有机硅改性酚醛型环氧固化剂及其固化产物性能的研究

Study of Modified Epoxy Curing Reagent by Oganosilicon and the Properties of Curing Product

摘要:

通过聚甲基三乙氧基硅烷(PTS)与环氧丙氧丙基三甲氧基硅烷缩合产物对线性酚醛树脂进行接枝改性，验证了反应的发生，并将其改性产物用于固化环氧树脂。通过制备一系列不同比例改性酚醛树脂并分别与环氧树脂固化。所得的环氧固化产物进行冲击强度、玻璃化转变温度、热失重等测试，结果表明，改性固化产物比未改性固化产物玻璃化转变温度提高了约30℃，冲击强度最高提高了36.6%，高温热稳定性也显著增强。改性产物实现了热稳定性和韧性的综合提升。

Abstract:

Novolac resin was modified by grafting reaction with condensation product of Polymethyl Triethoxy Silane and Polymethyltriethoxysilane, which could be used for curing epoxy resin. The different modified novolac resins were prepared from different ratio of materials and cured with epoxy resins. The cured products were tested by impact strength, glass transition temperature and thermogravimetric analysis. The results showed that the glass transition temperatures of modified cured products was 30℃ higher than the pure product, the impact strength increased more than 36.6%, and the thermal stability better.