840S环氧树脂体系固化反应特性

用差示扫描量热法(DSC) 在动态条件下对840S 环氧树脂体系的固化反应动力学进行了研究。根据所测量的不同升温速率的DSC 曲线, 运用温度升温速率( T-β) 图外推法得到该环氧树脂体系的固化工艺参数, 即凝胶化温度、固化温度、后处理温度, 这些温度参数为制定合理的固化工艺提供了理论基础。采用Kissinger 方程和Crane 方程计算该840S 环氧树脂体系的动力学参数, 即表观活化能E_a 、表观频率因子A 和反应级数n 。根据所计算的动力学参数, 建立了该840S 环氧树脂体系的固化动力学模型。利用所建立的固化动力学模型分别预测了等温和动态条件下840S 环氧树脂体系的固化反应特性。 

Curing reaction characteristics of 840S epoxy resin

The kinetics of the cure reaction for a system of 840S epoxy resin was monitored by the differentail scanning calorimet ry (DSC) and investigated by the constant heating methods. According to the DSC graphs , the curingprocess temperatures such as gelation temperature ( Tgel ) , peak temperature ( Tp ) and t reat temperature ( Ttreat ) wereacquired using T βgraph ext rapolation , and these temperatures play an important role in confirming the technicalparameters of the molding process of the resin system. The kinetic parameters of the curing reaction of 840S epoxyresin such as the overall activation energy Ea , the f requency factor A and the value of reaction order n wereobtained , and the kinetic model of the curing process based on n order reaction equation was set up using Kissingerand Crane equation. The characteristics of the curing reaction under dynamic and isothermal conditions is great useful for determining reasonable curing process parameters of the 840S epoxy resin system.