采用一种大分子接枝偶联剂对 F- 1 2纤维表面进行等离子体接枝改性 ,并采用 ESCA对改性后的纤维表面进行分析 ,研究了接枝偶联剂的分子量和浓度对 F- 1 2 /环氧复合材料横向拉伸强度的影响 ,并结合横向拉伸的断口对改性机理进行了分析。实验结果表明 :接枝偶联剂接枝改性以后 ,能够有效地改善 F- 1 2 /环氧复合材料的界面结合状态 ,从而提高复合材料的横向拉伸强度。 A macromolecule grafting coupling agent was used to modify the surface of F-1 2 fiber by plasma grafting. The surface of modified fiber was analyzed by ESCA. The molecular weight and concentration of graft coupling agent F-1 2 / epoxy composite transverse tensile strength, combined with the transverse tensile fracture analysis of the modification mechanism. The experimental results show that the grafting coupling agent can improve the interfacial bonding state of F-1 2 / epoxy composites effectively and improve the transverse tensile strength of the composites.