Specific of electret state of modified polyimide films

The aim of this work consists in pursuit of electret structure with excess humidity and high thermostability. The charge relaxation mechanism in polyimide and modified polyimide films is established. It is shown that the layers of polytetrafluoroethylene on surface of polyimide films lead to essential increasing of electret state stability at elevated temperature and high humidity. The currents of thermally stimulated depolarization were analyzed on the basis of developed physical model.