利用芳纶纤维对 Ｐ Ｐ Ｓ 复合材料进行增强改性。利用化学处理方法在纤维表面引入环氧基，以改善纤维与基体间的界面性能。结果表明：在相同纤维含量下，纤维长度增加可减少应力集中，有利于力学性能提高。纤维表面接枝环氧基团后，复合材料界面性能提高，水难以沿界面渗入，从而使得在同一条件下耐高温热水性能提高。 Modification of P P S Composites by Aramid Fiber. The use of chemical treatment methods to introduce epoxy groups in the fiber surface to improve the interfacial properties between fiber and matrix. The results show that under the same fiber content, the increase of fiber length can reduce the stress concentration and improve the mechanical properties. After grafting epoxy groups on the fiber surface, the interfacial properties of the composites are improved, and the infiltration of water into the interfacial interface is difficult, so that the performance of hot-water-resistant hot-water at the same conditions is improved.