多巴胺掺杂碳纳米管对芳纶纤维界面性能的影响

Effects of Dopamine-doped Carbon Nanotubes on the InterfacialProperties of Aramid Fiber

为改善芳纶纤维表面性能,提高纤维与树脂基体之间的界面结合强度,采用多巴胺掺杂碳纳米管对芳纶纤维进行改性处理,并对改性前后的芳纶纤维进行表面形貌观察、FTIR测试、单纤维强力测试、纤维表面接触角测试以及纤维抽拔测试。结果表明,多巴胺(DA)掺杂碳纳米管(CNT)改性的纤维表面涂层牢固度提高,与未改性的纤维相比,纤维表面活性基团增加,其中,碳纳米管浓度为0.03%的改性纤维的拉伸断裂强度提高38.34%,接触角减小,表面自由能提高49.5%,界面剪切强度增加20.2%,纤维与树脂基体之间的界面性能大大改善。

In order to improve the surface properties of aramid fiber and enhance the interfacial bonding strength between fiber and resin matrix,dopamine-doped carbon nanotubes were used to modify the aramid fiber,and the surface morphology,FTIR test,single fiber strength test,fiber surface contact angle test and fiber pull out test were carried out before and after modification.The results showed that the dopamine-doped carbon nanotube(CNT)modified fiber surface coating was improved in firmness.Compared with the unmodified fiber,the surface active groups of the fiber increased,and when the carbon nanotube concentration was 0.03%,the tensile breaking strength of the modified fiber increased 38.34%,the contact angle decreased,the surface free energy increased 49.5%,the interface shear strength increased 20.2%,and the interface performance between the fiber and the resin matrix was greatly improved.