Modified novolac resins with benzoxazine rings were prepared. The synthetic method involved the preparation of 1,3,5‐triphenylhexahydro‐1,3,5‐triazine as an intermediate that further reacts with the novolac resin. The catalytic effects of phenols, carboxylic acids, and Lewis acids on the benzoxazine ring‐opening polymerization were shown. The curing behavior of the benzoxazine compounds and the thermal properties of the cured resin were studied, and the results indicated improved degradation behavior for flammability. V‐0 materials were obtained when the materials were tested for ignition resistance using the UL‐94 test.
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Espinosa et al. (2003) studied this question.
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