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本文引用的文献

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J Biomed Mater Res B Appl Biomater. 2009 Aug;90(2):720-9. doi: 10.1002/jbm.b.31340.
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Evaluation of oxidation and fatigue damage of retrieved crossfire polyethylene acetabular cups.翻修后的交联聚乙烯髋臼杯的氧化和疲劳损伤评估
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The effect of real-time aging on the oxidation and wear of highly cross-linked UHMWPE acetabular liners.实时老化对高度交联超高分子量聚乙烯髋臼衬垫氧化和磨损的影响。
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通过向六方相转变过程中的晶体迁移实现辐照超高分子量聚乙烯中的自由基消除

FREE RADICAL ELIMINATION IN IRRADIATED UHMWPE THROUGH CRYSTAL MOBILITY IN PHASE TRANSITION TO THE HEXAGONAL PHASE.

作者信息

Oral Ebru, Beckos Christine Godleski, Muratoglu Orhun K

机构信息

Massachusetts General Hospital, Department of Orthopaedic Surgery.

出版信息

Polymer (Guildf). 2008 Oct 6;49(21):4733-4739. doi: 10.1016/j.polymer.2008.07.049.

DOI:10.1016/j.polymer.2008.07.049
PMID:18985170
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC2577574/
Abstract

Ultra-high molecular weight polyethylene (UHMWPE) is radiation cross-linked to decrease wear in total joint applications. Irradiation decreases the strength of UHMWPE and introduces residual free radicals, which can cause oxidation in the long-term. We advanced a method eliminating the free radicals without a reduction in strength. UHMWPE exhibits a hexagonal phase at high pressure and temperature, where chain mobility in the crystalline phase is increased, leading to the formation of extended chain crystals. We hypothesized that the increased chain mobility during transformation from the orthorhombic to hexagonal phase could be used to eliminate the residual free radicals in irradiated UHMWPE. We eliminated the free radicals in 25-, 65- and 100-kGy irradiated UHMWPE and these materials did not show oxidation after accelerated aging. The ultimate tensile strength and work to failure of 25 and 65-kGy irradiated UHMWPEs were improved significantly while that of 100-kGy irradiated UHMWPE was lower compared to irradiated UHMWPE melted at ambient pressure.

摘要

超高分子量聚乙烯（UHMWPE）经过辐射交联以减少全关节应用中的磨损。辐照会降低UHMWPE的强度并引入残余自由基，长期来看这些自由基会导致氧化。我们提出了一种在不降低强度的情况下消除自由基的方法。UHMWPE在高压和高温下呈现六方相，此时结晶相中的链迁移率增加，导致形成伸展链晶体。我们推测，在从正交相转变为六方相的过程中增加的链迁移率可用于消除辐照UHMWPE中的残余自由基。我们消除了25、65和100千戈瑞辐照的UHMWPE中的自由基，这些材料在加速老化后未显示出氧化现象。与在常压下熔化的辐照UHMWPE相比，25和65千戈瑞辐照的UHMWPE的极限拉伸强度和断裂功显著提高，而100千戈瑞辐照的UHMWPE的则较低。