【摘要】 用线性酚醛树脂(PN)和4-氨基苯基氨基砜(SAA)作为固化剂,与刚性棒状环氧树脂联苯环氧(DGEBP)、四甲基联苯环氧(DGETMBP)和传统双酚A环氧树脂(DGEBA)分别进行固化.研究了固化剂和环氧树脂化学结构的改变对热固网络相行为和热力学性能的影响.结果表明,刚性环氧网络比传统的DGEBA具有更好的热力学性能.DGEBP可形成不同类型的取向网络,而取向态的类型也直接影响了热固网络的热力学性能.用扫描电镜(SEM)观察不同网络体系的断裂面结构,发现取向的刚性棒状环氧网络的断裂面呈韧性断裂,而其它无定形环氧网络则呈典型的脆性断裂.更多还原

【Abstract】 Phenol novolac resins(PN) and sulphanilamide(SAA) were used to cure rigid rod epoxy resins,namely DGEBP,DGETMBP and traditional epoxy resin(DGEBA).The effects of chemical structure of epoxy resins on the thermal,mechanical,and phase behavior were studied.The results show that rigid rod epoxy resins exhibited better physical properties than DGEBA.The epoxy networks which contain oriented domains showed high thermal properties and toughness.SEM was conducted to investigate the morphology of fracture surface.The fractography of unisotropic rigid rod epoxy networks exhibited an extremely rough and highly deformed fracture surface.The fracture surfaces of the isotropic epoxy networks were smooth,which was the character of fragile materials.更多还原