氧化石墨烯改性玄武岩纤维及其增强环氧树脂复合材料性能

为了改善玄武岩纤维/环氧树脂复合材料的界面性能,通过偶联剂对氧化石墨烯进行改性,并将改性后的氧化石墨烯引入到上浆剂中对玄武岩纤维进行表面涂覆改性,同时制备了氧化石墨烯-玄武岩纤维/环氧树脂复合材料.采用FTIR表征了氧化石墨烯的改性效果;运用SEM分析了改性上浆剂处理对玄武岩纤维表面及复合材料断口形貌的影响和作用机制.结果表明:偶联剂成功接枝到氧化石墨烯表面;玄武岩纤维经氧化石墨烯改性的上浆剂处理后,表面粗糙度及活性官能团含量增加,氧化石墨烯-玄武岩纤维/环氧树脂界面处的机械齿合作用及化学键合作用增强,界面黏结强度得到改善,玄武岩纤维的断裂强力提高了30.8%,氧化石墨烯-玄武岩纤维/环氧树脂复合材料的层间剪切强度提高了10.6%.

Basalt fiber modified with graphene oxide and properties of its reinforced epoxy composites

To improve the interfacial properties of basalt fiber/epoxy composites, the graphene oxide modified with coupling agent was introduced into sizing agent, and the modified sizing agent was used to modify basalt fiber and the graphene oxide-basalt fiber/epoxy composites were prepared. The modification effect of graphene oxide was characterized by FTIR. The effect of modified sizing modification on surface of basalt fiber and composites cross-sectional morphologies and reaction mechanism were investigated using SEM. The results show that coupling agent is successfully grafted onto the surface of graphene oxide. Surface roughness and reactive functional groups are increased after basalt fiber being infiltrated in sizing agent modified by graphene oxide, and the mechanical interlocking and chemical bonding of the graphene oxide-basalt fiber/epoxy interface are enhanced, the interface bonding strength is improved, the fracture strength of basalt fibers is improved by 30.8% and the interlaminar shear strength of graphene oxide-basalt fiber/epoxy composites is improved by 10.6%.