将一种环氧树脂和表面羟基化的多壁碳纳米管(MWCNTs)按照质量比100:0.1进行配比,以超声波分散法制备MWCNTs/环氧树脂胶黏剂,考察了两种硅烷偶联剂KH550和KH560对MWCNTs改性效果的影响.采用FTIR、DSC、DMA、流变仪研究了MWCNTs对胶黏剂固化行为和流变特性的影响,并结合断口形貌观察,测试分析了MWCNTs对胶黏剂拉伸剪切强度和冲击强度的影响.结果表明:硅烷偶联剂能与MWCNTs表面的羟基发生缩合反应,增强了MWCNTs与环氧树脂基体的亲和性,从而影响胶黏剂固化反应及黏度-剪切速率曲线;经KH550改性的MWCNTs明显提高了胶黏剂与金属的界面粘结性,Al-Al拉伸剪切强度较无MWCNTs的胶黏剂提高了46.4%;添加MWCNTs使胶黏剂的冲击断面更为粗糙,开裂面积更大;添加MWCNTs+KH550的胶黏剂冲击强度提高了44.1%,说明MWCNTs/环氧树脂间界面性能对发挥MWCNTs的增韧效果非常重要.
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