【作者】 杨国瑞； 黄志雄； 石敏先； 郦亚铭；

【Author】 YANG Guo-rui HUANG Zhi-xiong SHI Min-xian LI Ya-ming (School of Material Science and Engineering,Wuhan University of Technology,Wuhan 430070,China)

【机构】 武汉理工大学材料科学与工程学院；

【摘要】 研究了某种环氧树脂阻尼灌封胶在热氧老化的作用下分子结构、硬度、断面形貌以及动态力学性能随时间的变化．傅立叶红外光谱图表明,所制备的样品环氧基团反应比较完全,热氧老化后试样表面由仲胺和环氧基团形成的酯键发生了部分断裂和氧化；邵氏硬度的增加、T_g向高温区移动则表明在老化过程中复杂的固化反应仍然继续进行；最大损耗因子(tanδ_max)波动较小表明试样老化后分子结构几乎保持不变；SEM 图片显示试样的冲击断裂由老化前的韧性转变为老化后的脆性断裂．更多还原

【Abstract】 The effects of accelerated thermo-oxidative aging treatment on molecular structure,hardness,morpfology of fractured surface and dynamic mechanical property of a damped-encapsulating epoxy adhesive were investigated.FT-IR indicated epoxy resin had been nearly reacted and the formation of a small quantity of amide group at the surface during the thermo-oxidative aging treatment because of the partial break and oxidation of ester bond conformed by secondary amine and oxirane group.The increase of Shore’s hardness and shift of T_g to higher temperature shows a futher complicated curing reaction during aging treatment.The maximum value of tanδ just fluctuated in a narrow range, molecular structure of the sample was almost unchanged.SEM graphs suggested the change from some toughness to rigidity.更多还原