The surface modification of polyacrylonitrile( PAN)-based carbon fiber was conducted by electron beam irradiation induced graft. The effects of monomer types on the graft yield and mechanical properties of fiber-reinforced epoxy resin composite were studied. The changes of the surface morphology and chemical structure of PAN-based carbon fiber and the interlaminar crack morphology of fiber-reinforced composite were analyzed before and after irradiation graft. The results showed that after electron beam irradiation induced graft modification, the surface roughness and active functional groups of PAN-based carbon fiber increased and the interfacial mechanical engagement between fibers and matrix enhanced and the carbon fiber/epoxy resin composite had relatively smooth interlaminar shear crack; ethylenediamine/distilled water solution system was an ideal solution for irradiation graft modification, with which carbon fiber acquired the graft yield of 6.66% on the surface and fiber-reinforced composite had the interlaminar shear strength with a growth of 45. 1% under 200 kGy electron beam irradiation.%采用电子束加速器辐射接枝方法对聚丙烯腈(PAN)基碳纤维进行表面改性,研究了接枝单体种类对接枝率及其环氧树脂基复合材料力学性能的影响,分析了辐射接枝前后PAN基碳纤维的表面形貌与化学结构以及其复合材料界面断口的形貌变化.结果表明:电子束辐射接枝改性的PAN基碳纤维表面粗糙度增加,表面活性官能用增多,与树脂的机械锲合作用增强,其树脂基复合材料断口表面较为平整；乙二胺/水溶液体系是辐射接校改性的理想溶液,在200 kGy的电子束辐射下,PAN基碳纤维表面的接枝率为6.66％,复合材料的层间剪切强度提高了45.1％.
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