The Mechanism of Polybenzimidazole Formation by Condensation of Aromatic Tetramines and Esters and the Structure of the Resulting Polycondensates
作者:
D.N. Gray,
GarsonP. Shulman,
R.T. Conley,
期刊:
Journal of Macromolecular Science: Part A - Chemistry
(Taylor Available online 1967)
卷期:
Volume 1,
issue 3
页码: 395-411
ISSN:0022-233X
年代: 1967
DOI:10.1080/10601326708053979
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The vacuum or inert-atmosphere condensation of diphenyl isophthalate and 2,2′,3,3′-tetraaminobiphenyl to poly-2,2′-(m-phenylene)-5,5′-bibenzimidazole has been investigated. Evidence from polymer and model compound (diphenylbibenzimidazole) spectral studies, elemental analysis, and analysis of volatile effluent indicates that the prepolymer formed at 260 to 300°C contains both benzimidazole and hydroxybenzimidazoline but is essentially free from phenoxybenzimidazole structures. A mechanism involving loss of phenol initially, followed by evolution of water to give benzimidazole structures, is established from experimental evidence. Polymerization in vacuum to 400°C gives the polybenzimidazole.
点击下载:
PDF (785KB)
返 回