研究了EP/PI和BMVPES两种TS/TP共混体系的反应诱导相分离过程及形貌结构.采用相差显微镜原位研究了反应诱导相分离的过程,发现分相初期形成了均匀的相结构;随着相分离的发展,一定浓度区域样品中的双连续结构经过演化发展,分相后期样品内部与边缘的形貌不一致.通过对固化后样品断面的SEM观察,发现在TP浓度很低时形成海岛结构,当TP浓度稍高,样品形成了核壳结构,在样品边缘和与基板接触的上下等外侧形成了TS的富集区,只有极少量的TP分散颗粒存在;在样品的中间,TS和TP形成双连续结构,其中TP富集相具有细丝状的网络特征.分析认为,EP和BMI为热固性树脂,初始样品为小分子,在反应开始时表现为流体,为快组分;PI和PES为典型的热塑性聚合物,它们的黏弹性特征随着相分离的发展越来越显著,即Tg以下为玻璃态,Tg以上表现出弹性、黏弹性特征,为慢组分.在反应分相过程中,由于TP富集相缠结网络的松弛慢于相分离的速度,因此TP富集相网络的整体收缩不可避免,在TP与TS动力学极不对称的作用之下,初始均匀的双连续结构最终发展为核壳结构.
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