PAA短链处理纳米粒子改性PI薄膜的介电性能  

Dielectric Properties of Polyimide Films Modified by Nano-particles Treated with Short-chain PAA Molecules

作　　者：范勇[1] 谢艳红[1] 赵伟[1] 杨瑞宵[1] 陈昊[1] 

机构地区：[1]哈尔滨理工大学材料科学与工程学院,黑龙江哈尔滨150040

出　　处：《哈尔滨理工大学学报》2015年第5期56-60,共5页Journal of Harbin University of Science and Technology

基　　金：国家自然科学基金(51277044)

摘　　要：制备理论平均聚合度不同的聚酰胺酸短链分子用来处理纳米粒子,把经过处理的纳米分散液与高聚合度聚酰胺酸溶液纳米掺杂,再用流延法制得改性的纳米复合聚酰亚胺薄膜.通过介电谱、电导电流和耐电晕测试,研究不同聚合度聚酰胺酸短链分子处理纳米粒子对PI薄膜介电性能的影响.结果表明:随着聚酰胺酸短链分子理论平均聚合度的增加,复合薄膜介电系数逐渐增大,介电损耗逐渐变小,电老化阈值逐渐增大.在试验调整范围内,复合薄膜的耐电晕寿命随着聚酰胺酸短链分子理论平均聚合度的增加逐渐减小,但是变化幅度不太大,且均高于未用聚酰胺酸短链分子处理的薄膜.Nanoparticles were treated by short-chain polyamide acid molecules of different theoretical average polymerization degrees, and the treated nano dispersion liquid was incorporated polyamide acid solution of high pol- ymerization degree, then nano-composite films of polyimide were prepared by tape-casting. The dielectric properties of dielectric spectra, conduction current and corona-resistant were made, to figure out the influence of the short- chain polyamide acid molecules of different polymerization degrees on the dielectric properties of nano-composite films. The results show that： with the increasing of theoretical average polymerization degree, the dielectric con- stant gradually increase, and the dielectric loss decrease, the electrical degradation threshold increase. The films show longer corona resistance time than the film without being treated, and with the increasing of theoretical average polymerization degree, the corona resistant time gradually decline.

关 键 词：聚酰胺酸短链分子 介电性能 载流子陷阱 

分 类 号：TM215.3[一般工业技术—材料科学与工程]