The Mechanism of Polybenzimidazole Formation by Condensation of Aromatic Tetramines and Esters and the Structure of the Resulting Polycondensates
The Mechanism of Polybenzimidazole Formation by Condensation of Aromatic Tetramines and Esters and the Structure of the Resulting Polycondensates
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芳香族四胺与酯缩合形成聚苯并咪唑的机理及所得缩聚物的结构
DOI：
10.1080/10601326708053979
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发表时间：
1967
期刊：
影响因子：
--
通讯作者：
R. Conley
中科院分区：
文献类型：
--
作者：
D. Gray;G. P. Shulman;R. Conley
本文研究了在真空或惰性气氛下，己二酸二苯酯与2，2 ′，3，3 ′-四氨基联苯的缩合反应，合成了聚2，2 ′-间苯撑-5，5 ′-联苯并咪唑。来自聚合物和模型化合物（二苯基二苯并咪唑）光谱研究、元素分析和挥发性流出物分析的证据表明，在260至300°C下形成的预聚物含有苯并咪唑和羟基苯并咪唑啉，但基本上不含苯氧基苯并咪唑结构。从实验证据中建立了一种机制，涉及损失的苯酚最初，然后由水的演变，得到苯并咪唑结构。在真空中聚合至400°C得到聚苯并咪唑。
Abstract 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.