Abstract
Polybenzimidazoles containing p-carborane were obtained by a single stage method in melt formed of diphenyl ester of p-carborane dicarboxylic acid and aromatic tetramines and a two stage method from p-carborane dicarboxylic acid dichloride and aromatic tetramines in THF solution in the presence of trioctylamine with the separation of linear polyaminoamides and subsequent cyclodehydration to polybenzimidazoles. The properties of both polyaminoamides and polybenzimidazoles were examined and it was shown that these properties are not only influenced by the isomerism of the carborane nucleus, but also conditions of synthesis.
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