Characterization of irradiated blends of α-tocopherol and UHMWPE
Characterization of irradiated blends of α-tocopherol and UHMWPE
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DOI：
10.1016/j.biomaterials.2005.04.026
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发表时间：
2005-11-01
期刊：
影响因子：
14
通讯作者：
Muratoglu, OK
中科院分区：
文献类型：
--
作者：
Oral, E;Greenbaum, ES;Muratoglu, OK
通过辐射交联，超高分子量聚乙烯 (UHMWPE) 的粘着/磨料磨损已降至最低。辐照后熔化，消除残余自由基，避免长期氧化脆化。然而，辐照后熔融会降低聚合物的结晶度，从而降低其强度和抗疲劳性。我们提出了一种辐射后熔化的替代方案，即在固结之前将抗氧化剂 α-生育酚掺入 UHMWPE 中。众所周知，α-生育酚会与氧气和氧化脂质发生反应，从而稳定它们，防止进一步的氧化降解反应。我们将 GUR 1050 UHMWPE 树脂粉末与 α-生育酚按 0.1 和 0.3wt% 混合。并巩固这些混合物。然后我们将这些混合物进行伽马射线照射至 100 kG。我们表征了α-生育酚对共混物的交联效率、氧化稳定性、磨损行为和机械性能的影响。 (1)原始交联密度。 0.1 和 0.3 wt% α-生育酚混合、100 kGy 辐照的 UHMWPE 分别为 175 +/- 19、146 +/- 4 和 93 +/- 4mol/m(3)。 (II) 预先与0、0.1和0.3wt％α-生育酚共混的100kGy辐照的UHMWPE在80℃空气中加速老化5周的最大氧化指数分别为3.32、0.09。和0.05，分别。 (III) 先前与 0.1 和 0.3wt% α-生育酚混合的 100 kGy 辐照 UHMWPE，在 80°C 空气中加速老化 5 周，销盘磨损率分别为 2.10 +/- 0.17 和 5.01 +/- 0.76 mg/百万次循环。 (IV) 与 100 kGy 辐照相比，两种加速老化、混合 α-生育酚的 100 kGy 辐照 UHMWPE 均表现出更高的极限拉伸强度、更高的屈服强度和更低的弹性模量。原始超高分子量聚乙烯。这些结果表明，α-生育酚混合的 100 kGy 辐照的 UHMWPE 的交联程度与 100 kGy 辐照的原始 UHMWPE 的交联程度不同。 (c) 2005 Elsevier Ltd. 保留所有权利。
Adhesive/abrasive wear in ultra-high molecular weight polyethylene (UHMWPE) has been minimized by radiation cross-linking. Irradiation is followed by melting to eliminate residual free radicals and avoid long-term oxidative embrittlement. However, Post-irradiation melting reduces the crystallinity of the polymer and hence its strength and fatigue resistance. We proposed an alternative to post-irradiation melting to be the incorporation of the antioxiclant alpha-tocoplicrol into UHMWPE prior to consolidation. alpha-Tocopherol is known to react with oxygen and oxidized lipids, stabilizing them against further oxidative degradation reactions. We blended GUR 1050 UHMWPE resin powder with alpha-tocopherol at 0.1 and 0.3wt%. and consolidated these blends. Then we gamma-irradiated these blends to 100-kG. We characterized the effect of alpha-tocopherol on the cross-linking efficiency, oxidative stability, wear behavior and mechanical properties of the blends. (1) The cross-link density of virgin. 0.1 and 0.3 wt% alpha-tocopherol blended, 100-kGy irradiated UHMWPEs were 175 +/- 19, 146 +/- 4 and 93 +/- 4mol/m(3), respectively. (II) Maximum oxidation indices For 100-kGy irradiated UHMWPE previously blended with 0, 0.1 and 0.3 wt% alpha-tocopherol that were subjected to accelerated aging at 80 C in air for 5 weeks were 3.32, 0.09. and 0.05, respectively. (III) The pin-on-disc wear rates of 100-kGy irradiated UHMWPE previously blended with 0.1 and 0.3wt% alpha-tocopherol that were subjected to accelerated aging at 80 C in air for 5 weeks were 2.10 +/- 0.17 and 5.01 +/- 0.76mg/million cycles, respectively. (IV) Both accelerated aged, alpha-tocopherol-blended 100-kGy irradiated UHMWPEs showed higher ultimate tensile strength, higher yield strength, and lower elastic modulus when compared to 100-kGy irradiated. virgin UHMWPE. These results showed that alpha-tocopherol-blended 100-kGy irradiated UHMWPEs were not cross-linked to the same extent as the 100-kGy irradiated, virgin UHMWPE. (c) 2005 Elsevier Ltd. All rights reserved.