Surface and morphological characterization of polysiloxane-block-polyimides

✍ Scribed by Nobuyuki Furukawa; Yasuharu Yamada; Masaya Furukawa; Masatoshi Yuasa; Yoshiharu Kimura

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 468 KB
• Volume: 35
• Category: Article
• ISSN: 0887-624X
• DOI: 10.1002/(sici)1099-0518(199708)35:11<2239::aid-pola14>3.0.co;2-f

✦ Synopsis

Two series of polysiloxane-block-polyimides were synthesized by the method of solution imidization of the polyamic acids prepared from the dianhydride/ diamine combinations of 3,3,4,4-diphenylsulfonetetracarboxylic dianhydride (DSDA)/ 2,2-bis[4-(4-aminophenoxy)phenyl]propane (BAPP) (Series A) and 3,3,4,4-benzophenonetetracarboxylic dianhydride (BTDA)/bis[4-(3-aminophenoxy)phenyl]sulfone (BAPSM) (Series B) with three kinds of w-diamino-poly(dimethylsiloxane) with different number-average molecular weight added as a part of diamine. These polysiloxaneblock-polyimides, having various compositions and chain lengths of the polysiloxane segments, were subjected to solution casting to prepare their films, and their surface and interface properties were analyzed by contact angle, XPS, AFM, and SEM. It was found that the surface tension and surface topography were greatly influenced by the composition and molecular weight of the polysiloxane segments because of their surface enrichment, which was affected by the environment and substrate with which the copolyimides had contacted.