高等学校化学学报

高等学校化学学报 ›› 2005, Vol. 26 ›› Issue (5): 952.

• 研究论文 • 上一篇    下一篇

炭黑填充聚甲基乙烯基硅氧烷硫化胶的阻温特性与电阻弛豫

陈永良1, 宋义虎1, 郑强2   

  1. 1. 浙江大学高分子科学与工程学系, 杭州310027;
    2. 中山大学材料科学研究所, 广州510275
  • 收稿日期:2004-05-27 出版日期:2005-05-10 发布日期:2005-05-10
  • 通讯作者: 郑　强(1960年出生),男,博士,教授,博士生导师,主要从事多组分聚合物体系结构与性能及聚合物流变学研究.E-mail:zhengqiang@zju.edu.cn E-mail:zhengqiang@zju.edu.cn
  • 基金资助:

    国家自然科学基金重点项目(批准号:50133020);国家杰出青年科学基金(批准号:50125312)资助.

Resistivity-temperature Properties and Resistivity Relaxation of Carbon Black Filled Poly(methyl vinyl siloxane) Vulcanite

CHEN Yong-Liang1, SONG Yi-Hu1, ZHENG Qiang2   

  1. 1. Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China;
    2. Institute of Material Science, Zhongshan University, Guangzhou 510275, China
  • Received:2004-05-27 Online:2005-05-10 Published:2005-05-10

PDF (PC)

被引次数

9

摘要： 研究了炭黑填充硅橡胶硫化胶的热循环以及热处理过程中的导电行为,发现在热循环中阻温关系曲线逐渐向低电阻方向移动,而在恒温下发生电阻弛豫现象;分析了硫化胶的导电机制,讨论了阻温关系发生移动的原因.

关键词: 炭黑, 聚甲基乙烯基硅氧烷, 热循环, 阻温特性, 电阻弛豫

Abstract: The conduction behavior of carbon black(CB) filled poly(methyl vinyl siloxane)(PMVS) vulcanites undergoing thermal cycles or subject to thermal treatment at given temperatures was investigated. The conduction behavior in PMVS/CB crosslinked composites at room temperature followed the prediction of the statistical percolation theory. The negative temperature coefficient(NTC) effect of resistivity corresponded to thermal activation conduction mechanism, while the positive temperature coefficient(PTC) effect was related to the breakdown of conductive network caused by volume expansion. The results revealed that the resistivity-temperature properties during the thermal cycles was gradually changed towards low-resistance, while the change of resistance with variation of time at given temperatures exhibited resistivity relaxation behavior. The conductive mechanisms and corresponding changes in the structure of PMVS/CB responsible for the resistivity-temperature behavior were discussed. At given temperatures, the tesistance relaxation was strengthened with decreasing CB weight fraction. On the other hand, it is strengthened with increasing ambient temperature at given CB fractions.

Key words: Carbon black, Poly(methyl vinyl siloxane), Thermal cycle, Resistivity-temperature characteristic, Resistivity relaxation

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