环氧树脂低温增韧研究进展

总结了环氧树脂在低温环境下的增韧方法，即固化剂的选择、热塑性聚合物增韧改性环氧树脂、纳米材料增韧改性环氧树脂、超支化聚合物增韧改性环氧树脂和碳纤维增韧改性环氧树脂，对近几年国内外环氧树脂低温增韧研究成果和改性环氧树脂力学性能模拟分析进行综述。最后，对环氧树脂低温增韧研究的发展趋势作出了展望。     

环氧树脂增韧研究进展

增韧环氧树脂是环氧树脂领域的研究热点。概述了环氧树脂增韧的研究进展,详细介绍了近年来用热致液晶聚合物、互穿网络聚合物、纳米粒子增韧增强环氧树脂的研究现状,这些方法都明显地提高了环氧树脂的综合性能,并对它们的优缺点和增韧机理进行了阐述。     

环氧树脂增韧改性技术研究进展

综述了环氧树脂的增韧改性技术,总结了环氧树脂的复合增韧机理。介绍对比了多种增韧技术的增韧机理、研究发展现状及优缺点,其中包括橡胶增韧、热塑性树脂增韧、有机硅改性、核壳聚合物增韧、刚性粒子增韧、纳米粒子增韧、膨胀型单体增韧、大分子固化剂增韧、热致液晶聚合物增韧、互穿聚合物网络增韧、树枝型分子增韧等。     

环氧树脂增韧改性研究进展

综述了国内外环氧树脂增韧改性的研究进展。介绍了橡胶类弹性体、热塑性树脂、纳米粒子、液晶聚合物、超支化聚合物、互穿网络结构和柔性链段等增韧改性环氧树脂的研究现状,讨论了单一增韧方法对环氧树脂综合性能的影响及存在的缺陷,展望了未来多种增韧方法协同增韧改性环氧树脂的发展趋势。     

核壳聚合物增韧环氧树脂的研究及进展

核壳聚合物(CSP)用来增韧环氧树脂的最大优点,即在提高韧性的同时而不降低材料的Tg和加工性能。综述了核壳聚合物增韧环氧树脂的特点,核壳聚合物的制备方法、微观结构及形态,以及增韧环氧树脂及其复合材料的性能及影响因素。树枝形聚合物作为一种结构特殊的聚合物,也越来越得到广泛的研究和应用。并对环氧树脂的增韧机理进行了阐述,即空穴化-塑性形变。文中还对核壳聚合物及树枝形聚合物增韧环氧树脂进行了展望。     

环氧树脂增韧增强改性研究进展

综述了国内环氧树脂增韧增强改性的最新研究进展,详细介绍了纳米粒子、液体橡胶、热塑性树脂、原位聚合物、液晶聚合物、核壳聚合物、大分子固化剂和膨胀型单体增韧增强环氧树脂的一些重要研究现状。对它们的增韧增强环氧树脂的优缺点和机理进行了探讨。     

环氧树脂增韧研究进展

介绍了弹性体、刚性粒子、无机纳米粒子、柔性链段固化剂、核壳结构聚合物及热致性液晶聚合物增韧改性环氧树脂的研究进展,阐述了各增韧剂的增韧机理及其改性环氧树脂的优缺点,最后对环氧树脂增韧改性的研究进行展望。     

环氧树脂增韧技术的研究进展及展望

着重讲述了一些纳米材料增韧、超支化聚合物增韧、液晶高分子材料增韧以及柔性链段改性增韧等增韧方法。概述了最近几年国内外环氧树脂增韧技术最新的研究成果和进展状况,为进一步提高环氧树脂性能及应用范围,加深对环氧树脂增韧技术研究以及在增韧技术上的进一步突破创新,对一些环氧树脂增韧技术进行的程度予以说明并对环氧树脂增韧研究方向进行了展望。     

环氧树脂增韧改性新技术

概述近年来国内外对环氧树脂增韧改性的研究情况,着重介绍了利用互穿网络聚合物(IPN)、热致液晶聚合物(TLCP)及纳米粒子等增韧改性环氧树脂的最新方法和研究进展,并对IPN、TLCP及纳米粒子的增韧方法、增韧机理作了介绍和讨论。     

