表面硅烷交联改性超高分子量聚乙烯材料在干摩擦条件下的摩擦磨损性能研究

Sliding wear of surface modified ultrahigh molecular weight polyethylene by silane crosslinking

为进一步提高超高分子量聚乙烯(UHMWPE)的耐磨损性能,制备了表面硅烷交联改性UHMWPE材料。本文对这种表面改性UHMWPE材料在干摩擦条件下的摩擦磨损性能进行了初步研究。结果表明,其摩擦系数、磨痕宽度与未经改性的UHMWPE相比均有一定程度的降低,磨屑数量也减少,耐磨损性能明显提高。其原因归结于经硅烷交联改性后,UHMWPE材料表面硬度提高,润滑状况改善,使材料抗磨粒磨损和抗粘着磨损能力提高,从而导致其耐磨损性能明显提高。

The wear and friction behavior of the surface modified ultrahigh molecular weight polyethylene ( UHMWPE ) by silane crosslinking was studied through a ring-on-block wear tester. The results showed that both the friction coefficient and the wear scar of the modified UHMWPE decreased apparently compared with those of unmodified UHMWPE. The amount of wear debris on the worn surface of the modified UHMWPE also reduced. It could be ascribed to the crosslinking by the silane reagent and the lubricate-d moieties incorporated with silane hydrolysis,which enhanced the hardness and improved the lubrication of the material. The ability to resist to abrasive wear and adhesive wear was so enhanced for the surface modified UHMWPE.