Preparation of brush-like crystals of poly[2,6-(1,4-phenylene)-benzobisimidazole]

Jin Gong, Shin ichiro Kohama, Kazuya Kimura, Shinichi Yamazaki, Kunio Kimura

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Poly[2,6-(1,4-phenylene)-benzobisimidazole] (PPBI) crystals were prepared by using reaction-induced crystallization of oligomers during solution polymerization of 1,2,4,5-tetraaminobenzene and diphenyl terephthalate. Polymerizations were carried out at a monomer concentration of 4.3 × 10-2 mol L-1 at 350 °C for 6 h. Brush-like PPBI crystals were obtained in a mixture of structural isomers of dibenzyltoluene, in which many needle-like crystals came out vertically from the surface of the ribbon-like crystals. Average width and thickness of the ribbon-like crystals were 0.75 μm and 0.11 μm, respectively. And average length and diameter of the needle-like crystals were 0.36 μm and 50 nm, respectively. The brush-like crystals possessed high crystallinity and exhibited good thermal resistance. The ribbon-like crystals were formed by the crystallization of imidazole oligomers at an initial stage of polymerization, and then the needle-like crystals grew from the surface of the ribbon-like crystals. Polymerization occurred on the crystals when the oligomers were crystallized, leading to the high molecular weight PPBI crystals.

Original languageEnglish
Pages (from-to)3928-3937
Number of pages10
JournalPolymer
Volume49
Issue number18
DOIs
Publication statusPublished - Aug 26 2008

Keywords

  • Brush-like crystals
  • Morphology
  • Polybenzimidazole

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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