Group of Mechanical and Biomedical Engineering, Xi'an Key Laboratory of Modern Intelligent Textile Equipment, College of Mechanical and Electronic Engineering, Xi'an Polytechnic University, Xi'an, Shaanxi 710048, PR China.
Group of Mechanical and Biomedical Engineering, Xi'an Key Laboratory of Modern Intelligent Textile Equipment, College of Mechanical and Electronic Engineering, Xi'an Polytechnic University, Xi'an, Shaanxi 710048, PR China.
J Mech Behav Biomed Mater. 2021 Dec;124:104807. doi: 10.1016/j.jmbbm.2021.104807. Epub 2021 Sep 3.
New fabrication methods and lubrication materials must be developed to improve the lubrication performance of artificial joints and increase the lubrication duration. Herein, a novel polyvinyl alcohol/polyethylene glycol/graphene oxide (PVA/PEG/GO) hydrogel was prepared by a physical cross-linking method, and then the hydrogel and its sustained-release solution were used as lubricant for friction evaluation. The results demonstrated that the slow-release gel solution has good lubrication performance, and coefficient of friction (COF) is only 0.04, which is much lower than the COF of distilled water (about 0.08) under the same conditions. The structure characterization results revealed that no new materials are formed in the gel. The results of thermogravimetric analyses and differential scanning calorimetry demonstrated that the addition of GO may improve the network crosslinking structure of the PVA/PEG hydrogel and improve its mechanical strength. In addition, PVA/PEG/GO hydrogel has superior self-healing function. The self-healing hydrogel did not break again after being pulled under 200 G of weights. The PVA/PEG/GO hydrogel with excellent slow-release lubricating performance and self-healing properties provides a novel candidate for design of long-term lubricating artificial joints, and is expected to promote the progress of artificial joint lubrication applications.
必须开发新的制造方法和润滑材料，以提高人工关节的润滑性能并延长润滑时间。在此，通过物理交联法制备了一种新型的聚乙烯醇/聚乙二醇/氧化石墨烯（PVA/PEG/GO）水凝胶，然后将水凝胶及其缓释溶液用作摩擦评估的润滑剂。结果表明，缓释凝胶溶液具有良好的润滑性能，其摩擦系数（COF）仅为 0.04，在相同条件下远低于蒸馏水的 COF（约 0.08）。结构特征结果表明凝胶中未形成新材料。热重分析和差示扫描量热法的结果表明，GO 的加入可能改善了 PVA/PEG 水凝胶的网络交联结构并提高了其机械强度。此外，PVA/PEG/GO 水凝胶具有优异的自修复功能。在 200 G 的重量下被拉伸后，自修复水凝胶没有再次破裂。具有优异的缓释润滑性能和自修复性能的 PVA/PEG/GO 水凝胶为设计长期润滑人工关节提供了一种新的候选材料，有望推动人工关节润滑应用的进展。
