Abstract
Polymer reactions of polybenzoxazinones with organic bases such as ammonia and aniline were studied. From the ring-opening reaction of the benzoxazinone ring of polybenzoxozinone with an organic base, the corresponding polyamides having pendant amide groups were obtained quantitatively without the high decrease in molecular weight. The polyamide undergoes thermal cyclization along the polymer chain to again yield polybenzoxazinone by deamination reaction, whereas in the presence of lithium chloride or zinc chloride it yields fully aromatic polyquinazolone by thermal cyclodehydration. Polyquinazolone thus obtained has excellent thermal stability in nitrogen and in air.
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Kurihara, M., Hagiwara, Y. Cyclopolycondensation. XIII. Polymer Reactions of Polybenzoxazinones with Organic Base. Polym J 1, 425–431 (1970). https://doi.org/10.1295/polymj.1.425
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DOI: https://doi.org/10.1295/polymj.1.425