环氧树脂改性研究进展

综述了近年来用弹性体、热塑性树脂以及液晶聚合物等对环氧树脂改性的研究新进展。讨论了改性环氧树脂相结构和性能。     

有机硅改性环氧树脂的研究进展

综述了有机硅改性环氧树脂的主要方法及增韧机理,并展望了有机硅改性环氧树脂的发展趋势。     

聚氨酯改性环氧树脂研究进展

环氧树脂是一种热固性树脂,在航天、复合材料等有着广泛应用。环氧树脂改性之后性能会有所改变。本文综述了常见的增韧方法,总结发现聚氨酯改性环氧树脂可以明显的提高环氧树脂的韧性和耐低温性能,有着较好的应用价值。     

环氧树脂改性聚氨酯乳液的研究进展

综述了环氧树脂相互改性聚氨酯乳液的研究进展。环氧树脂改性聚氨酯乳液的方法包括物理共混法和化学共聚,改性后乳液的固含量提高、涂膜的硬度和拉伸强度增加、耐水性耐化学品性增强。     

环氧树脂改性研究新进展

虽然环氧树脂因具有优异的粘接性能和力学性能等而被广泛应用,但其耐热性较差、脆性大等缺陷限制了其在高性能领域中的应用。为此综述了有机硅树脂、聚氨酯、聚酰亚胺、刚性无机填料、纳米粒子及腰果壳油改性环氧树脂的最新研究进展,对各种改性环氧树脂的优缺点和改性机理进行了探讨,并对其应用前景进行了展望。     

环氧树脂改性研究进展

综述了近年来国内外环氧树脂的改性机理和方法,包括结构改性、橡胶改性、树脂改性、有机硅改性、膨胀单体改性和无机填料改性等。     

环氧树脂增韧改性研究进展

回顾了环氧树脂韧改性的一些常用方法,详细介绍了以橡胶弹性体,热塑性树脂及则性粒子增韧环氧树脂的一些重要研究情况。并且对环氧树脂增韧性性的进行了比较系统的总结,例举了一些已被人们承认的增韧机理。 还介绍了环氧树脂改性的最新方法,液晶聚合物改性,大分子固化剂增韧的一些研究情况。     

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.     

环氧树脂增韧改性研究进展

综述了增韧改性环氧树脂的方法及进展并,指出了环氧树脂增韧改性的发展方向。     

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。     

电子封装材料用环氧树脂增韧研究进展

未改性环氧树脂固化物存在质脆、冲击性能差等缺点，限制了它在复杂环境下的应用。针对这些不足，国内外科研工作者对其进行了大量改性研究。文中综述了近年来相关研究领域的研究进展及发展趋势。     

亚麻油改性特-辛基酚醛树脂的合成及性能研究

利用亚麻油与松香对辛基酚醛树脂进行改性合成改性辛基酚醛树脂。对改性产品进行了GPC、FT-IR的表征分析及其软化点、脂肪烃溶解性和溶剂溶解性能等的研究。实验表明,亚麻油与松香质量比在20%~40%之间时,所得产品分子量(Mn)6 000~10 000,分子量分布范围(PD I)小于4,庚烷容纳度在10~20 mL/2 g,软化点大于110℃,是平版印刷油墨用的一种新型高分子聚合物。     

环氧树脂的弹性体增韧改性

综述了国内外有关环氧树脂的聚合物弹性体增韧改性的最新研究进展,并分析了其增韧机理     

Fluorescence labels to monitor water absorption in epoxy resins

Water uptake phenomena was studied in a group of commercial epoxy based thermosets using gravimetric and fluorimetric analysis. The different epoxy formulations were labeled with two dansyl derivatives differing in the spacer length between the chain and the fluorophore moiety. The fluorimetric method consisted of monitoring the changes in the first moment of the dansyl emission band as a function of water immersion time. Using the fluorescence, it was possible to obtain the parameters that govern the water diffusion process and there was a good concordance with gravimetric results. Furthermore, the fluorescence response of the dansyl moieties was used to study the effect of the molecular structure of the polymers in the water absorption process.     

混酚组成对腰果酚改性酚醛树脂性能的影响

合成了腰果酚改性酚醛树脂,对其进行了软化点及凝胶化时间的测定。并进一步用凝胶色谱分析了其分子量及分子量分布,探讨了它们之间的内在联系。     

Reinforcement of epoxy resins with multi-walled carbon nanotubes for enhancing cryogenic mechanical properties

Epoxy resins are widely applied in cryogenic engineering and their cryogenic mechanical properties as important parameters have to be improved to meet the high requirements by cryogenic engineering applications. Carbon nanotubes (CNTs) are regarded as exceptional reinforcements for polymers. However, poor carbon nanotube (CNT)–polymer interfacial bonding leads to the unexpected low reinforcing efficiency. This paper presents a study on the cryogenic mechanical properties of multi-walled carbon nanotube reinforced epoxy nanocomposites, which are prepared by adding multi-walled carbon nanotubes (MWCNTs) to diglycidyl ether of bisphenol-F epoxy via the ultrasonic technique. When the temperature decreases from room temperature to liquid nitrogen temperature (77 K), a strong CNT–epoxy interfacial bonding is observed due to the thermal contraction of epoxy matrix because of the big differences in thermal expansion coefficients of epoxy and MWCNTs, resulting in a higher reinforcing efficiency. Moreover, synthetic sequence leads to selective dispersion of MWCNTs in the brittle primary phase but not in the soft second phase in the two phase epoxy matrix. Consequently, the cryogenic tensile strength, Young's modulus, failure strain and impact strength at 77 K are all enhanced by the addition of MWCNTs at appropriate contents. The results suggest that CNTs are promising reinforcements for enhancing the cryogenic mechanical properties of epoxy resins that have potential applications in cryogenic engineering areas.     

环氧树脂胺类固化剂的改性

总结了环氧树脂改性胺固化剂种类 ,制法 ,性能与应用情况     

Morphology of rubber‐modified vinyl ester resins cured at different temperatures

The morphologies of styrene (St) crosslinked divinylester resins (DVER) modified with elastomers were analyzed. The primary focus of this study was on the effect of the molecular weight of the resins, the reactivity of the elastomeric modifiers, and the temperature of curing. All of these variables have a strong influence on both the miscibility and the viscosity of the system, affecting the phase‐separation process that takes place in the unreacted and the reacting mixture. The selected liquid rubbers were carboxyl‐terminated poly(butadiene‐co‐acrylonitrile) (CTBN), a common toughening agent for epoxy resins, and an almost unreactive rubber with the DVER; and St comonomers and vinyl‐terminated poly(butadiene‐co‐acrylonitrile (VTBN), a reactive rubber. Different morphologies potentially appear in these systems: structures formed by DVER–St nodules surrounded by elastomer and spanning the whole sample; dual cocontinuous micron‐size domains formed by elastomer‐rich or resin‐rich domains; and a continuous DVER–St‐rich phase with included complex nodular domains. These microstructures can be varied by just changing the nature and concentration of the elastomer, the molecular weight of the resin, or the curing temperature. The appearance of these morphologies is discussed as a function of the above variables. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 274–283, 2003     

核壳聚合物增韧环氧树脂的进展

核壳聚合物（CSP）现已用于增韧环境树脂，它具有许多优点：预先设计的CSP在环氧基体中的形态、大小和分散状态与固化规范无关；在提高环氧树脂韧性的同时不降低玻璃化温度。本文综述了CSP／环氧共混物的性能和增韧机理。主要的增韧机理是CSP粒子空穴化，释放裂缝附近的三轴度，继而产生膨胀形变和剪切屈服。