环氧树脂的改性研究进展

介绍了环氧树脂的特性和环氧树脂改性的主要趋势-提高环氧树脂的韧性,分别论述了橡胶类弹性体增韧环氧树脂、热塑性塑料增韧环氧树脂、热致液晶聚合物增韧环氧树脂、柔性链段固化剂增韧环氧树脂、无机纳米材料改性环氧树脂以及互穿网络(IPN)结构的环氧树脂体系等环氧树脂增韧改性的方法.同时,对聚氨酯的特性、用聚氨酯改性环氧树脂的六种方法以及互穿聚合物网络技术,进行了较为详细的介绍,并分析了改性环氧树脂目前存在的技术问题.     

Solvent‐free cyanoethylation of selected alcohols using amberlyst A‐21 polymer resin

Solvent‐free cyanoethylation of selected alcohols with acrylonitrile (AN) using a weakly basic polymer resin, Amberlyst A‐21 (AA‐21) was studied at 75°C. The conversion of primary alcohols, 1‐octadecanol, hexane‐1,6‐diol, pentaerythritol, but‐2‐yne‐1,4‐diol, N‐methyldiethanolamine, triethanolamine and diethanolamine is higher than secondary alcohols, isopropanol and glycerol in the presence of polymer resin. Of various alcohols, but‐2‐yne‐1,4‐diol gave the product in high conversion (87%) in cyanoethylation with a polymer resin/AN weight ratio of 0.04. The polymer resin showed recycling ability only in two cycles to produce cyanoethylated product from diethanolamine. In case of 1‐octadecanol, hexane‐1,6‐diol, and N‐methyldiethanolamine with AN under similar conditions, no recycling ability was observed. Thermally treated polymer resin at 75°C afforded the product in lower conversion (55%) whereas the same product was obtained in 69% when fresh polymer resin was used in cyanoethylation of 1‐octadecanol. No catalytic effect was observed for polymer resin treated at 100°C. Fourier transform infrared (FTIR) spectra showed CN stretching at 2248 cm^?1 for the polymer resin collected after the reaction which was caused by the AN binding on polymer resin during the reaction. As per thermogravimetric curves, 5% weight loss was observed at 201°C for recovered resin and at 161°C for polymer resin treated at 100°C. Scanning electron microscope images confirmed the AN binding on polymer beads after catalytic activity. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013     

丙烯酸预聚物的参数对改性醇酸树脂的影响

用丙烯酸预聚物改性得到的醇酸树脂具有干燥快,耐候性好等特点。建立了醇酸树脂配方设计的通用程序,该程序可用于丙烯酸预聚物改性醇酸树脂的设计。讨论了丙烯酸预聚物的分子量、官能度以及在配方中的双例等对树脂性能参数的影响;明确了丙烯酸预聚物的参数等对改性醇酸树脂的作用。     

聚丙烯基材表面树脂附着的研究进展

表面能低、惰性及低极性是聚丙烯难以被附着的重要原因。选择附着树脂对聚丙烯表面改性有助于涂料润湿和附着成膜。附着树脂主要包括聚烯烃类、有机硼引发类、端叠氮基芳香聚合物等。聚烯烃类附着树脂一种是聚丙烯的氯化物或马来酸酐接枝物,以及它们的再功能化扩链产品,另一种是其他聚烯烃的接枝物。有机硼和端叠氮基芳香聚合物是原位化学接枝的附着树脂新类型,拓展了聚烯烃类的适用温度和适用环境。     

Readily decomposed thermosetting resins for recovering and reusing resin‐embedded materials

