Influence of Composition on the Properties of BMI Neat Resins and BMI/T300 Composites

A typical bismaleimide (BMI) two-component system based on 4,4′-bismaleimidodiphenyl methane (MBMI)/O.O′-diallylbisphenol A (DABPA) was modified with bismaleimidodiphenyl ether of bisphenyl A (MEBMI), allyl-phenolic epoxy (AE) and thermoplastic modified polyetherketone(PEK-C). The influence of various modifying components on the properties of BMI neat resin and BMI/T300 composites were investigated. Results indicate that two BMI neat resin systems modified with AE and PEK-C and MEBMI, AE and PEK-C had outstanding impact strength (>18KJ/m²) and excellent heat resistance. BMI/T300 composites corresponding to the above modified BMI neat resin systems showed excellent toughness (CAI > 210MPa), outstanding mechanical properties, good processability and relatively high glass transition temperature (Tg). These novel toughened BMI resin systems are expected to find use in advanced composite materials.