A tannic acid-reinforced PEEK-hydrogel composite material with good biotribological and self-healing properties for artificial joints,Journal of Materials Chemistry B

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A tannic acid-reinforced PEEK-hydrogel composite material with good biotribological and self-healing properties for artificial joints
Journal of Materials Chemistry B ( IF 6.1 ) Pub Date : 2021-08-13 , DOI: 10.1039/d1tb01357b
Yuntong Liu ₁ , Dangsheng Xiong ₁

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Polyetheretherketone (PEEK) is widely considered as a promising material for joint implants but it still has limitations involving high friction and wear. To mimic the cartilage-subchondral bone structure in natural joints, a polyvinyl alcohol (PVA) hydrogel layer was fabricated on the PEEK substrate to provide a lubrication mechanism. In addition, tannic acid was applied to form dynamic hydrogen bonds with PVA molecules, for the purpose of strengthening the hydrogel layer and endowing it with self-healing ability. Our experimental results demonstrated that the prepared PEEK-hydrogel composite exhibited good biotribological performance with a low average friction coefficient around 0.06 and little wear after the friction test. It also could repair the scratch made by a blade spontaneously at room temperature taking advantage of the reversibility of the hydrogen bonds. The influence of the properties of the PVA hydrogel and the concentration of tannic acid on the frictional and self-healing behavior of the composite structure was investigated and the internal mechanism was discussed. This work presents a facile method to fabricate a PEEK-hydrogel composite possessing outstanding tribological properties and self-healing capacity simultaneously, hopefully promoting its potential in producing artificial joints.

中文翻译：

具有良好生物摩擦学和自愈性能的单宁酸增强PEEK-水凝胶复合材料用于人工关节

聚醚醚酮 (PEEK) 被广泛认为是一种有前途的关节植入材料，但它仍然存在涉及高摩擦和磨损的局限性。为了模拟自然关节中的软骨-软骨下骨结构，在 PEEK 基底上制造了聚乙烯醇 (PVA) 水凝胶层以提供润滑机制。此外，单宁酸与PVA分子形成动态氢键，以增强水凝胶层并赋予其自愈能力。我们的实验结果表明，制备的 PEEK-水凝胶复合材料表现出良好的生物摩擦学性能，平均摩擦系数低至 0.06 左右，摩擦试验后磨损小。它还可以利用氢键的可逆性在室温下自发修复刀片造成的划痕。研究了PVA水凝胶的性能和单宁酸浓度对复合结构摩擦和自愈行为的影响，并讨论了其内在机理。这项工作提供了一种简便的方法来制造同时具有出色摩擦学性能和自愈能力的 PEEK-水凝胶复合材料，有望提升其在生产人工关节方面的潜力。

更新日期：2021-09-03

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