多元碳纳米材料协同改性玻璃微珠/环氧树脂复合材料

采用静电自组装法制备了还原氧化石墨烯表面修饰中空玻璃微珠（rGO@HGB），与导电炭黑（CB）、石墨烯纳米片（GNPs）一起与环氧树脂（EP）共混，制备了CB-GNPs-rGO@HGB/EP复合材料，并系统研究了复合材料的微观结构、导电性能和介电性能。结果表明，rGO@HGB的加入能够显著提高rGO@HGB/EP复合材料的导电性能和介电常数，进一步引入CB和GNPs后，形成了被rGO@HGB隔离的导电逾渗网络，rGO、CB和GNPs三者对提高CB-GNPs-rGO@HGB/EP复合材料性能具有协同作用。在CB与GNPs的总含量固定为0.2vol%，且二者的体积比为10:1时，CB-GNPs-rGO@HGB/EP复合材料的导电与介电性能最优，对应的体积电阻率为1.88×104 Ωcm，在1 kHz下的介电常数高达454.5，分别比CB-rGO@HGB/EP和GNPs-rGO@HGB/EP复合材料提高了11.3%和10.7%，而其介电损耗仅为0.065。 

Synergistic modification of glass beads/epoxy composites with multi-carbon nanomaterials

The surface-modified hollow glass beads with reduced graphene oxide(rGO@HGB)were prepared by electrostatic self-assembly method and then blended with conductive carbon black(CB),graphene nanoplates(GNPs)and epoxy resin(EP),and were further used to prepare CB-GNPs-rGO@HGB/EP composites.The microstructure,conductivity properties and dielectric properties of the CB-GNPs-rGO@HGB/EPcomposites were systematically studied.The results show that rGO@HGB can significantly improve the electrical conductivity and dielectric constant of rGO@HGB/EP composites.After further addition of CB and GNPs,a segregated conductive percolation network is formed by rGO@HGB.There are efficient synergistic effects of rGO,CB and GNPs on improving the properties of CB-GNPs-rGO@HGB/EP composites.With 0.2 vol% CB-GNPs at the volume ratio of 10∶1,the properties of CB-GNPs-rGO@HGB/EP composites are optimal with the volume resistivity of 1.88×10^4Ω·cm and the dielectric constant of 454.5 at 1 kHz,which is 11.3% and 10.7% higher than that of CB-rGO@HGB/EP and GNPs-rGO@HGB/EP composites,respectively,while the dielectric loss is only 0.065.