AbstractBarbituric acid (BTA) has a novel influence on glass transition temperature (Tg) of bismaleimide (BMI)–epoxy resin systems. It causes theTgof a BMI–epoxy resin system to rise significantly. The BTA's influence onTgwas investigated by changing the molar ratio of the reactants. In addition, the influence of benzoperoxide (BPO) onTgwas compared with that of BTA. The reaction selectivity of BTA and diamino‐diphenyl sulfone (DDS) toward BMI and epoxy individually in the BMI–epoxy blended systems were studied using the DSC and GPC. By controlling the amount of DDS and BTA, epoxy and BMI could form intercrosslinking n
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