文献类型：期刊文献

中文题名：炭黑填充聚合物体系渗流转变过程中的介电性能

英文题名：Dielectric Property of Carbon Black Filled Polymer Composites in Percolation Transition

作者：倘余昌[1];刘星[1];孔兰芳[1];吴国章[1]

机构：[1]华东理工大学材料学院,上海200237

年份：2012

卷号：28

期号：7

起止页码：72

中文期刊名：高分子材料科学与工程

外文期刊名：Polymer Materials Science & Engineering

收录：CSTPCD;;EI(收录号：20124315599403);Scopus;北大核心:【北大核心2011】；CSCD:【CSCD2011_2012】；

语种：中文

中文关键词：炭黑;导电复合材料;介电性能;动态渗流

外文关键词：carbon black; conductive composites; dielectric property; dynamic percolation

摘要：采用熔融共混的方法制备了导电炭黑填充乙烯-醋酸乙烯酯共聚物复合体系,分别通过添加填料粒子和熔融态等温处理促进粒子凝聚成网两种方法研究了体系在渗流转变过程中的电性能变化,发现在该过程中材料的导电性能和介电性能均持续上升,伏安特性和相位角分析表明粒子间始终为非欧姆接触。动态渗流测试发现,复合体系从绝缘体到导体的整个渗流转变过程中介电常数是持续增加的。因此渗流理论所预测的介电常数极大值很可能发生在临界含量的上限值,此时材料的导电机理转变为欧姆传导。
n black filled ethylene vinyl-acetate copolymer composites were prepared via melt compounding.Two methods,i.e.,randomly adding filler and isothermal annealing an unpercolated composite sample in molten state to promote the formation of percolation network by nanoparticle self-aggregation,were adopted in order to observe the evolution of dielectric property of the composites system during percolation transition.It showed that electrical conductivity and dielectric constant increased continuously during percolation transition.Current-voltage characteristics and phase angle of the composites indicated a non-ohmic contact between carbon black particles in the composites.Dynamic percolation measurement of the unpercolated sample supported that dielectric constant increased continuously during percolation transition.The results assured that the dielectric singularity predicted by percolation theory will happen at the transition from non-ohmic to ohmic contact between the conductive filler.