吸水过程对环氧树脂的动态松弛行为的影响

The Effect of Water Absorption on the Behavior of Dynamic Relaxation of the Epoxy Resins

以酚醛树脂和乙酸、正丁酸和苯乙酸酯化的酚醛树脂固化邻甲酚环氧树脂．应用称重法、示差扫描量热法（DSC）和动态机械分析法（DMA）等手段研究吸水过程对环氧树脂的动态松弛行为的影响．结果表明，吸水过程对酚醛树脂和酯化酚醛树脂固化体系的动态松驰行为有显著的影响，这是由于两种体系中侧基对吸水过程及与水分子的相互作用不同所致．

Abstract O-Cresol novolac epoxy resins (ECN) were cured with phenol novolac resin (NOV) and three esterified phenol novolac resins. Gravimetric method and DMA were used to study the effect of water absorption on the dynamic relaxation. Experimental results show that the relaxation behavior is greatly affected by the water absorption, which is affected by the polarity and the flexibility of the side groups.