Epoxy resin/polyetherimide/carbon black conductive polymer composites with a double percolation structure by reaction-induced phase separation
Epoxy resin/polyetherimide/carbon black conductive polymer composites with a double percolation structure by reaction-induced phase separation
复制标题
反应诱导相分离具有双渗流结构的环氧树脂/聚醚酰亚胺/炭黑导电聚合物复合材料
DOI：
10.1177/0021998312446180
复制
发表时间：
2013-04-01
影响因子：
2.9
通讯作者：
Liu, M.
中科院分区：
文献类型：
--
作者：
Ma, C. Guo;Xi, D. Yong;Liu, M.
首次制备了环氧树脂/聚醚酰亚胺/炭黑双逾渗结构导电高分子复合材料。研究了复合材料的电性能、相结构及炭黑的选择性分布。结果表明，在环氧树脂/聚醚酰亚胺/炭黑复合材料中，环氧树脂和聚醚酰亚胺之间存在反应诱导的相分离。在具有16wt%聚醚酰亚胺的共混物中，聚醚酰亚胺相从分散相变为三维连续相，而环氧树脂转化为球状分散相。炭黑在共混物中的选择性分布是几乎所有的炭黑粒子都位于聚醚酰亚胺相中。因此，当炭黑含量达到逾渗阈值时，在聚醚酰亚胺相中形成双逾渗结构。事实上，在具有16重量%聚醚酰亚胺的共混物中，炭黑的逾渗阈值降低至0.5重量%。
A novel double-percolation structural conductive polymer composite based on epoxy/polyetherimide/carbon black was prepared for the first time. The electrical property, phase structure of the composite and the selective distribution of carbon black were investigated. The results show that a reaction-induced phase separation between epoxy and polyetherimide can be observed in epoxy/polyetherimide/carbon black composites. In the blend with 16 wt% polyetherimide, polyetherimide phase changes from a dispersed phase to a three-dimensionally continuous phase, while epoxy converts to a globular dispersed phase. The selective distribution of carbon black in the blends is that almost all carbon black particles are located in polyetherimide phase. Accordingly, a double-percolation structure is formed when carbon black content comes to the percolation threshold in polyetherimide phase. In fact, the percolation threshold of carbon black reduces to 0.5 wt% in the blend with 16 wt% polyetherimide.