北京航空航天大学学报 ›› 2015, Vol. 41 ›› Issue (6): 1049-1054.doi: 10.13700/j.bh.1001-5965.2014.0427

• 论文 • 上一篇    下一篇

改性聚酰亚胺复合材料的电导机理分析

雷伟群, 乌江, 彭平, 杨沛, 郑晓泉   

  1. 西安交通大学 电力设备电气绝缘国家重点实验室, 西安 710049
  • 收稿日期:2014-07-17 出版日期:2015-06-20 发布日期:2015-07-30
  • 通讯作者: 郑晓泉(1954—),男,陕西咸阳人,教授,xqzheng@mail.xjtu.edu.cn,研究方向为极端条件下介质材料放电防护. E-mail:xqzheng@mail.xjtu.edu.cn
  • 作者简介:雷伟群(1989—),男,陕西渭南人,博士研究生,leiweiqun.cn@stu.xjtu.edu.cn
  • 基金资助:
    国家自然科学基金(51377126)

Conduction mechanism analysis of modified polyimide composite

LEI Weiqun, WU Jiang, PENG Ping, YANG Pei, ZHENG Xiaoquan   

  1. State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, China
  • Received:2014-07-17 Online:2015-06-20 Published:2015-07-30

摘要: 首先,选用半导电的微米级和纳米级改性剂粉料对玻璃布补强聚酰亚胺基复合材料进行改性.共制备了5种试样,其中包括4种使用无碱玻璃布补强的聚酰亚胺试样,分别是未改性、纳米改性、微米改性和微/纳米改性和一种使用微碱玻璃布补强的试样.其次,研究改性剂粒径和玻璃布含碱量对复合材料介电性能及电导率特性的影响.试验结果表明改性剂粒径对复合材料的介电性能影响不显著,但是微米粒径的改性剂能显著提高复合材料的体电导率并赋予复合材料一定的非线性电导率特性,而纳米粒径的改性剂会小量地降低复合材料的电导率.与无碱玻璃布补强的试样相比,采用微碱玻璃布改性和补强的复合材料试样有较高的非线性电导阈值电场.

关键词: 改性剂, 聚酰亚胺, 玻璃布, 介电性能, 非线性电导率特性

Abstract: Firstly, semi-conductive granules in different diameters from nanometer to micron were used to modify polyimide resin that strengthened by glass fabric. Four kinds of polyimide resin with non-alkalis glass fibers were produced, including the original, micro-filler, nano-filler, and micro/nano-filler modified samples; besides, one kind of polyimide resin with glass fabric that contained small amount of alkalis was prepared as well. The dielectric properties and non-linear conductivity property of all the samples were tested. As a result, it is discovered that the size of filler has little influence on materials' dielectric properties. However, fillers in nanometer decrease a bit of the volume conductivity of the materials, while those in micrometer not only make it increase obviously but also change it into non-linear conductivity. Furthermore, comparing with samples strengthened by non-alkalis glass fabric, the threshold electric field of non-linear conductivity of the polyimide resin strengthened by the glass fabric with small amount of alkalis has a distinct decrease.

Key words: modifier, polyimide, glass fabric, dielectric property, non-linear conductivity characteristic

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