通过添加超高分子量聚乙烯(UHMWPE)和聚乙烯接枝马来酸酐(PE-g-MAH)对混炼型聚氨酯弹性体(MPU)进行减摩改性, 研究了UHMWPE和相容剂PE-g-MAH加入量对共混体系摩擦因数、表面能和拉伸性能的影响, 通过扫描电子显微镜对共混体系的相容性进行了分析。结果表明: 随着UHMWPE加入量的增多, 共混体系的摩擦因数、表面能和断裂伸长率逐渐降低, 弹性模量则不断增大, 拉伸强度先增大后减小; 随着PE-g-MAH加入量的增多, 共混体系的摩擦因数不断降低, 而表面能先逐渐升高后趋于平缓, 拉伸强度、断裂伸长率先增大后减小, 弹性模量不断增大; 当共混体系配比为w(MPU)∶w(PE-g-MAH) ∶w(DCP) ∶w(UHMWPE)=100∶8∶0.05∶15时, 共混体系的改性效果最好, 摩擦因数达到最低且拉伸性能保持最佳。

Millable polyurethane rubber (MPU) was modified to reduce its friction coefficient by adding ultra-high molecular weight polyethylenes (UHMWPE) and maleic anhydride-grafted polythene (PE-g-MAH). The friction coefficient, surface energy and tensile properties of the blend were influenced by the adding amount of UHMWPE and PE-g-MAH. Compatibility of the blend was analyzed by SEM. The results show that with the increase of adding amount of UHMWPE, the friction coefficient, surface energy and break elongation of the blend reduced, but the elastic modulus increased, and the tensile strength increased at first and then decreased. With the increase of adding amount of PE-g-MAH, the friction coefficient of the blend reduced continuously, the surface energy, tensile strength and break elongation increased at first and then decreased, and the elastic modulus increased. The modified effect of the blend was best in the condition of w(MPU)∶w(PE-g-MAH)∶w(DCP)∶w(UHMWPE)=100∶8∶0.05∶15, and the blend prepared in this condition had the minimum friction coefficient and optimal tensile properties.