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首页> 外文期刊>Journal of orthopaedic research >Comparative oxidative stability of alpha-tocopherol blended and diffused UHMWPEs at 3 years of real-time aging.
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Comparative oxidative stability of alpha-tocopherol blended and diffused UHMWPEs at 3 years of real-time aging.

机译：实时老化3年后，α-生育酚混合和扩散的UHMWPE的比较氧化稳定性。

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摘要

Vitamin E (alpha-tocopherol) is a free-radical stabilizing antioxidant used to maintain oxidative stability in radiation cross-linked ultra-high molecular weight polyethylene (UHMWPE) used in total joint replacements. We investigated the oxidative resistance of vitamin E-stabilized UHMWPE in (i) postirradiation vitamin E-diffused UHMWPE, (ii) vitamin E blended and irradiated UHMWPE, and (iii) unstabilized, irradiated UHMWPE after accelerated aging and real-time aging in an aqueous environment at 40 degrees C for 36 months. Unstabilized samples exhibited substantial oxidation throughout the surface and bulk with both types of aging. While vitamin E-stabilized, radiation cross-linked UHMWPEs were all superior to unstabilized samples, irradiated blends showed surface oxidation and subsurface oxidation potential beginning at ten months in real-time aging. In contrast, postirradiation vitamin E-diffused UHMWPEs showed no detectable oxidation and no increase in oxidation potential despite elution of some vitamin E. We also showed that current thermal accelerated aging methods were unable to differentiate among the oxidative stability of vitamin E-stabilized, radiation cross-linked UHMWPEs prepared by different processes.
机译：维生素E（α-生育酚）是一种自由基稳定的抗氧化剂，用于在全关节置换中使用的辐射交联超高分子量聚乙烯（UHMWPE）中保持氧化稳定性。我们研究了维生素E稳定的UHMWPE在（i）辐照后的维生素E扩散的UHMWPE，（ii）维生素E混合和辐照的UHMWPE的氧化抗性以及（iii）加速老化和实时老化后的不稳定的，辐照的UHMWPE在40摄氏度的水环境中放置36个月。两种类型的老化，不稳定的样品在整个表面和整体上都表现出明显的氧化。尽管维生素E稳定的，辐射交联的UHMWPE均优于未稳定的样品，但在实时老化的10个月后，辐照的混合物显示出了表面氧化和亚表面氧化的潜力。相比之下，辐照后的维生素E扩散的UHMWPEs尽管洗脱了某些维生素E，但仍未检测到氧化，氧化电位也没有增加。我们还表明，当前的热加速老化方法无法区分维生素E稳定的，辐射的氧化稳定性。通过不同方法制备的交联超高分子量聚乙烯。

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