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Preparation of Poly( p ‐phenylenepyromelliteimide) Microspheres with Rugged Surfaces Using Crystallization During Isothermal Polymerization
Author(s) -
Wakabayashi Kanji,
Uchida Tetsuya,
Yamazaki Shinichi,
Kimura Kunio
Publication year - 2011
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201000510
Subject(s) - polymerization , polymer chemistry , materials science , thermal stability , crystallization , monomer , pyromellitic dianhydride , isothermal process , chemical engineering , microsphere , polymer , composite material , polyimide , physics , layer (electronics) , engineering , thermodynamics
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.