改性聚丙烯与上浆处理对碳纤维表面性能的影响

Effects of Modified Polypropylene and Sizing Treatment on the Surface Properties of Carbon Fibers

使用环氧基上浆剂(EP)和乙烯基上浆剂(VE)对无浆碳纤维进行上浆改性处理,选用聚丙烯(PP)树脂和以马来酸酐接枝聚丙烯(MAPP)为主的改性聚丙烯树脂作为基体树脂,通过扫描电镜(SEM)、傅里叶红外光谱仪(FTIR)、X射线光电子能谱(XPS)和界面剪切性能试验对碳纤维与聚丙烯间的界面结合性能进行分析和研究。结果表明,上浆后无浆CF表面被均匀涂覆一层浆膜;表面的含氧官能团含量增加;树脂基体为常规PP时,EP上浆CF和VE上浆CF与树脂的界面剪切强度(IFSS)较未上浆相比分别提升了8.14%和31.70%;树脂基体为改性PP时,EP上浆CF和VE上浆CF与树脂的IFSS较未上浆相比分别提升了32.51%和36.97%;PP改性后与CF的IFSS均有较大提升。改性PP含有的MAPP可能与碳纤维表面的含氧官能团反应生成新键,与上浆剂共同作用,改善CF与PP树脂的相容性,提升界面结合强度。

Epoxy-based sizing agent(EP)and vinyl-based sizing agent(VE)were used for sizing modification treatment of sizing-free carbon fibers,and polypropylene(PP)resin and maleic anhydride grafted polypropylene(MAPP)-based modified polypropylene resin were selected as the matrix resin,and the interfacial bonding properties between carbon fiber and polypropylene were analyzed and investigated by scanning electron microscopy(SEM),FTIR,X-ray photoelectron spectroscopy(XPS)and interfacial shear performance tests.The results showed that the surface of the sizing-free CF was uniformly coated with a slurry film after sizing,and the content of oxygen-containing functional groups on the surface increased.The interfacial shear strength(IFSS)of the EP-sized CF and VE-sized CF with the resin increased by 8.14% and 31.70% respectively,compared with that of the unsized CF when the resin matrix was conventional PP;the IFSS of the EP-sized CF and VE-sized CF with the resin increased by 32.51% and 36.97% respectively,compared with that of the unsized CF when the resin matrix was modified PP.The IFSS of modified PP with CF both improved greatly.The MAPP contained in modified PP might react with the oxygen-containing functional groups on the surface of carbon fibers to form new bonds,and work together with the sizing agent to improve the compatibility between CF and PP and enhance the interfacial bond strength.