常温超声波处理对芳砜纶纤维界面性能的影响

Effect of ultrasonic treatment on interfacial properties of polysulfonamide fiber at room temperature

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400s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80min。

In order to improve the wettability and the interfacial bonding performance of the polysulfonamide(PSA)fiber,the surface of PSA fiber was modified by ultrasonic at room temperature.The wettability,interfacial shear strength(IFSS),breaking strength and friction performance of fiber before and after surface modification were analyzed.The water absorption and single fiber pull-out method were used to determine the wettability and the interfacial bonding performance of PSA fiber.The surface morphology and chemical composition of fiber were evaluated by field emission scanning electron microscopy(FESEM)and X-ray photoelectron spectrometer(XPS).The results showed that after ultrasonic treatment,the water absorption time drops from >400sto about 13 s,and the wettability of the PSA fiber increases sharply,and with the increase of processing time the wettability of PSA fiber was better.The interfacial bonding performance of PSA fiber to epoxy resin was greatly improved,and the IFSS value was increased by 44.0%.The friction performance was improved;the oxygen element and nitrogen element are increased by 30.2% and 18.3%,respectively;polar groups on PSA fiber surface are increased.However,the breaking strength of PSA fiber drops largely at a long-time ultrasonic treatment,and the optimum treatment time was 80 min.