通过对热处理前后电子束辐射固化环氧树脂的动态力学分析,研究了不同样品的凝胶含量、tanδ以及动态模量的变化规律.结果表明,对电子束辐射固化的环氧树脂进行热处理,可以提高样品的固化程度和玻璃化温度(Tg),热处理后样品的模量随着温度的升高而下降的幅度减少.随着辐射固化度的增加,热处理的影响减弱.当热处理温度超过辐射引发剂的热引发温度时,在样品的tanδ曲线上出现反应局部热交联网络的松弛峰.在辐射固化度相近的情况下,树脂体系中的引发剂含量和分子量对热处理的效果有重要影响.分子量分布多样性的环氧树脂体系在热处理后的固化程度、Tg以及高温模量都较高.对于同样的环氧树脂体系,经过足够剂量的电子束辐射或进行适宜的热处理,所得固化物的Tg和高温模量均优于热固化样品.
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