聚醚砜/环氧树脂共混体系流变特性与固化性能的研究

环氧树脂是一种性能优良的热固性树脂,但是存在抗冲击性能差的缺点。聚醚砜(PES)是一种高性能热塑性树脂,与环氧树脂共混能够改善环氧树脂的韧性。系统研究了不同PES含量的PES/环氧树脂共混体系的流变特性和固化性能。通过对等温粘度曲线的数据拟合分析,建立了粘度模型,分析了PES对PES/环氧树脂共混体系粘度的影响机理,并通过DSC测试研究了PES对共混体系固化性能的影响。结果表明,PES在环氧树脂中的溶解过程可以引起共混体系粘度的波动,PES的引入缩短了PES/环氧树脂共混体系的凝胶时间,而且PES中的羟基对环氧树脂的固化具有促进作用。

STUDY ON RHEOLOGICAL PROPERTIES AND CURING PERFORMANCE OF PES/EPOXY RESIN MIXTURE SYSTEM

Epoxy resin is a kind of thermosetting resin with good properties.However,it has the inherent weakness of poor shock resistance.Polyethersulfone (PES) is a kind of thermoplastic resin with good properties which can improve the toughness of epoxy resin by blending with epoxy resin.The rheological properties and curing performance of PES/epoxy resin mixture system with different PES content were studied systematically in this paper.A viscosity model was established according to the obtained rheological data of isothermal viscosity curves,and the mechanism of the effect of PES on the curing of PES/epoxy resin mixture system was analyzed.The influence of PES on the curing performance of PES/epoxy resin mixture system was also studied by DSC test.The results show that the dissolution of PES in epoxy resin could lead to the fluctuation of viscosity of the mixture system.The introduction of PES shortened the gel time of PES/epoxy resin mixture system,and the hydroxyl groups in PES promoted the curing of the epoxy resin.