic tube, with a diameter of 40 mm and height of 40 mm. The density, compressive strength and leaching rate were respectively measured by quanta chrome, paul weber apparatus and gamma spectrometer. The results showed that the increasing of waste concentration would be decreased the compressive strength, and increased density by immobilized waste. The leaching rate of 137Cs from waste product was not detected in experiment (author)

  8. Resin bonding of metal brackets to glazed zirconia with a porcelain primer

    Lee, Jung-Hwan; Lee, Milim; Kim, Kyoung-Nam; Hwang, Chung-Ju

    2015-01-01

    Objective The aims of this study were to compare the shear bond strength between orthodontic metal brackets and glazed zirconia using different types of primer before applying resin cement and to determine which primer was more effective. Methods Zirconia blocks were milled and embedded in acrylic resin and randomly assigned to one of four groups: nonglazed zirconia with sandblasting and zirconia primer (NZ); glazed zirconia with sandblasting, etching, and zirconia primer (GZ); glazed zirconi...

  9. Resin Catalyst Hybrids

    S. Asaoka

    2005-01-01

    @@ 1Introduction: What are resin catalyst hybrids? There are typically two types of resin catalyst. One is acidic resin which representative is polystyrene sulfonic acid. The other is basic resin which is availed as metal complex support. The objective items of this study on resin catalyst are consisting of pellet hybrid, equilibrium hybrid and function hybrid of acid and base,as shown in Fig. 1[1-5].

  10. Radiation curing silicone acrylate systems

    Radiation curing silicone systems by either ultra violet light (UV) or electron beam (EB) is introduced. The cure is based on the polymerization of the acrylic C = C double bond via a radical chain reaction. In the EB curing process a sufficient number of radicals for spontaneous polymerization is produced due to the high radiation energy whereas with UV light the energy is not as intensive thus a photo-initiator is required for a UV process. The required high local radical concentration provided by its decay. The radical generation immediate chain-growing leads to rapid and efficient crosslinking even at room temperature. It is for this reason that silicone acrylates cure immediately. All coater capable of handling 100% thermally curing silicones are suitable for the use with Goldschmidt's RC systems