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首页> 外文期刊>Acta biomaterialia >Polarized Raman analysis of the molecular rearrangement and residual strain on the surface of retrieved polyethylene tibial plates.
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Polarized Raman analysis of the molecular rearrangement and residual strain on the surface of retrieved polyethylene tibial plates.

机译：对回收的聚乙烯胫骨板表面上的分子重排和残余应变的极化拉曼分析。

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摘要

The response to applied strain of EtO-sterilized and gamma-irradiated polyethylene materials belonging to tibial inserts has been studied by polarized Raman spectroscopy. Initial calibrations on as-received samples from three different makers were employed to clarify the rearrangement of molecular chains under strain, expressed in terms of Euler angular displacements in space and orientation distribution functions. This body of information was then applied to a quantitative analysis of four tibial inserts (from the same three makers of the unused samples) retrieved after in vivo exposures ranging between 7 months and 5 years 8 months. The main results of the Raman analysis can be summarized as follows: (i) gamma-irradiated samples experienced lower texturing on the molecular scale compared to EtO-sterilized samples, likely due to a higher strain recovery capability; and (ii) independent of sterilization method, the amount of plastic strain was mainly developed early after in vivo implantation, whereby out-of-plane molecules rotated under load onto planes parallel to the sample surface until saturation of angular displacements was reached.
机译：已经通过偏振拉曼光谱研究了属于胫骨插入物的经EtO消毒和伽马射线辐照的聚乙烯材料对施加应变的响应。对来自三个不同制造商的样品进行了初始校准，以阐明应变下分子链的重排，以空间和取向分布函数中的欧拉角位移表示。然后，将这些信息应用于在7个月至5年8个月的体内暴露后检索到的四个胫骨插入物（来自未使用样品的相同三个制造商）的定量分析。拉曼分析的主要结果可归纳如下：（i）γ辐照的样品与EtO灭菌的样品相比，在分子尺度上具有较低的织构，这可能是由于其应变恢复能力更高; （ii）与灭菌方法无关，塑性应变的量主要是在体内植入后早期发展的，由此平面外分子在载荷作用下旋转到平行于样品表面的平面上，直到达到角位移饱和为止。

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