碳纤维表面改性对复合材料性能的影响

Effect of Carbon Fiber Surface Modification on Properties of Composites

采用氨基硅烷偶联剂对碳纤维进行表面改性,并以改性前后的碳纤维分别作为增强纤维,以尼龙66(PA66)树脂作为基体制成复合材料。采用X-射线衍射(XPS)、扫描电子显微镜(SEM)、动态机械性能分析(DMA)、力学性能测试等手段对复合材料界面的结构与性能进行了表征。研究了碳纤维表面改性对复合材料性能的影响,结果表明:碳纤维改性后表面活性官能团数增加,O—C=O和C=O的含量分别增加了95.24%和508.45%;碳纤维表面粗糙度增加,且与热塑性PA66树脂之间的结合强度显著增强;同时,改性后复合材料的的力学性能提升,弯曲强度和弯曲模量分别提升了30 MPa和424 MPa,冲击强度提高了6 MPa,储能模量显著增加,玻璃化转变温度提高约5℃。

The surface of carbon fiber（CF）was modified by aminosilane coupling agent and introduced into polyamide 66（PA66）resin.XPS,SEM,DMA and mechanical performance tests were used to characterize the structure and properties of the interface of composites.The effect of carbon fiber surface modification on the properties of the composites were studied.Results showed that the surface active functional groups increased after modification,such as the content of O—C=O and C=O,which were increased by 95.24% and 508.45% respectively.The surface modification increased the surface roughness of carbon fiber and enhanced the bonding strength between the fiber and the thermoplastic resin.The addition of modified carbon fiber improved the mechanical properties compared to virgin carbon fiber.Simultaneously,the flexural strength and modulus were increased by 30 MPa and 424 MPa respectively,and impact strength was increased by 6 MPa.The storage modulus increased significantly,and the glass transition temperature increased nearly 5 ℃.