2008年8月
Preparation of brush-like crystals of poly[2,6-(1,4-phenylene)-benzobisimidazole]
POLYMER
- ,
- ,
- ,
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- 巻
- 49
- 号
- 18
- 開始ページ
- 3928
- 終了ページ
- 3937
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1016/j.polymer.2008.07.011
- 出版者・発行元
- ELSEVIER SCI LTD
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 x 10(-2) mol L-1 at 350 degrees 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 mu m and 0.11 mu m, respectively. And average length and diameter of the needle-like crystals were 0.36 mu m 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. (C) 2008 Elsevier Ltd. All rights reserved.
- リンク情報
- ID情報
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- DOI : 10.1016/j.polymer.2008.07.011
- ISSN : 0032-3861
- Web of Science ID : WOS:000259113900011