为提高芳砜纶(PSA)纤维表面润湿性和基体界面黏结性能,用超声波在常温下对芳砜纶纤维进行表面改性.研究纤维改性前后润湿性能、界面剪切强度(IFSS)、断裂强度和摩擦性能的变化.用水滴吸收时间和单丝拔抽实验,分析改性前后PSA纤维表面润湿性能和界面剪切强度;并用场发射扫描电子显微镜(FESEM)和X射线光电子能谱仪(XPS)分析纤维表面的形貌和化学元素变化.结果表明,经超声波改性后,PSA纤维的润湿性能大幅提高,水滴吸收时间从大于400 s降至13s,且随处理时间增加润湿性能越好;PSA纤维与环氧树脂基体界面黏结性能大幅提高,较未经超声波处理纤维上升44％.同时,经超声波处理后,PSA纤维表面摩擦性能增强;表面氧、氮元素含量分别上升30.2％和18.3％,纤维表面极性基团增加.但是,处理时间过长会使纤维的断裂强度下降幅度加大,综合考虑实验的最佳处理时间为80 min.
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