| abstract |
The invention provides preparation methods of a carbon fiber/graphene/epoxy resin prepreg and a carbon fiber composite material and belongs to the field of preparation of carbon fiber composite materials. By carrying out surface modification on graphene prepared by adopting an improved Hummers method and grafting -NH2 on the surface or the edge of the graphene, the dispersity of the graphene in a resin substrate is improved; and meanwhile, the interface bonding force between a micron-grade carbon fiber and an epoxy resin substrate can be effectively increased and gap defects are reduced, so that the mechanical properties of an epoxy resin based composite material are improved. When the adding amount of the carbon fiber/graphene/epoxy resin prepreg and carbon fiber composite material provided by the invention is 0.5wt%, the mechanical properties are optimal; the bending strength reaches 1525.4MPa and the interlayer shearing strength reaches 91.14MPa; and compared with a carbon fiber enhanced epoxy resin composite material, the bending strength and the interlayer shearing strength are improved by 15.41% and 14.14% respectively. The preparation method has the characteristics of simple process, small solvent toxin, applicability of industrial production and the like. |