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A diacid monomer of benzobisoxazole 2, 6-di(p-phenylene-carboxylic) acid (BBODPA) was synthesized in a simple procedure, and characterized by means of FTIR, 1 H NMR and 13 C NMR. The resulting BBODPA was polymerized with 3, 3'-diaminobenzidine tetrahydrochloride (DAB) to prepare poly (bibenzimidazolep-phenyl-benzobisoxazole) (PBBIBBO) in polyphosphoric acid. The inherent viscosities values of PBBIBBO indicated that it was a kind of high molecular weight polymer. The structure of PBBIBBO wasdoi:10.4067/s0717-97072009000400001 fatcat:xleycemaanb7xbggsxqzqsamay