The Electric Characteristic Research Of Inorganic Hybrid Polyimide Film

In order to research the effect of inorganic hybrid on the electric characteristic of polyimide film, the dielectric spectrum, direct current volume resistivity and conduction current of Dupont original and corona-resistant polyimide films (100HN and 100CR) were measured. The corona aging experiment was built up and both of the 100HN film and the 100CR film were aged. The surface morphological changes of them after corona aging were observed by scanning electric microscope. The electric parameters before and after corona aging were compared and analyzed. In addition, the Al2O3 hybrid polyimide films with the content of 5%, 10%, 12.5%, 15% and 20% in weight ratio were prepared by sol-gel reaction, and then their electric parameters were measured.By measuring the electric parameters of 100HN film and 100CR film, the results are below. (1) In the frequency range 102Hz~105Hz and temperature range 30?C~150?C, the permittivity decreases with the increasing of frequency and temperature, and the dissipation factor increases with the increasing of frequency, but decreases at first and then increases with the increasing of temperature. The permittivity and dissipation factor of 100CR film are lager than that of 100HN film. (2) The direct current volume resistivity of 100HN film and 100CR film are 1.9×1017??cm and 2.05×1016??cm. (3) With the increasing of temperature, the conduction current increases, and the electric degradation threshold of 100HN film increases, while the electric degradation threshold of 100CR decreases. The conduction current of 100CR film is much larger than that of the 100HN film. From calculation, the trap capture level of 100HN film and 100CR film are 0.9eV and 0.7eV.After corona aging, the permittivity and dissipation factor of 100HN film and 100CR film increases appreciably, and the electric degradation threshold...