Abstract
Thermostable polyureas which possess a benzimidazole ring in the main chain have been prepared by the solid-phase polycondensation of the coprecipitate of bisphenylurethane, 2, 2′-di-p-N-phenoxycarbonylaminophenyl-5, 5′-bibenzimidazole, and diamines. The solid-phase reaction, the decomposition of phenylurethane followed by the reaction with diamine, was investigated by DTA, TGA and DSC. The polymerization proceeded in two stages and the activation energy of the latter stage was much larger than the former. The rate-determining factor was concluded to be the diffusition of each reactant in the latter part of the reaction. The dissociation of phenylurethane was activated by amine also in the solid-phase reaction and the activation energy was in good agreement with those obtained in amine solutions.
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Uno, K., Niume, K., Nakayama, T. et al. Solid-Phase Polycondensation of Aromatic Bisphenylurethane and Aromatic Diamine. Polym J 6, 348–355 (1974). https://doi.org/10.1295/polymj.6.348
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DOI: https://doi.org/10.1295/polymj.6.348