芳纶纤维因其光滑和惰性的表面导致其与树脂复合材料浸润性差，界面结合强度低，需要对芳纶纤维表面进行改性才能增强其与树脂之间的界面结合强度，进而充分发挥芳纶纤维的增强效果。本项目拟选用Kevlar纤维作为基材，利用电子束辐照技术在其表面接枝丙烯酰胺、丙烯酸等单体来增加纤维的表面浸润性，通过对接枝反应动力学的研究，不断优化实验参数，初步建立一个芳纶纤维连续电子束照接枝改性方法。同时，以改性Kevlar纤维作为增强体制备Kevlar/环氧树脂复合材料，通过对复合材料力学性能的研究，建立起浸润性变化及反应增容作用与复合材料力学性能之间的关系，为制备更高强度的芳纶/树脂复合材料积累经验。

Due to its smooth and inert surface, the wettability of aramid fibers is poor and interfacial bonding strength between aramid fibers and polymer matrices is relatively weak. To enhance the interfacial bonding strength between fibers and matrices and effectively utilize the excellent mechanical properties of fiber in composite materials, the surface of aramid fibers should be modified. In this project, Kevlar fibers are selected as the base material and will be modified to improve its surface wettability via grafting of vinyl monomers such as acrylamide and acrylic acid onto surface by EB radiation-induced grafting polymerization. Through the study of reaction kinetic and optimization of experiment parameters, a continuous EB radiation-induced grafting technique for modifying surface of aramid fiber will be preliminarily established. Meanwhile, the modified fiber will be further used as a reinforcement to prepare Kevlar/epoxy resin composites. The mechanical properties will be thoroughly evaluated to establish a relationship between modification of fibers surface and mechanical properties of composites, aiming to accumulate knowledge for preparation of high performance aramid fibers/resin composites.