氟化改性石墨烯纳米片对环氧树脂复合材料沿面耐压性能的影响

Effect of Fluorinated Modified Graphene Nanoplatelets on Surface Voltage Resistance Properties of Epoxy Resin Composites

环氧树脂(epoxy resin,EP)的氟化纳米改性是提升复合绝缘材料沿面耐压性能的重要手段。该文对石墨烯纳米片(graphene nanoplatelets,GNPs)分别进行等离子体氟化、化学氟化与等离子体–化学协同氟化3种不同形式的改性处理,探究不同氟化方式对含氟界面层的影响,并揭示其对EP复合材料直流沿面耐压性能的提升机理。结果表明:3种氟化石墨烯纳米片均对EP复合材料沿面闪络电压有提升效果。进一步对EP复合材料表面电荷消散情况及陷阱分布特性进行分析,发现不同接枝形式的GNPs对EP复合材料沿面耐压性能的提升机制存在差异。填料GNPs与EP基体间有效键合作用的形成,可以促进电荷沿GNPs的输运,从而影响EP复合材料的沿面耐压性能。

Fluorinated nano-modification of epoxy resin(EP)is an essential means to improve the surface voltage resistance properties of composite insulating materials.In this paper,the graphene nanoplatelets(GNPs)are modified in three different forms,including plasma fluorination,chemical fluorination and plasma-chemical synergistic fluorination.By exploring the influence of different fluorination methods on the fluorine-containing interfacial layers,the mechanism of EP composites’DC surface voltage resistance properties can be revealed.The results show that doping the three fluorinated graphene nanoplatelets improves the surface flashover voltage of EP composites.By further analyzing the surface charge dissipation and trap distribution of EP composites,it is found that different grafting forms of GNPs have different mechanisms for improving the surface voltage resistance properties of EP composites.The formation of effective bond between GNPs and EP matrix can promote the charge transport along GNPs,thus affecting the surface voltage resistance of the EP composites.