PPGDGE对二次固化环氧树脂性能的影响

Impact of PPGDGE on properties of two-stage cured epoxy resins

采用高温潜伏性固化剂超细双氰胺对环氧树脂E51/改性胺固化剂593体系进行高温二次固化,并用聚丙二醇二缩水甘油醚(PPGDGE)对该体系进行改性。通过力学性能、动态力学分析、形状记忆性能和扫描电子显微镜研究了二次固化和PPGDGE用量对环氧树脂体系的影响。结果表明:二次固化使环氧树脂强度大幅提高,拉伸强度为79.1 MPa,提高了47.9%;PPGDGE的加入使环氧树脂的形状记忆性能大幅提高,当加入9 phr PPGDGE时,冲击强度提高了28.0%,形状回复速率提高了52.8%,形状回复率提高了5.2%。

The epoxy resin E51/modified amine curing agent593system was cured by high temperature two-stage curing agent superfine dicyandiamide and modified by polypropylene glycol diglycidyl ether(PPGDGE).The impact of two-stage curing and amount of PPGDGE on the system were observed by analysis on mechanical properties,dynamics,and shape memory as well as scanning electron microscope.The results show that the tensile strength of two-stage cured epoxy resin is enhanced significantly by47.9%and has reached79.1MPa.The shape memory of epoxy resin is greatly improved by adding PPGDGE.The impact strength,shape recovery velocity and shape recovery ration of the system when adding PPGDGE of9phr are increased by28.0%,52.8%and5.2%respectively.