Abstract
Previously, we prepared poly[2 (4' oxyphenylene) 5 benzimidazole] (POPBI) based on AB type mono mer [2]. These polymers attract interest due to the fact that they have more ordered structure and show good thermomechanical properties [3]. In continuation of these studies, in this work, we describe the synthesis of a new monomer, 4 (2' chloro 4',5' diaminophen oxy)benzoic acid (Scheme 1, compound 5), which was further used for the preparation of previously unknown poly(benzimidazole) under homopolycon densation conditions. According to preliminary computer simulations performed by A.A. Askadskii (Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences) with the use of Kaskad software, polymer based on acid 5 should show certain improved charac teristics as compared with POPBI: the better film forming ability. Other physicochemical characteristics should not degrade. The latter agrees well with litera ture data [4]. Furthermore, the presence of halogen atoms in poly(benzimidazole)s favors better binding of the polymer with the doping agent [5]. These advan tages should be favorable for the preparation of an effi cient polymer proton conducting membrane for fuel cells. The synthesis of the new monomer of AB type was conducted according to the procedure proposed for 4 (3',4' diaminophenoxy)benzoic acid [2]:
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