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spaopldsNew high temperature aromatic polybenzoxazinones of high molecular weight have been prepared by the cyclopolycondensation of 4,4'diamhobiphenyl-3,3'dicarboxylic acid (I) with aromatic dicarboxylic acid halides (11). Thelow temperature solution polymerization techniques afforded poly(amic acid) (111) of high molecular weight in the first step. An open-chain precursor subsequently underwent thermal cyclodehydration along the polymer chain at 2W35OoC. in the second step, to give in quantitative yield a fully aromatic polybenzoxazinone (IV) of outstanding heat stability both in nitrogen and in air. The poly(amic acid) is soluble in N-methyl-Zpyrrolidone, and tough, transparent films can be csst from solution. Insoluble aromatic polybenzoxazinone f i l m s which possess excellent oxidative and thermal stability were obtained by the heat treatment of the polyamic acid. A detailed accouht of polymerization conditions in the low temper* ture solution polymerization of polybenzoxazinones is given, and the reaction mechanisms of cyclopolycondensation of poly(amic acids) and the formation of polybenzoxazinones are discussed. cyclopolycondensation of poly (amic acids) and the formation of polybenzoxazinone are discussed.

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