Photodegradation of Polyimides 2. Thermal Property Changes of Polyimides Based on a Perfluorinated Dianhydride

摘要

Polyimides based on a perfluorinated dianhydride decrease in thermal and thermal oxidative stability upon photolysis with an unfiltered medium pressure mercury lamp source. Additionally, the glass transition of photolyzed of polyimides containing the perfluorinated moiety is lowered with increasing photolysis time. By contrast, pyromellitic dianhydride polymers are relatively thermally stable even after prolonged photolysis under similar conditions. Imides; Polymers. (MJM)