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。
The effects of chromic acid liquid-phase oxidation treatment on ultra-high molecular weight polyethy-lene (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 crys-tallinity by 1 1.3% 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 by 5 1.55%,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 1 9% 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 0 to 0.5wt%.
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