The characteristics of permittivity and dissipation factor and conduction current of nano Al2O3-polyimide composite film and nano SiO2-polyimide composite film were measured.Experiment results showed that the permittivity and dissipation factor of the two kinds of composite films increase and the electrical ageing threshold decrease with increasing of nano inorganic content
the permittivity and dissipation factor of nano Al2O3-polyimide composite film are larger than that of nano SiO2-polyimide composite fi...