中文摘要：

为提高聚酰亚胺纳米复合薄膜的耐电晕性能,利用大气压空气等离子体和硅烷偶联剂对纳米粒子表面进行改性,通过原位聚合法制备聚酰亚胺纳米复合薄膜,利用傅里叶红外光谱（FTIR）分析等离子体处理对纳米粒子表面化学键的影响,利用扫描电镜（SEM）分析了纳米粒子在薄膜中的分散特性,测试了聚酰亚胺纳米复合薄膜的介电频率谱和耐电晕时间。研究结果表明：纳米粒子经过等离子体处理后,通过氢键在其表面吸附大量的硅烷偶联剂,薄膜内团聚体颗粒大小下降了约60%;复合薄膜的介电常数有所下降,但电导损耗有所增加,纳米复合薄膜耐电晕寿命提高了28.12%。研究发现,等离子体改性纳米粒子后,增强了纳米粒子和聚合物基体的相互作用,提高了界面的耐电晕能力,同时增加了薄膜内界面体积分数,使界面区域介电双层结构发生重叠,提高了薄膜的电导率,促进薄膜内部电荷的消散,从而提高了薄膜的耐电晕寿命。

英文摘要：

In order to improve the corona resistance of polyimide（PI） nanocomposite films, the surface of nanoparticles was modified by atmospheric pressure air plasma and silane coupling agent. The polyimide nanocomposite films were prepared by in-situ polymerization. Moreover, the effect of plasma treatment on the surface chemical bonds of nanoparticles was analyzed by Fourier transform infrared spectroscopy（FTIR）, and the dispersion property of nanoparticles in the film was analyzed by scanning electron microscopy（SEM）. The dielectric frequency spectrum and corona resistance time of the polyimide nanocomposite film were tested. The results indicate that, after the treatment of nanoparticles with plasma, lots of silane coupling agents are adsorbed on the surface by hydrogen bonding,the size of aggregates in the film is decreased by 60%. The dielectric constant of the composite film decreases while the conductance loss increases, the corona resistance time of PI composite film is increased by 28.12%. It is found that, after the modification, the interaction between nanoparticles and polymer matrix is enhanced, so the corona resistance of the interface is improved, meanwhile, the interfacial volume fraction of the films is increased and the dielectric bilayer structure overlaps, which makes the conductivity of the film improved and it promotes the dissipation of charge inside the film, so that the corona resistance life of the film is improved.