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Inorganic nanohybrid polyimide(PI)is widely applied in electrical and electronic devices for its outstanding insulating properties.Samples 100CR and 100NH are made in Dupont.Among them,100NH is a kind of pure PI films; however,100CR is a kind of inorganic nanohybrid PI/films with excellent corona-resistance.The nanostructure of PI films is investigated with small-angle x-ray scattering technique and transmission electron microscopy(TEM).