To help recover the intrinsically valuable, reusable metal parts at the end of a product's life‐cycle, we have used thermosetting (epoxy) resin that contains a small amount of thermoplastic polymer, polyethersulfone, which can be readily chemically decomposed. In a morphologically homogeneous modified thermosetting resin, the resin portion does not readily decompose when treated with an organic solvent, and chemical resistance equals the unmodified epoxy resin. A resin portion with thermoplastic polymer having continuous‐phase morphology was finely broken down by treatment with an organic solvent, and the embedded metal parts were separated and recovered. Readily decomposed thermosetting resin can thus be obtained by controlling the morphology of the thermoplastic polymer in the thermosetting resin to form a continuous phase. We also obtained a material having continuous variation in the phase morphology of a cured resin, from that with homogeneous morphology to that with continuous‐phase morphology of the thermoplastic polymer: phase structure inclination material. We were thus able to control the decomposition rate by chemical treatment in one resin. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 1463–1470, 2006     

环氧树脂增韧方法的研究进展

概述了增韧环氧树脂的现状,详细介绍了各种增韧方法、机理以及研究进展,包括传统的橡胶增韧法,近几年常见的热塑性树脂、热致液晶聚合物、互穿网络聚合物、核壳聚合物、无机纳米粒子以及柔性链段固化剂增韧法,绿色环保生物质增韧法,其他新型增韧方法等,并对未来环氧树脂的增韧方法进行了展望.     

弱碱性阴离子交换树脂去除青霉素中的杂质

探索了用弱碱性阴离子交换树脂去除青霉素中的聚合物杂质。通过对树脂性能进行研究分析,将离子交换树脂应用于青霉素生产中,筛选出具有青霉素杂质去除能力的XX-16弱碱性阴离子树脂,通过树脂的选择性交换和吸附,将青霉素中的杂质进行有效吸附,有效降低了青霉素中的聚合物含量。     

A new strategy to improve alkyd/acrylic compatibilization in waterborne hybrid dispersions

Grafting of alkyd resin to the acrylic polymer is needed to fully exploit the possibilities of these hybrids; but in the current technology, grafting is accompanied by an important reduction of the unsaturated groups of the alkyds, which adversely affects the curing of the film and its properties. A novel strategy that overcomes these limitations is presented. The strategy is based on the use of alkyd resin functionalized with methacrylic groups, that substantially improved the incorporation of the resin to the growing acrylic polymer chain, and the polymer particle homogeneity, without decreasing the degree of unsaturation in the alkyd resin.     

Composite polymer particles with a gradated resin composition by suspension polymerization

We have conducted a study of composite polymer particles with a gradated resin composition by suspension polymerization, in which the resin composition gradually changes from the surface to the center of the particles. The binder resin of the polymer particles consists primarily of styrene, butyl acrylate, and methacrylic acid (MAA). Fourier transform infrared/photoacoustic spectroscopy analysis of the polymer particles by suspension polymerization has proved that MAA, having a higher polarity, concentrates near the surface of the particles, and this results in a formation similar to a core–shell structure. These composite polymer particles are excellent in blocking resistivity because the resin, containing a higher concentration of MAA, has a high glass‐transition temperature. Composite polymer particles with a gradated MAA concentration could be used for toner applications in low‐power hot‐roll fusing electrophotography systems because the melting property of the core resin is controlled and allows fusing at lower temperatures. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 97: 682–690, 2005     

环氧树脂增韧改性技术研究进展和新方法及其机理

简单介绍了环氧树脂技术的研究进展和近期的主要应用,并概述了环氧树脂的改性技术.主要介绍了增韧改性的一些新方法,包括热塑性树脂增韧、互穿网络增韧、热致性液晶增韧、原位聚合增韧、核壳结构聚合物增韧等,主要介绍了用橡胶弹性体、热塑性树脂、刚性粒子、核壳型结构聚合物来增韧环氧树脂,以及环氧树脂绝缘性、耐湿热性和阻燃性等的改进方法,并对其中的增韧机理作了总结分析.最后本文综述了环氧树脂增韧改性技术发展及其未来展望.     

环氧树脂改性研究进展

综述了改性环氧树脂的最新研究状况,概述了橡胶弹性体、热塑性树脂、互穿网络聚合物、刚性粒子及核壳结构聚合物对环氧树脂的增韧改性以及对环氧树脂阻燃性、绝缘性的改性,并对环氧树脂改性的新方法进行了展望。