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首页> 外文期刊>Wear: an International Journal on the Science and Technology of Friction, Lubrication and Wear >Experimental study on friction and wear properties of interpenetrating polymer network alginate-polyacrylamide hydrogels for use in minimally-invasive joint implants
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Experimental study on friction and wear properties of interpenetrating polymer network alginate-polyacrylamide hydrogels for use in minimally-invasive joint implants

机译：微创关节植入物中使用互穿聚合物网藻酸盐 - 聚丙烯酰胺水凝胶的摩擦磨损性能实验研究

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Alginate/Polyacrylamide (ALG/PAAm) hybrid hydrogel was suggested as an orthopedic prosthesis due to its biocompatibility and promising properties. Their friction and wear performances, however, have remained under-explored. In this study, indentation tests were conducted to obtain the mechanical properties of ALG/PAAm interpenetrating polymer networks, while the tribological response was evaluated by reciprocating sliding motion against alumina ceramic ball. The hydrogel samples were synthesized using two different ratios of crosslinking agent (X.A%) to study the effect of crosslinking on wear resistance of the material. Various loads and sliding speeds were considered to simulate human gait/running cycle, with and without presence of bovine serum as lubricant. Mass loss was quantified by gravimetric measurement of dried samples before and after each test, while the wear volume was measured by profilometry. An increase in the crosslinker concentration resulted in improvements of up to 21% the elastic modulus and 32% the hardness. A trend was observed in mass loss increase with higher loading regardless of crosslinker concentration. However, under higher sliding speed less material was removed due to wear. With lubrication and under the highest load, the minimum mean friction coefficient was obtained for samples with 0.06 X.A% (0.010 +/- 2.6E-3) which is promising when compared to that of articular cartilage. Visual inspection of worn surfaces by electron microscopy revealed adhesion as the dominant wear mechanism. Overall, the hydrogels with higher crosslinking density were considered as a potential candidate, due to higher stiffness and better tribological performance under lubrication.
机译：由于其生物相容性和有前途的性质，建议藻酸盐/聚丙烯酰胺（ALG / PAAM）杂交水凝胶作为骨科假体。然而，它们的摩擦和磨损表演仍然持续了探索。在该研究中，进行压痕试验以获得ALG / PAAM互穿聚合物网络的机械性能，而通过对氧化铝陶瓷球的往复滑动进行往复运动来评估摩擦学响应。使用两种不同的交联剂（X.A％）比例合成水凝胶样品，以研究交联对材料耐磨性的影响。认为各种负载和滑动速度被认为是模拟人的步态/跑步循环，随着牛血清作为润滑剂的存在。通过在每次试验之前和之后的干燥样品的重量测量来量化质量损失，同时通过轮廓测量测量磨损体积。交联剂浓度的增加导致弹性模量高达21％和32％的硬度。无论交联剂浓度如何，在大规模损失增加中都观察到趋势。然而，在较高的滑动速度下，由于磨损而取出更少的材料。通过润滑并且在最高载荷下，对于0.06×10℃（0.010 +/- 2.6E-3）的样品获得最小平均摩擦系数，其与关节软骨相比具有很有希望的。通过电子显微镜观察磨损表面的视觉检查显示粘附作为主导磨损机构。总的来说，由于润滑下的刚度和更好的摩擦学性能，具有较高交联密度的水凝胶被认为是潜在的候选者。

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