ABSTRACT
The addition ofAl2O3 nanoparticles can effectively improve corona-resistance property and the PI/Al2O3 nanocomposite serves as a typical kind of engineering insulating materials in the manufacture of electric motors (Wu, Yang, Gao, Hu, Liu & Fan 2005; Hui et al. 2016; Du, He, Du & Guo 2016; Akram, Gao, Liu, Zhu, Wu & Zhou 2015). It is well known that the operating temperature will increase during the operation of electric motor. While the existing research for corona-resistance property of PI composites mainly aims at the room temperature, which is not enough for manufacture and application of electric motors. Meanwhile, to see the thermal and electrical effects on the insulation life of electric motor, as reported earlier, the accelerated aging test is always carried out at room temperature and high temperature ranging from 100 to 150◦C (Haq, Jayaram&Cherney 2008). Therefore, it has a practical significance to investigate the effect of temperature on corona-resistance property of PI/Al2O3 nanocomposite film.
