The extreme chemical inertness of high-modulus carbon fiber (HMCF) makes its functionalization quite difficult. In this work, a new method was explored to grafted glycidyl methacrylate (GMA) onto the surface of HMCF combined acid activation with co-radiation grafting. Structural changes and surface morphologies were investigated in detail. GMA was successfully grafted on to HMCF after acid activation synergized with ionization radiation, and the grafting degree was calculated to be 22%. The O/C atom ratio, content of the oxygen-containing functional groups on the surface. After acid activation and grafting, the hydrophilicity is effectively improved, and it can be wetted by water with good dispersibility in water. The surface structure of the fiber became highly disordered after grafting GMA. Finally, the grafting mechanism was discussed. The carboxyl groups introduced by the acid activation should be responsible for the successful grafting of the HMCF. This work provides a new pathway to fulfill the modification of HMCF and will be beneficial for obtaining high performance HMCF composites.

高模量碳纤维 (HMCF) 的极端化学惰性使其功能化非常困难。在这项工作中，探索了一种将甲基丙烯酸缩水甘油酯 (GMA) 接枝到 HMCF 表面的新方法，即酸活化与共辐射接枝相结合。详细研究了结构变化和表面形态。酸活化与电离辐射协同后，GMA成功接枝到HMCF上，接枝度计算为22%。O/C原子比，表面含氧官能团的含量。经酸活化接枝后，亲水性得到有效提高，可被水润湿，在水中分散性好。接枝GMA后纤维的表面结构变得高度无序。最后讨论了接枝机理。酸活化引入的羧基应该是成功接枝 HMCF 的原因。该工作为HMCF的改性提供了一条新途径，有利于获得高性能的HMCF复合材料。