The poor interfacial adhesion of aramid fiber and matrix limits the application of the final composites. In this study, a series of the sulfone-functionalized poly(p-phenylene terephthalamide) (SPPTA) copolymers were satisfactorily synthesized and the effects of polymerization conditions (contents of the additional monomer and the cosolvent LiCl, molar concentration and ratio of the monomer, reaction temperature and time) on the molecular weight of the copolymer were discussed. The introduction of the sulfone group in aromatic polyamides not only increased the polarity of poly(p-phenylene terephthalamide) (PPTA) but destroyed the regular arrangement of the molecular chains, which greatly improved the surface free energy and the solubility of the polymers in organic solvents. The polymer maintained excellent thermal and interfacial properties. Compared with the PPTA fiber/epoxy composites, the interfacial shear strength (IFSS) of SPPTA fiber-reinforced epoxy composites reached 43.5 MPa, with a significantly enhancement of 20.8%, implying that the study provided an effective method to achieve highly interfacial adhesion of aramid fiber-reinforced composites.

芳族聚酰胺纤维和基体的不良界面粘合性限制了最终复合材料的应用。在这项研究中，令人满意地合成了一系列砜官能化的聚对苯二甲酰对苯二甲酰胺（SPPTA）共聚物，并考察了聚合条件的影响（附加单体和助溶剂LiCl的含量，摩尔浓度和单体比例， （反应温度和时间）对共聚物的分子量的影响。在芳族聚酰胺中引入砜基不仅增加了聚（p-亚苯基对苯二甲酰胺（PPTA），但破坏了分子链的规则排列，极大地提高了表面自由能和聚合物在有机溶剂中的溶解度。该聚合物保持了优异的热和界面性能。与PPTA纤维/环氧树脂复合材料相比，SPPTA纤维增强环氧树脂复合材料的界面剪切强度（IFSS）达到43.5 MPa，显着提高20.8％，这表明该研究提供了一种实现芳族聚酰胺高度界面粘合的有效方法纤维增强复合材料。