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采用4,4′-二氨基二苯甲烷(DDM)处理氧化石墨烯(GO),将处理后的氧化石墨烯(GO-DDM)与环氧树脂(EP)充分混合制备了改性氧化石墨烯/环氧树脂复合材料(GO-DDM/EP).通过红外光谱(FT-IR)、X射线衍射(XRD)和透射电子显微镜(TEM)等分析方法对GO-DDM进行表征,采用电子万能试验机和悬臂梁冲击试验机对制得的复合材料进行力学性能测试.结果表明:DDM成功地接枝在GO的表面,极大提高了GO在有机溶剂中的分散性,且GO不再分散在水中.当复合材料中的GO-DDM含量为0.9％时,其拉伸强度提升了64.9％,冲击强度提升了17.0％.“,”Graphene oxide was treated by 4,4-diaminodiphenyl methane. The treated graphene oxide was blended with epoxy resin to prepare GO-DDM/EP composites. The modified graphene oxide was characterized by fourier transform infrared spectroscopy(FT-IR),X-ray diffraction(XRD),transmission electron microscope(TEM)and other analysis methods. The electro-mechanical universal testing machine and the cantilever beam impact testing machine were used to test the composites. The result showed that DDM successfully grafted on the surface of GO and the dispersion of GO in organic solvents was greatly improved,but the modified GO could no more dispersed in the water. The tensile strength of composite increased by 64.9％and the impact strength increased by 17.0％ when the addition of GO-DDM was 0.9％.