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首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >Raman spectroscopic study of remelting and annealing-induced effects on microstructure and compressive deformation behavior of highly crosslinked UHMWPE for total hip arthroplasty
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Raman spectroscopic study of remelting and annealing-induced effects on microstructure and compressive deformation behavior of highly crosslinked UHMWPE for total hip arthroplasty

机译：重熔和退火对高交联UHMWPE全髋关节置换术的微观结构和压缩变形行为的影响的拉曼光谱研究

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Three-dimensional crystallographic morphologies were studied by means of confocal/polarized Raman spectroscopy as developed upon manufacturing in three different types of first and second generation highly crosslinked UHMWPE (HXLPE) acetabular liners. The impact of such microstructural characteristics on the deformation behavior of the liners was also evaluated and discussed from the viewpoint of molecular chain mobility. All the investigated liners showed similar microstructural transitions within the first 35 mu pm below their surfaces in terms of crystallinity, molecular orientation, and crystalline anisotropy. Interestingly, different postirradiation heat treatments (remelting or annealing in single step or in sequential steps) led to clear differences in the subsurface microstructure among the three liners. Remelted liner possessed both lower bulk crystallinity and degree of molecular orientation as compared to the annealed liners. Sequentially, irradiated/annealed liner showed the highest degree of crystallinity and orientation among the studied liners. The peculiar microstructure of this latter liner exhibited the highest restoring (shape-recovery) force against the applied uniaxial strain. Accordingly, the present study suggests that the sequential irradiation and annealing offers an efficient way to obtain microstructure quite suitable for attaining high creep resistance. However, all the investigated liners exhibited the significantly low values of surface anisotropy, which could be equally efficient in minimizing strain-softening-assisted wear phenomena. (C) 2014 Wiley Periodicals, Inc.
机译：通过共焦/偏振拉曼光谱研究了三维晶体形态，该共焦/偏振拉曼光谱是在三种不同类型的第一代和第二代高交联UHMWPE（HXLPE）髋臼内衬生产时开发的。还从分子链迁移率的角度评估和讨论了这种微结构特征对衬里变形行为的影响。在结晶度，分子取向和结晶各向异性方面，所有研究的衬里在其表面以下的前35 pm pm内均表现出相似的微观结构转变。有趣的是，不同的辐照后热处理（单步或连续步骤中的重熔或退火）导致三个衬套之间的表面微观结构明显不同。与退火的衬里相比，重熔的衬里具有较低的整体结晶度和分子取向度。因此，在研究的衬里中，辐照/退火衬里显示出最高的结晶度和取向度。后一种衬里的特殊微观结构对所施加的单轴应变表现出最高的恢复力（形状恢复）。因此，本研究表明，顺序照射和退火提供了一种有效的方式来获得非常适合于获得高抗蠕变性的微观结构。但是，所有研究的衬里均表现出极低的表面各向异性值，在最小化应变软化辅助磨损现象方面同样有效。 （C）2014威利期刊公司

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