摘要
采用聚丙烯(PP)和高密度聚乙烯(HDPE)共混物为基体材料,以石墨为导电填料,通过熔融共混法制备了导电复合材料。重点研究了石墨在两相基体中的分散情况以及复合体系的电学性能。扫描电镜测试结果表明:石墨粒子选择性的分散在共混物基体中,构成双渗流导电网络结构。电性能测试结果显示:在相同石墨含量下双基体体系的室温电阻率与GP/HDPE相比下降了1~4个数量级。同时,双渗流导电网络结构的存在部分消除了负温度系数(NTC)效应,提高了热循环稳定性。
The conductive composites were prepared by melt blending with conductive graphite(GP),polypropylene(PP) and polyethylene(PE).The dispersion of graphite in the two phase matrix and the electrical properties of the composite were investigated.SEM result indicates that the graphite particles are selectively located in the matrix,the double-percolated networks reduce the percolation threshold and improve the conductivity.Compared with GP /HDPE-PP composite,the volumatic resistivity of composites decreases by 1—4 orders of magnitude at the same filler content.Meanwhile,the negative temperature coefficient effect is inhibited and the stability of the electrical properties is improved,due to the existence of the double-percolated networks.
出处
《化学工业与工程》
CAS
2012年第2期15-19,共5页
Chemical Industry and Engineering
关键词
石墨
导电复合材料
双渗流网络
电学性能
graphite
conductive polymer composite
double-percolated network
electrical properties