基于功能化改性氧化石墨烯增强环氧树脂复合材料性能研究

Study on Performance of Functionalized Modified Graphene Oxide Reinforced Epoxy Resin Composites

研究了γ-氨丙基三乙氧基硅烷和辛基缩水甘油醚对氧化石墨烯(GO)表面有机功能化改性的办法,并通过机械搅拌和超声分散制备了改性GO增强环氧树脂(EP)复合材料。采用FT-IR、XPS、SEM、TG对改性前后GO表面结构及改性GO在EP中的剥离分散性进行了表征分析。测试了改性GO增强EP浇铸体复合材料冲击性能、弯曲性能、拉伸性能和热稳定性。结果表明,烷基功能化改性的GO表面成功接枝了含氧活性基团和烷基分子链结构,在EP中具有较好的浸润分散性和界面结合能力。改性GO增强EP复合材料的韧性和耐热性显著增强,添加1.5wt.%改性GO的EP复合材料冲击强度、弯曲强度和拉伸强度相对纯EP分别上升了67.7%、31.2%和31.7%。

In this paper,the process of organic functional modification for Graphene Oxide(GO)surface by usingγ-Aminopropyltriethoxysilane and 2-Ethylhexylglycidylether was studied.The modified GO reinforced Epoxy Resin(EP)composites were also prepared by mechanical stirring and ultrasonic dispersion.The surface structure of GO before and after modification as well as the peeling dispersion of modified GO in EP were characterized and analyzed through FT-IR,XPS,SEM and TG.The impact properties,flexural properties,tensile properties and thermal stability of modified GO reinforced EP composites were tested.The results showed that the surface of modified GO was successfully grafted with oxygen-containing active groups and alkyl molecular chain structure,which showed better dispersing properties and interfacial bonding ability in EP matrix.The toughness and heat resistance of modified GO reinforced EP composites are significantly enhanced.The impact strength,flexural strength and tensile strength of EP composites with 1.5 wt.%modified GO have increased by 67.7%,31.2%and 31.7%respectively relative to pure EP.