Improvement in dielectric constant of carbon black/epoxy composites with separated structure by surface-modified hollow glass beads with reduced graphene oxide
Improvement in dielectric constant of carbon black/epoxy composites with separated structure by surface-modified hollow glass beads with reduced graphene oxide
复制标题
还原氧化石墨烯表面改性空心玻璃珠提高分离结构炭黑/环氧复合材料的介电常数
DOI：
10.1016/j.compscitech.2019.04.003
复制
发表时间：
2019-05-26
影响因子：
9.1
通讯作者：
Zhang, Jian
中科院分区：
文献类型：
--
作者：
Huang, Ting;Ma, Chuan-Guo;Zhang, Jian
采用静电自组装法制备了氧化石墨烯还原中空玻璃微珠(rGO@HGB)，并将其与导电炭黑(CB)和环氧树脂(EP)共混，制备了具有分离结构的CB/rGO@HGB/EP复合材料。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，在CB/rGO@HGB/EP复合材料中，rGO@HGB被排除在EP中，CB粒子分散在EP中，形成三维偏析渗流网络。将RGO包覆在HGB表面，与炭黑隔离的导电网络形成导电桥，对改善HGB的导电性能和介电常数具有有效的协同效应。与CB/EP复合材料相比，CB/rGO@HGB/EP复合材料的渗流阈值显著降低至0.08体积%，导电性大大提高。0.2Vol%CB/RGO@HGB/EP复合材料(600.27)在1 kHz的介电常数是CB/EP复合材料(4.35)的137倍，相应的介电损耗仅为0.08。
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) and epoxy resin (EP), and were further used to prepare the CB/rGO@HGB/EP composites with segregated structure. Then microstructure, conductivity properties and dielectric properties of the composites were studied. The results show that rGO@HGB are excluded from the EP matrix, and CB particles are dispersed in the EP, forming a three-dimensional segregated percolation network in the CB/rGO@HGB/EP composites. rGO is coated on the surface of HGB to form a conductive bridge with the CB segregated conductive network, resulting in an efficient synergistic effect for improvement of conductive property and dielectric constant. Compared with CB/EP composites, the percolation threshold of CB/rGO@HGB/EP composites is significantly reduced to 0.08 vol%, and the electrical conductivity is greatly improved. The dielectric constant of 0.2 vol% CB/rGO@HGB/EP composites (600.27) at 1 kHz is 137 times higher than that of CB/EP composites (4.35), and the corresponding dielectric loss is only 0.08.