中文摘要：

为增强超高分子量聚乙烯（UHMWPE）纤维与环氧树脂（EP）基体之间的界面粘结强度,采用重铬酸钾溶液对UHMWPE纤维进行表面改性并制备UHMWPE纤维/EP复合材料。结果表明,UHMWPE纤维经液相氧化后表面刻蚀痕迹明显,表面粗糙度明显增加,结晶度增加了11.3%,与乙二醇的接触角减小了14.12°。与纯环氧树脂相比,纤维含量为0.4%的未改性UHMWPE纤维/EP复合材料的拉伸强度降低18.04%,纤维含量为0.6%的液相氧化改性UHMWPE纤维/EP复合材料的拉伸强度降低51.55%,未改性UHMWPE（纤维含量0.5%）和液相氧化改性UHMWPE（纤维含量0.4%）纤维/EP复合材料的冲击强度分别提升了3.29%和4.39%。当纤维含量为0.3%时,液相氧化改性UHMWPE纤维/EP复合材料的弯曲强度比纯环氧树脂增加6.55%,比未改性UHMWPE纤维/EP复合材料增加19%。当纤维含量由0增大到0.5%时,改性和未改性UHMWPE纤维/EP复合材料的摩擦系数先增加后减小。

英文摘要：

The effects of chromic acid liquid-phase oxidation treatment on ultra-high molecular weight polyethylene（UHMWPE）fibers were investigated to improve the interfacial adhesion between UHMWPE fibers and epoxy resin（EP）.The UHMWPE fibers/EP composites were prepared with chromic acid-treated UHMWPE fibers.The results showed that the liquid-phase oxidation could effectively increase the fiber′s surface roughness,increase its crystallinity by 11.3%and reduce the contact angle with glycol by 14.12°.Compared with pure EP,the tensile strength of unmodified UHMWPE fibers/EP composite with a fiber content of 0.4wt% decreased by 18.04%,the tensile strength of liquid-phase oxidated UHMWPE fibers/EP composite with a fiber content of 0.6wt% decreased by51.55%,the impact strength of unmodified UHMWPE（0.5wt%fiber content）and liquid-phase oxidated UHMWPE（0.4wt%fiber content）fibers/EP composite increased by 3.29% and 4.39%,respectively.Compared with the pure EP and unmodified UHMWPE fibers/EP composite,the flexural strength of liquid-phase oxidated UHMWPE fibers/EP composite increased by 6.55% and 19% respectively when fiber content was 0.3wt%.The friction coefficients of the unmodified and liquid-phase oxidated UHMWPE fibers/EP composite increased first and then decreased when the fiber content rose from 0to 0.5wt%.