中文摘要：

为了增强超高分子量聚乙烯（UHMWPE）的性能,研究采用表面改性的Ti_3AlC_2填充UHMWPE,通过热压成型制备了Ti_3AlC_2/UHMWPE复合材料。采用SEM观察复合材料的微观结构,表明Ti_3AlC_2均匀分散在UHMWPE基体中,表面处理后的填料与基体界面熔合较好;热分析结果表明,Ti_3AlC_2的添加降低了UHMWPE的结晶度和结晶热焓,同时提高了聚合物的热传导性;DMA分析结果表明,添加Ti_3AlC_2有效地提高了Ti_3AlC_2/UHMWPE复合材料的抗蠕变性能,得益于无机粒子改善了复合材料的硬度和刚性,提高了复合材料抗外界应力变形能力;摩擦学性能分析表明,适量的Ti_3AlC_2（质量分数≤15wt%）填充UHMWPE能有效提高复合材料的减磨抗摩性能,同时磨痕表面形貌分析结果表明,Ti_3AlC_2/UHMWPE复合材料的摩擦磨损机制由粘着磨损向磨粒磨损转变。

英文摘要：

In order to improve the performances of ultrahigh molecular weight polyethylene （UHMWPE） , surface modification of Ti3 AlC2 filled UHMWPE was studied. Ti3 AlC2/UHMWPE composites were prepared by hot-press moulding technique. SEM results show that Tia A1C2 distributes homogeneously in the matrix and the modified fillers have a better boundary integrate with the polymer matrix. Thermal analysis results show that the crystallinity and enthalpy of Ti3, AlC2/UHMWPE composite decreases with the addition of Ti3 AlC2, while the thermal conduc- tivity of the composites increases. DMA results show that Ti3 AlC2 improves the creep performence of Tia AlC2/ UHMWPE composites effectively, which is benefited from the increase of hardness and rigidity of the polymer matrix and the capability of resistance to deform under external stress is enhanced. Additionally, tribology analysis shows that the right amount of Ti3 AlC2 （mass fraction≤15wt%） filled UHMWPE can improve the anti-friction performance of the composites effectively, while the worn surface morphology analysis of Ti3 AlC2/UHMWPE composites shows that the friction and wear mechanism of the composite transform from adhesive wear to abrasive wear.