Abstract
Six polybenzimidazoles have been prepared by a dispersion polycondensation process using polyphosphoric acid as a dehydrating reagent. Two of these contained an additional pyridine residue in the mainchain, and three of them additional imidazole groups. The molecular structures have been characterized by u.v., i.r. and 1H n.m.r. spectra. Physical characterization has involved solubility measurements, solution viscosity evaluation and thermal stability assessment via thermogravimetric analysis. The latter has confirmed that the inherently high thermo-oxidative stability of polybenzimidazoles is retained in the case of polymers and copolymers with additional nitrogen heterocycles in the mainchain.
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