Nonstoichiomeric polymerization of polyimide by using reaction-induced crystallization of oligomers

Kanji Wakabayashi, Takuya Ito, Shinichi Yamazaki, Kunio Kimura

Research output: Contribution to conferencePaperpeer-review


Nonstoichiometric preparation of poly(4,4'-oxydiphenylene pyromelliteimide)(Kapton) from pyromellitic dianhydride (PMDA) and 4,4'-oxydianiline (ODA) was examined by using reaction-induced crystallization of oligomers. When the polymerization was carried out under stoichiometric condition, the crystals having ηinh of 1.58 dL/g were obtained. Under the excess ODA, ηinh was insensitive toward the imbalance of stoichiometry, and suprisingly, ηinh became 1.63 dL/g even under 50 mol% excess. In the polymerization under nontoichiometric condition, the terminated oligomers precipitated to form the crystals and the solid-state polymerization proceeded with the elimination of terminated oligomer unit in oligomer crystals resulting in high molecular weight.

Original languageEnglish
Number of pages1
Publication statusPublished - 2006
Event55th SPSJ Annual Meeting - Nagoya, Japan
Duration: May 24 2006May 26 2006


Other55th SPSJ Annual Meeting


  • Crystallization of oligomers
  • Nonstoichiometric polymerization
  • Polyimide

ASJC Scopus subject areas

  • General Engineering


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