酸化石墨烯改性环氧树脂及其碳纤维复合材料力学性能研究

针对石墨烯在复合材料增强增韧上的应用,对石墨烯进行了酸化处理,采用超声分散方法制备酸化石墨烯/环氧树脂(EP)浇注体,并在此基础上制备了酸化石墨烯/碳纤维(CF)/环氧树脂(EP)复合材料。分别利用红外光谱和透射电镜表征了酸化石墨烯表面结构和微观形貌,利用拉伸、弯曲、冲击等机械测试手段评价了酸化石墨烯改性EP和CF-EP的力学性能,并利用扫描电镜对复合材料拉伸断面形貌进行观察。试验结果表明:石墨烯酸化处理后,成功在表面引入了羟基、羧基等极性基团;酸化石墨烯可对EP和CF/EP进行有效增强增韧,当其添加量为0.2wt%时,EP拉伸强度和冲击强度分别提高了23.3%和109.8%,CF/EP拉伸强度、弯曲强度分别提高了6.0%和10.6%,当酸化石墨烯添加量为0.5wt%时,CF/EP复合材料层间剪切强度提高了7.4%。微观形貌分析表明,酸化石墨烯对CF/EP增强改性主要是通过对EP进行增强增韧,同时提高CF和EP之间的界面性能来实现的。

STUDY OF MECHANICAL PROPERTIES OF ACIDIFICATION GRAPHENE MODIFIED EPOXY RESIN AND ITS CARBON FIBER COMPOSITE

In this paper,for the application of graphene on toughening of composite,the acidification of graphene was conducted.Then,acidification graphene/epoxy resin (EP) casting was prepared by ultrasonic dispersion.Subsequently,acidification graphene/carbon fiber (CF)/epoxy resin (EP) composites were prepared by compression molding.The surface structure and morphology of acidication graphene were characterized by IR and TEM.Mechanical properties of graphene modified EP and CF-EP were evaluated by mechanical test methods such as stretching,bending and impact.And scanning electron microscopy (SEM) was used to observe the morphology of the tensile section of the composites.The results show that the polar groups such as hydroxyl and carboxyl groups were successfully introduced into the surface of the graphene after acidizing treatment.Acidified graphene can effectively strengthen and toughen EP and CF/EP.When the content of acidified graphene was 0.2wt％,EP tensile strength and impact strength increased by 23.2％ and 109.8％,respectively.The tensile strength and the flexural strength of CF/EP composites increased were by 6.0％ and 10.6％,respectively.When the addition amount was 0.5wt％,the ILSS of CF/EP composites were increased by 7.4％.The microstructure analysis showed that acidified graphene can enhance CF/EP,which is mainly achieved by strengthening and toughening the EP,which simultaneously improve the interfacial properties between CF and EP.