Bhutta Muhammad Shoaib, Akram Shakeel, Meng Pengfei, Castellon Jerome, Agnel Serge, Li Hui, Guo Yecai, Rasool Ghulam, Hussain Shahid, Nazir Muhammad Tariq
Binjiang College, Nanjing University of Information Science & Technology, Wuxi 214105, China.
College of Electrical Engineering, Sichuan University, Chengdu 610065, China.
Polymers (Basel). 2021 Feb 21;13(4):640. doi: 10.3390/polym13040640.
The steady-state electrical conduction current for single and multilayer polyimide (PI) nanocomposite films was observed at the low and high electric field for different temperatures. Experimental data were fitted to conduction models to investigate the dominant conduction mechanism in these films. In most films, space charge limited current (SCLC) and Poole-Frenkel current displayed dominant conduction. At a high electric field, the ohmic conduction was replaced by current-voltage dependency. Higher conduction current was observed for nanocomposite films at a lower temperature, but it declined at a higher temperature. PI nanocomposite multilayer films showed a huge reduction in the conduction current at higher electric fields and temperatures. The conclusions derived in this study would provide the empirical basis and early breakdown phenomenon explanation when performing dielectric strength and partial discharge measurements of PI-based nanocomposite insulation systems of electric motors.
在不同温度下，在低电场和高电场下观察了单层和多层聚酰亚胺（PI）纳米复合薄膜的稳态导电电流。将实验数据拟合到导电模型中，以研究这些薄膜中的主导传导机制。在大多数薄膜中，空间电荷限制电流（SCLC）和普尔-弗伦克尔电流表现为主导传导。在高电场下，欧姆传导被电流-电压依赖性所取代。在较低温度下观察到纳米复合薄膜具有较高的传导电流，但在较高温度下其下降。PI纳米复合多层薄膜在较高电场和温度下显示出传导电流的大幅降低。本研究得出的结论将为进行电动机基于PI的纳米复合绝缘系统的介电强度和局部放电测量时提供经验基础和早期击穿现象的解释。
