Study on the Wettability and Tribological Behavior of Different Polymers as Bearing Materials for Cervical Prosthesis
Study on the Wettability and Tribological Behavior of Different Polymers as Bearing Materials for Cervical Prosthesis
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DOI：
10.1007/s11665-015-1529-7
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发表时间：
2015-04
影响因子：
2.3
通讯作者：
Song Wang;Jian Song;Z. Liao;Yuhong Liu;Caixia Zhang;Weiqiang Liu
中科院分区：
文献类型：
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作者：
Song Wang;Jian Song;Z. Liao;Yuhong Liu;Caixia Zhang;Weiqiang Liu
研究了四种聚合物（常规和交联UHMWPE，常规和玻璃纤维增强PEEK）与Ti6Al4V球铰接在干滑动和25%牛血清润滑条件下的摩擦学行为。测试了磨损痕的硬度、静态接触角、表面损伤形貌和磨损参数。超高分子量聚乙烯的交联处理和PEEK的玻璃纤维增强处理都改善了材料的润湿性，但没有提高材料的硬度。PEEK比UHMWPE具有更高的表面硬度和更好的润湿性。超高分子量聚乙烯的主要磨损机制是塑性变形和疲劳磨损，而PEEK的主要破坏机制是严重的粘着磨损和磨粒磨损。UHMWPE交联过程可形成多分子排列，减少分层现象，在干滑动和润滑条件下均可降低摩擦系数和磨损率。然而，玻璃纤维增强处理后的PEEK在干燥条件下仅降低了其摩擦系数和磨损率，这与玻璃纤维的功能和磨损机理密切相关。交联UHMWPE在润滑条件下的摩擦系数和磨损率最低，这与交联处理和蛋白质吸附膜和润滑膜的形成有关。因此，交联UHMWPE与Ti6Al4V接合后，可作为人工颈椎间盘承载材料的替代聚合物。
Tribological behaviors of four polymers (conventional and cross-linked UHMWPE, conventional and glass fiber-reinforced PEEK) articulated with Ti6Al4V ball were studied under both dry sliding and 25% bovine serum lubrication. The hardness, static contact angle, surface damage topography, and wear parameter of wear scar were tested. Both cross-linked process of UHMWPE and glass fiber-reinforced treatment of PEEK improved wettability while they did not increase hardness. PEEK revealed higher surface hardness and better wettability than UHMWPE. The dominant wear mechanisms for UHMWPE were plastic deformation and fatigue wear while the failure mechanisms were severe adhesive and abrasive wear for PEEK. Cross-linked process of UHMWPE could form multi-molecular arrangement and reduce stratification, also decreasing friction coefficient and wear rate in both dry sliding and lubrication conditions. However, glass fiber-reinforced treatment of PEEK only decreased its friction coefficient and wear rate in dry condition, which was closely related to the function and wear mechanism of glass fiber. Cross-linked UHMWPE revealed the lowest friction coefficient and wear rate under lubrication condition, which was attributed to the cross-linked treatment and the formation of both protein adsorption film and lubrication film. Hence, cross-linked UHMWPE may be an alternative polymer for use as artificial cervical disc bearing material when it articulated with Ti6Al4V.