Preparation of Poly(p-phenylenepyromelliteimide) Microspheres with Rugged Surfaces Using Crystallization During Isothermal Polymerization
✍ Scribed by Kanji Wakabayashi; Tetsuya Uchida; Shinichi Yamazaki; Kunio Kimura
- Publisher
- John Wiley and Sons
- Year
- 2010
- Tongue
- English
- Weight
- 800 KB
- Volume
- 212
- Category
- Article
- ISSN
- 1022-1352
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✦ Synopsis
Abstract
Preparation of discrete PPPI microspheres was examined using the crystallization of oligomers during isothermal polymerization of PMDA and p‐phenylene diisocyanate, and that of pyromellitic dithioanhydride and PPDA in poor solvents. In contrast to PPPI microspheres with smooth surfaces that were previously prepared by phase‐separation during the polymerization of PPDA and PMDA, the microspheres obtained here consisted of flake‐like lamellae with rugged surfaces. The diameters of the microspheres ranged from 0.5 to 6.7 µm. They exhibited excellent thermal stability depending on the monomers. These results provide a new preparative procedure of the PPPI microsphere with a rugged surface. magnified image