Wear Evaluation of Poly(vinyl alcohol) Hydrogel by UV Spectrometry and Total Organic Carbon Measurement of Lubricant
Wear Evaluation of Poly(vinyl alcohol) Hydrogel by UV Spectrometry and Total Organic Carbon Measurement of Lubricant
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DOI：
10.1007/s11249-022-01672-6
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发表时间：
2022-11
影响因子：
3.2
通讯作者：
H. Takefuji;Hiroki Iwama;M. Annaka;Shintaro Yashima
中科院分区：
文献类型：
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作者：
H. Takefuji;Hiroki Iwama;M. Annaka;Shintaro Yashima
我们报告的聚（乙烯醇）（PVA）水凝胶的磨损评价通过测量聚合物浓度的润滑剂后的滑动试验。水凝胶有望成为成功的生物材料，其应用需要进行磨损评价。然而，水凝胶的溶胀和干燥行为使得难以通过将相同的方法应用于固体材料来进行准确的磨损评估。在这项工作中，进行了滑动试验，然后磨损的凝胶样品的显微镜观察和定量磨损评价使用的润滑剂。为了了解磨损和表面几何形状之间的关系，使用具有各种表面粗糙度的玻璃基板和具有不同表面几何形状的水凝胶。润滑剂的UV光谱和总有机碳测量显示，磨损量随着滑动时间或基底的表面粗糙度而增加，并且可以定量地评估PVA凝胶的磨损。水凝胶上的表面凹坑的效果是不同的，这取决于反物质;摩擦和磨损降低对玻璃，但低摩擦和高磨损出现对凝胶。由于微坑凝胶表面的磨痕较少，说明微坑对产生的磨粒起到了刮擦和截留作用，减少了磨粒的转移和表面损伤。通过测量润滑剂中PVA的浓度，可以分别定量地评估凝胶的磨损是由于表面变形和转移，还是由于表面损伤造成的损失。图形摘要
We report the wear evaluation of poly(vinyl alcohol) (PVA) hydrogel by measuring the polymer concentration in the lubricant after the sliding test. Hydrogels are expected to become successful biomaterials, and wear evaluation is required for their application. However, the swelling and drying behavior of hydrogels makes accurate wear evaluation difficult by applying the same method for solid materials. In this work, sliding tests were conducted, then the microscopic observation of the worn gel sample and the quantitative wear evaluation using the lubricant were performed. To understand the relationship between wear and surface geometry, glass substrates with various surface roughness and hydrogels with different surface geometries were used. UV spectrometry and total organic carbon measurements of the lubricant revealed that the wear amount increases with sliding time or surface roughness of the substrate, and it is possible to quantitatively evaluate the wear of the PVA gel. The effect of surface dimples on the hydrogel was different depending on the counter substance; friction and wear decreased against the glass, but low friction and high wear appeared against the gel. Because there were a few wear scars on the gel with dimples, it was suggested that dimples scrape and trap the generated wear particles, reducing the transfer of wear particles and surface damage. Measuring the concentration of PVA in the lubricant made it possible to separately and quantitatively evaluate whether the wear of the gel was due to surface deformation and transfer, or loss due to surface damage.Graphical Abstract