【摘要】 研究了无规羧基丁腈橡胶/双酚A型环氧树脂/2-乙基-4-甲基咪唑体系的反应机理、结构形态、断口形貌以及热-力学性能。 试验结果表明,在环氧树脂中加入少量橡胶即可提高其韧性,而热-力学性能无明显下降;在橡胶/环氧树脂/2、4-咪唑体系中存在三个基本的反应;经橡胶韧化的环氧树脂是两相体系,并且两相界面结合力强;橡胶颗粒可以成为裂纹分伎的核心,从而消耗导致裂纹扩展的能量,提高材料的韧性。更多还原

【Abstract】 The reaction mechanism,microstructural feature, fracture surface morphology and thermal-mechanical properties of a system consisting of butadiene-acrylonitrile rubber with radom carboxyl groups, epoxy resin of diglycidyl ether of biphenol A ( DGEBA ) and 2-ethyl-4-methylimidazol ( EMI-2, 4) were investigated.If was demostrated that DGEBA type epoxy resin can be toughened by incorporating a small amount of rubber and the toughened epoxy resin shows improved toughness without significantly decreasing thermal and mechanical properties. There may be three essential reactions occurring in the system of butadiene-acrylonitrile rubber with radom carboxyl groups and epoxy resin of DGEBA type in the presence of EMI-2, 4.The toughened epoxy resin system is a two-phase system and each domain has an interface well bonded to the matrix. The rubbery domains in the toughened epoxy resin system can serve as nuclei for crack brenches,thus improve the toughness by dissipating the strain energy that causes the crack to propagate.更多还原