论文部分内容阅读
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。
An epoxy resin and surface-hydroxylated MWCNTs were mass ratio of 100: 0.1, MWCNTs / epoxy adhesive was prepared by ultrasonic dispersion method. Two kinds of silane coupling Effect of KH550 and KH560 on Modification of MWCNTs. The effects of MWCNTs on the curing behavior and rheological properties of the adhesive were studied by FTIR, DSC, DMA and rheometer. Combined with the observation of the fracture morphology, the effects of MWCNTs on the tensile shear strength and impact strength influences. The results show that the silane coupling agent can condense with the hydroxyl groups on the surface of MWCNTs and enhance the affinity between the MWCNTs and the epoxy resin matrix, thus affecting the curing reaction and the viscosity-shear rate curve. MWCNTs significantly improve the interfacial adhesion between the adhesive and the metal. The tensile shear strength of Al-Al is 46.4% higher than that of the non-MWCNTs adhesive. The addition of MWCNTs makes the impact cross section of the adhesive more rough and the cracking area The MWCNTs + KH550 adhesive strength increased by 44.1%, indicating that the interfacial properties of MWCNTs / epoxy resin are very important for the toughening effect of MWCNTs.