Effect of surface modification of Kevlar stitch threads on mechanical interfacial properties of carbon fiber/bismaleimide stitched composites
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摘要: 为了改善Kevlar缝线缝合复合材料的耐湿热性能, 采用化学接枝烯丙基的方法对Kevlar缝合线进行表面改性处理。通过力学测试、 扫描电子显微镜(SEM)、 光电子能谱分析(XPS)对表面改性的纤维进行表征。实验结果表明, 化学处理的Kevlar缝线表面变得粗糙, 缝线表面氧元素的含量提高23%, 在合适的处理条件下, 缝线的拉伸强度降低很小。同时通过测试干、 湿态下炭纤维/双马来酰亚胺树脂缝合复合材料层压板的层间剪切强度, 研究了化学表面处理的Kevlar缝线对缝合炭纤维/双马来酰亚胺树脂复合材料界面性能的影响。测试结果显示, 表面处理后Kevlar缝线缝合的复合材料的吸湿率降低约52%, 湿态层间剪切强度保持率提高15%。Abstract: To improve the properties of durability towards combined moisture and temperature attack of stitched composites with Kevlar thread, the surface of Kevlar stitch thread was modified using the metalation and grafting Allyl group. The modified thread was characterized with tensile measurement, SEM and XPS. The results show that the surface of the chemical treated Kevlar stitch thread is rougher than that of the untreated thread. The oxygen content increases by 23% and the tensile strength decreases little under the proper condition. The interfacial properties of the stitched carbon fibre reinforced bismaleimide (BMI) resin composites T300 /QY9512 with Kevlar stitched threads were studied by interlaminar shear strength (ILSS). The result shows that the moisture uptake of carbon fibre/stitched BMI composites with chemical treated Kevlar threads decreases by 52% and the residue ratio of ILSS in the wet state improves by 15%.
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