聚醚砜改性环氧树脂体系粘弹性相分离的研究

Studies on the Viscoelastic Phase Separation in Epoxy Resin Modified with Polyethersulfone

采用光学显微镜、光散射和扫描电镜等技术对聚醚砜(PES)/环氧树脂/二(2,6-二甲基苯胺基)甲烷体系的相分离过程进行了研究.实验结果表明在该体系的相分离的演化过程中存在着明显的慢动态相的粘弹性效应,同时对于PES含量较低的体系(PES-13.2wt%和15.9wt%),在120和140℃固化时均观察到二次相分离现象,而PES含量较高的体系(PES-18.5wt%),在同样温度下固化时仅观察到一次相分离过程.

The phase separation evolution of polyethersulfone/epoxy resin/4,4'-methylene-bis(2,6-dimethylaniline) blends was investigated by optical microscopy (OM), time resolved light scattering (TRLS) and scanning electron microscopy (SEM). The experimental results indicate that there exists viscoelastic effect on the phase separation evolution. The double phase separation was observed in the blend with lower content of PES (13.2 wt% and 15.9 wt%) cured at 120 and 140 degreesC. However, this phenomenon did not occur when the higher PES content blend (18.5 wt%) was cured at the same temperatures.