Physicochemical Characteristics and Basic Properties of the Fluorinated BOPP Surface Layer and its Effect on Dielectric Strength

In order to promote the possible application of direct fluorination for the performance improvement of capacitor dielectric film, the commercial BOPP film was fluorinated. Surface physicochemical characteristics and basic properties of the fluorinated PP film were investigated. ATR-IR analysis shows an obvious difference in surface chemistry, and SEM observation gives direct information on the thickness and morphology of the fluorinated surface layer. Contact angle measurements and surface energy calculation show changes in wettability and surface energy by the fluorination, and surface potential measurements indicate that the fluorination led to an increase in surface conduction of the PP film. Further, DC breakdown strength measurements reveal a significant increase (by 23.4%) in DC breakdown field strength of the PP film by the fluorination.