碳纳米管浸润剂对碳纤维/环氧树脂界面性能的影响

制备了含碳纳米管(CNTs)的水溶液, 将该水溶液作为浸润剂浸渍碳纤维并进行烘干, 采用扫描电镜(SEM)和原子力显微镜(AFM)研究了CNTs含量及浸润工艺对碳纤维表面CNTs分布的影响, 运用单丝断裂法分析了CNTs浸润剂处理对碳纤维/环氧树脂界面粘结性能的影响和作用机制。结果表明: CNTs可在T700和T300纤维表面黏附, 浸润剂中CNTs含量越高, CNTs在纤维表面含量越高; 对于CNTs含量较低的浸润剂, 采用增加浸润次数的方法, 能有效提高碳纤维表面CNTs的含量和碳纤维表面粗糙度; 经过CNTs浸润剂处理后, 碳纤维/树脂界面处的机械啮合作用增强, 界面粘结强度明显提高, 增幅最高达35.8%。

Effects of wetting agent containing carbon nanotubes on interfacial property of carbon fiber/epoxy resin

The wetting agent containing carbon nanotubes(CNTs) and deionized water was prepared,in which carbon fibers were infiltrated,and then dried.The effects of CNTs content and infiltrating process on CNTs distribution on the surfaces of carbon fibers were studied by means of SEM and AFM.The influence of CNTs wetting agent on the interface bonding property of carbon fiber/epoxy resin and the mechanism were investigated using single fiber fragmentation test.The results show that T700 and T300 carbon fibers can be coated with CNTs after infiltrated in the wetting agent and the content of CNTs on the surfaces is higher using the wetting agent with higher content of CNTs.For the wetting agent with low content of CNTs,the method of increasing infiltrating times is an effective way to increase the CNTs content and roughness of carbon fiber surfaces.The interface bonding strength of carbon fiber/epoxy resin is obviously improved by 35.8% at maximum after carbon fiber being infiltrated in the CNTs wetting agent,resulting from the enhancement of mechanical interlocking at the interphase regions.