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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%。
An aqueous solution containing carbon nanotubes (CNTs) was prepared. Carbon fibers were impregnated with the aqueous solution as an infiltrant and dried. The effects of CNTs content and infiltration process on the distribution of CNTs on the surface of carbon fiber were investigated by scanning electron microscopy (SEM) and atomic force microscopy (AFM) Influence, using monofilament fracture method analysis CNTs infiltration agent on the carbon fiber / epoxy interface bonding performance and mechanism of action. The results showed that CNTs could adhere on the surface of T700 and T300 fibers. The higher the content of CNTs in the sizing agent, the higher the content of CNTs on the fiber surface. For the sizing agent with lower content of CNTs, the number of infiltration could increase the surface of carbon fiber CNTs content and carbon fiber surface roughness. After CNTs infiltration agent treatment, the mechanical meshing effect at the carbon fiber / resin interface is enhanced, and the interfacial bonding strength obviously increases by 35.8%.