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The field dependent conduction current of nano-Al2O3 and nano-SiO2 composite polyimide films, with Al2O3 content of 5%, 10% 12.5%, 15% and 20% and SiO2 content of 5%, 15% and 30% in weight ratio, were measured, respectively. The conduction current of 10% Al2O3 content film after corona aging was also measured. The results show that, with increasing the inorganic content, the conduction current of...
Morphology changes of both corona-aged original and nano-inorganic hybrid polyimide film were characterized by SEM. 4 kV power frequency voltage and 4 kV, 5 kHz square pulse voltage were applied to the specimen respectively. It was found that the honeycomb structure appeared on the aged surface of original film, and crack and some inorganic like substance exhibit on the aged surface of the nano-inorganic...
The dielectric characteristics of nano-Al2O3 composite polyimide film with Al2O3 content of 5%, 10%, 12.5%, 15% and 20% in weight ratio were measured, respectively. The permittivity, dissipation factor and TSC peak temperature increase with increasing of the inorganic content. A percolation threshold corresponding to the content between 12.5% and 15% was discovered. With increasing the Al2O3 content,...
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