EFFECT OF HUMIDITY ON THE BREAKDOWN STRENGTH AND DIFFUSION CHARACTERISTICS OF POLYMER FILM

Dielectric breakdown strength and diffusion characteristics were measu red for polyimide and polyimide fluorocarbon polymer film at different weathering conditions. The dielectric breakdown strength and the diff usion coefficient were found to decrease in humid conditions. Differen t diffusion characteristics as well as breakdown mechanisms were obser ved on both sides in the PMF-1 polymer film. The permeation coefficien t and diffusion coefficient decrease, thereby increasing the breakdown strength in more humid conditions that may be due to the formation of double potential well in the polymer film.