温度效应对氟链封端聚醚酰亚胺改性环氧树脂相分离的影响

用差示扫描量热仪(DSC)、扫描电镜(SEM)和时间分辨光散射(TRLS)比较了全氟碳链封端和苯环封端聚醚酰亚胺改性环氧树脂在不同温度下的相分离.结果表明,与P-blend相比,F-blend的固化速度和相分离速度较慢,诱导期和相结构固定时间推迟,相间距较小.升高温度,相间距因相分离速度加快而增大,同时由于全氟碳链端基引起的差异减小.因此,通过改变固化温度和聚醚酰亚胺的端基来降低聚醚酰亚胺的表面能,可以在一定程度上调控反应诱导相分离体系的相结构,并获得相间距较小的双连续结构.

Influence of Temperature Effect on Phase Separation of Epoxy Resin Modified with Polyetherimide

The phase separations of epoxys resin modified with phenyl terminated and fluorocarbon chain polyetherimide at different temperature has been studied by using DSC, SEM and time-resolved light scattering(TRLS). It was found that for F-blend, the phase separation occurred and curing rate and phase separation rate were slower than those for P-blend which leads to smaller periodic distance. As the temperature increased, the larger periodic distance resulting from the higher phase separation rate and the difference between the two systems caused by fluorocarbon terminated chain became smaller. It suggests that the phase structure can be controlled by lowering the surface energy of polyetherimide and it is a possible way to obtain co-continuous structure with a smaller periodic distance.