【摘要】 对Kevlar纤维进行了改性,使其成为己内酰胺阴离子开环聚合的活性中心,采用阴离子接枝法在Kevlar纤维(KF)表面接枝尼龙6低聚物,并与基体尼龙6混合,用挤出和注塑方式制备了尼龙6/改性Kevlar纤维(PA6/KF1)复合材料。ESEM和XPS分析表明,Kevlar纤维表面接枝上了尼龙6低聚物。比较了尼龙6/未改性Kevlar纤维(PA6/KF0)和PA6/KF1复合材料的力学性能及破坏形态,同时探讨了其破坏机理。结果表明,接枝尼龙6的KF1增强了KF与尼龙6复合材料界面的相互作用,拉伸强度、弯曲强度和弯曲模量分别提高了20.69%、12.26%和14.23%,但冲击强度降低了8.2%;当复合材料被破坏时,未改性纤维表面只粘附有少量的树脂尼龙6,而改性纤维的表面有较多的树脂包覆层,呈部分非界面脱粘破坏,具有良好的界面结合能力。更多还原

【Abstract】 Kevlar fiber was modified by means of the anionic graft of nylon 6 oligomer.Nylon 6/modified Kevlar fiber(PA6/KF1) composites were prepared by extrusion and injection process.Both ESEM and XPS measurements proved that the nylon 6 oligomer was grafted onto the surface of Kevlar fiber.The mechanical properties,fracture morphologies and fracture mechanism of PA6/KF0 and PA6/KF1 composites were(compared) and studied.After being treated,the composites′ tensile strength,flexural strength and flexural(modulus) were increased by 20.69%,12.26% and 14.23% respectively,however,the impact strength(declined) by 8.2%.The adhesive nylon 6 on the PA6/KF1 composites was more than that on the PA6/KF0 composites when the composites were destroyed,and the failure morphology of PA6/KF1 composites was non-interfacial destruction.更多还原