Aromatic polybenzimidazoles from diamide and diamines

4th School-Seminar of Young Russian Scientists "Problems of Sustainable Regional Development", dedicated to the 70th anniversary of Academician of the Russian Academy of Sciences Arnold Kirillovich Tulokhonov

自然科学（总论）

Ch Kholkhoev, B.^1 ; Burdukovskii, V.F.^1

Baikal Institute of Nature Management SB RAS, Ulan-Ude

670047, Russia^1

关键词: Degree of conversion;    Dehydrocyclization;    Diamides;    Optimal reaction condition;    Polyamidines;    Polymer concentrations;    Sodium hypochlorites;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/320/1/012045/pdf
DOI  :  10.1088/1755-1315/320/1/012045

学科分类：自然科学（综合）

来源: IOP

【 摘 要 】

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.