Effects of γ-ray irradiation on carbon fiber surface graft modification

γ-ray total irradiation inducing grafting was used to modify the carbon fiber surface to improve interfacial adhesion properties of the carbon fiber/epoxy composite.The change of surface chemical elements and functional groups composition, surface morphology, fracture surface and interlaminar shear strength(ILSS) of the carbon fiber/epoxy composite after 200 kGy doses of γ-ray radiation in different grafting solutions were studied severally with XPS,SEM,and electronic universal testing machine. The results show that condensed ethylene glycol graft solutions have ideal grafting effect, the carbon fiber grafting rate is 7%. the surface O/C ratio and the content of oxygen functional groups is increased. the ILSS of irradiated carbon fiber/epoxy composite also is increased, the maximum ILSS is increased by the rate of 31.2%. The surface roughness of carbon fiber is increased after irradiation.