Open AccessAromatic polybenzimidazoles from diamide and diamines
Author(s) -
Б. Ч. Холхоев,
В. Ф. Бурдуковский
Publication year - 2019
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/320/1/012045
Subject(s) - condensation polymer , chemistry , hydrogen peroxide , sodium hypochlorite , reagent , benzoic acid , polymer chemistry , polymer , intrinsic viscosity , sodium , hypochlorite , organic chemistry
Aromatic polybenzimidazoles were obtained by oxidative dehydrocyclization of polyamidines, which were originally synthesized through polycondensation of 4,4’-oxybis(benzoic acid) diamide and diamines in Eaton’s reagent. The transformation was performed in solution using hydrogen peroxide or sodium hypochlorite as oxidants. It was found that the degree of conversion was not noticeably influenced by the polymer concentration in solution and by its molecular weight, whereas the oxidant content exerted appreciable influence. Under the optimal reaction conditions degree of cyclization reaches 95%. The viscosity characteristics of polybenzimidazoles suggest that the transformation of polyamidines is not accompanied by a change in their molecular weights.