中文摘要：

聚酰亚胺纳米复合薄膜（100CR）具有良好的耐电晕性能，但其耐电晕机理尚缺乏系统研究。为探明添加无机纳米粒子对聚酰亚胺薄膜耐电晕性能的影响，分别从薄膜结构、介电性能、纳米添加剂高热导性能3个方面研究了100CR薄膜的耐电晕机理。实验结果表明：100CR薄膜呈3层结构，无机纳米粒子集中在薄膜表层，对内部聚酰亚胺分子结构起到很好的保护作用；添加纳米粒子可以提高薄膜的介电常数，提高无机纳米粒子一聚合物界面处的势垒高度，减少电荷注入，还可以提高薄膜的电导率和热导率，加快电荷衰减速度，并减小薄膜中的深陷阱密度。此外，100CR薄膜热导率的提高使热量更容易散出，降低了热击穿的危险以及局部放电对绝缘材料的破坏作用，并减小了空间电荷的注入深度和密度。

英文摘要：

It is reported that polyimide nano-composite film （100CR） has good resistance against corona, yet the mechanism of this resistance is not systematically researched. To investigate how inorganic nanoparticles addition influences the corona resistance of polymide films, we experimentally studied the mechanism of 100CR film against corona from three aspects, namely film structure, dielectric properties, and high thermal conductivity. The experimental results show that 100CR film is composed of three layers, of which the surface layer gathers the major part of inorganic nanoparticles and it protects the interior molecular structure of polyimide. In the meantime, adding the nanoparticles cannot only increase the film＇s dielectric constant but also heighten the energy barrier of nanoparticle-polymer interface to suppress the charge injection; the addition also increases both the film＇s electrical conductivity and thermal conductivity, which accelerates the charge decay and reduces the deep traps in the film. In addition, the heat in 100CR film is more easily dissipated due to the enhanced thermal conductivity, so the risk of thermal breakdown and the damage of partial discharge to the insulation material are lowered, and the injection depth and density of space charge are reduced.