Effect of europium(II) stearate on the mechanical properties and the oxidation resistance of UHMWPE
Effect of europium(II) stearate on the mechanical properties and the oxidation resistance of UHMWPE
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DOI：
10.1016/j.jmbbm.2010.11.009
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发表时间：
2011-07-01
影响因子：
3.9
通讯作者：
Laurent, Michel P.
中科院分区：
文献类型：
--
作者：
Gallardo, Luis A.;Knowlton, Christopher B.;Laurent, Michel P.
本初步研究的目的是研究硬脂酸铕（II）添加剂对超高分子量聚乙烯（UHMWPE）的机械性能和抗氧化性的影响，该超高分子量聚乙烯已被用作假体器械的关节面多年。本研究假设，将超高分子量聚乙烯与镧系元素硬脂酸盐结合可以增强抗氧化性，从而更好地保持材料的机械完整性。压缩成型的超高分子量聚乙烯掺杂有0、375和750 ppm的硬脂酸铕（II），在氮气气氛中进行35 kGy的伽马辐照，并根据ASTM标准F2003-02进行加速老化。未辐照和未老化的样品用作对照。使用小冲杆试验对微型样品的机械性能进行了比较测试。氧化指数（OI）是通过所有辐照样品的薄膜切片上的FTIR光谱获得的。掺杂硬脂酸铕（II）的UHMWPE具有与常规UHMWPE对照相同的小冲杆测试曲线形状;最终位移保持不变（约4.33 +/- 0.02 mm），而极限载荷和失效功仅表现出小的变化（分别< 7.5%和<5.0%）。掺杂材料比对照材料更耐氧化，在辐照和加速老化后保留其辐照工作失效的83%，而对照材料仅为53%。加速老化将对照组的平均氧化指数从0.07变为0.40;而对于375 ppm和750 ppm掺杂条件，平均氧化指数分别从0.03变为0.15和从0.05变为0.13。(C)2010爱思唯尔有限公司版权所有。
The objective of this pilot study is to investigate the effect of europium(II) stearate additive on the mechanical properties and oxidation resistance of an ultra-high molecular weight polyethylene (UHMWPE), which has been used as an articulating surface in prosthetic devices for many years. It is hypothesized in this study that combining the UHMWPE with lanthanide stearates could enhance oxidation resistance, leading to better preservation of the material's mechanical integrity.Compression molded UHMWPE was doped at 0, 375 and 750 ppm of europium(II) stearate, gamma-irradiated to 35 kGy in a nitrogen atmosphere, and accelerated aged in accordance with the ASTM standard F2003-02. Non-irradiated and nonaged samples were used as controls. Miniature samples were comparatively tested for mechanical properties using the small punch test. Oxidation indices (OIs) were obtained through the FTIR spectroscopy on thin film sections of all irradiated samples.The UHMWPE doped with the europium(II) stearate had the same small punch test curve shape as the conventional UHMWPE control; the ultimate displacement remained unchanged (approximately 4.33 +/- 0.02 mm), while the ultimate load and work-to-failure exhibited only small changes (< 7.5% and < 5.0%, respectively). The doped material was more resistant to oxidation than the control material, retaining 83% of its as-irradiated work-to-failure after irradiation and accelerated aging, versus only 53% for the control. Accelerated aging changed the average oxidation index of the control group from 0.07 to 0.40; whereas the average oxidation indices changed from 0.03 to 0.15 and from 0.05 to 0.13 for the 375 ppm and the 750 ppm doped condition, respectively. (C) 2010 Elsevier Ltd. All rights reserved.