Polybenzimidazoles, status report

Particular attention is given to polybenzimidazoles derived from the condensation of tetraaminobiphenyl and diphenylisophthalate. The polybenzimidazoles can be prepared by the condensation of equimolar amounts of the monomers in the absence of solvent. However, the polymerization has also been carried out in a variety of solvents. The polybenzimidazoles have excellent technical possibilities. These possibilities have currently not yet been commercially realized.