【摘要】 <正> 液体端羧基丁腈(CTBN)是环氧树脂的一种优良增韧剂。McGarry等发现其增韧效果与橡胶在环氧体系固化时分相出来的粒子的直径和橡胶粒子与树脂的相互作用有关。余云照等发现CTBN改性环氧胶粘剂因固化剂不同其胶接强度有很大差异,并提出只有当羧基在环氧凝胶前几乎全部与环氧反应才能显示出它的增韧作用。我们认为这里胶接界面问题不可忽略。红外反射吸收光谱法是新近发展起来的一种特殊红外技术,它以较高的灵敏度测出金属表面的吸附物或0.05μ以下的薄膜的结构并能得到它们对金属表面取向的资料。所以用反射吸收红外光谱来研究胶粘剂与被粘金属的界面相互作用将能反映胶接强度诸问题的本质。更多还原

【Abstract】 The interface interaction between epoxy adhesive (E-51) modified with carboxyl-terminated liquied butadiene-acrylonitrile rubber (CTBN) and aluminum surface has been studied by reflection-absorption infrared spectroscopy. Our spectroscopic results indicated that significant difference in the shear strength of adhesive-aluminum joints formed by using imidazole (EWI2,4) and m-phenylene diamine as curing agents can be attributed to their differences, in the interfacial structure. As it was shown from the reflection-absorption spectra, the aluminum film peeled from the latter adhesive joint, i.e. one cured with m-phenylene diamine, is com prised of CTBN as the main component at the interface.更多还原