Modification of Bismaleimide Resin and Its Composites by Using Functionalized Graphene Oxide

Maleic anhydride was used to functionalize the graphene oxide (GO). The prepared functionalized GO was used to modify the bismaleimide (BMI) resin and the carbon fiber/BMI composites. The structure and properties of the composites were characterized. The results indicate that the maleic anhydride molecules are successfully grafted onto the GO surfaces. Due to the introduction of functionalized GO, the tensile strength, elastic modulus, blending strength, impact strength and glass transition temperature of the BMI resin were substantially improved. The impact fracture morphologies show that brittle fracture is transformed into ductile fracture after modification; moreover, the interfacial adhesions of carbon fiber/BMI composites were also enhanced obviously. The ILSS of composites increased from 84.0MPa to 104.6MPa after modification.