Abstract
Properties of the cured bismaleimide (BMI) / o, o'-dially1 bisphenol A (CA) resin system were investigated from the viewpoints of bismaleimide skeleton structure and BMI /CA molar ratio.
The properties of cured BMI / CA resin ; glass transition temperature (Tg), specific gravity, flexural strength, flexural modulus and thermal degradation temperature increased as BMI/CA molar ratio increased. And water absorption did too. These results are mainly due to crosslinking density or maleimide content varying with BMI/CA ratio.
Crosslinking density also varies with bismaleimide skeleton structure. Therefore the properties of cured BMI/CA resin Properties ; glass transition temperature (Tg), flexural strength and modulus, water absorption etc. vary with it.
Generally, BMI with shorter skeleton length and symmetrical structure tended to have higher crosslinking density. The skeleton structure of BMI had little effect on thermal degradation temperature. But BMI/CA molar ratio did a significant effect on it.
