Abstract
Polyimide/Al2O3 (PI/Al2O3) nanocomposite films based on pyromellitic dianhydride and 4,4′‐oxydianiline were fabricated by adding different proportions of nano‐Al2O3 inorganic particles via in situ polymerization. Microstructural analysis by scanning electron microscope (SEM) showed that the inorganic particles were homogenously dispersed in the PI matrix when mixed with appropriate amount of nano‐Al2O3. Fourier transform infrared spectroscopy and X‐ray diffraction analysis were also used to investigate the effect of nano‐Al2O3 on the polymerization process. The obtained composite films and pure film were characterized by thermogravimetry analysis, and the experimental results indicated that when comparing with pure film, the nanocomposite films displayed a better thermal stability than the pure one. Moreover, results also showed that the thermal stability of composite films steadily improved with increased content of nano‐Al2O3 particle. The electrical property test demonstrated that the composite films performed improving electrical breakdown strength and corona resistance. The microstructure changes of pure film and PI/Al2O3 nanocomposite films during corona aging have been analyzed by SEM. POLYM. COMPOS., 37:763–770, 2016. © 2014 Society of Plastics Engineers
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