Unified wear model for highly crosslinked ultra-high molecular weight polyethylenes (UHMWPE).

摘要: Crosslinking has been shown to improve the wear resistance of ultra-high molecular weight polyethylene in both vitro and clinical vivo studies. The mechanisms material properties that are responsible for this marked improvement still not well understood. In fact, following crosslinking a number mechanical UHMWPE decreased including toughness, modulus, ultimate tensile strength, yield hardness. general, these changes would be expected constitute precursor lower resistance, presenting paradox increases with crosslinking. order understand better analyze paradoxical behaviour crosslinked UHMWPE, we investigated behavior (i) radiation-crosslinked GUR 1050 resin, (ii) peroxide-crosslinked resin (iii) Himont 1900 using bi-directional pin-on-disk (POD) machine. Wear was analyzed as function crystallinity, strength (UTS), (YS), between crosslinks (Mc). crosslink density increased increasing radiation dose level initial peroxide content. UTS, YS, crystallinity density. While variations followed same trend, absolute were different three types studied. There no unified correlation UTS YS. However, POD rate showed identical linear dependence on Mc all UHMWPEs Therefore, have strong evidence propose or is fundamental property governs lubricated adhesive abrasive UHMWPEs, overriding possible effects other such YS behavior.