Although having been widely investigated, polymer hydrogels still have many defects like poor tribological properties and insufficient durability, hindering their further applications in biomedical fields. In this study, we present a simple method to synthesize polyacrylic acid‐polyacrylamide‐ferric ion (PAA‐PAAm‐Fe³⁺) dual‐crosslinked hydrogels with self‐healing abilities and “soft‐hard” hydrogel‐polyetheretherketone (PEEK) combined load‐bearing surfaces with low friction coefficients. After analytical characterizations, the results demonstrated that the hydrogels could repair themselves without any external stimuli. Because of the excellent biphasic and aqueous lubrication provided by the hydrogel layer and the load‐bearing capacity provided by the PEEK substrate, the friction coefficient of a load‐bearing surface was as low as 0.048 in water, much lower than a pristine PEEK block or a hydrogel block sample. This work fabricated self‐healable PAA‐PAAm‐Fe³⁺ hydrogels and low friction bearing surfaces, successfully improving the tribology properties of hydrogels, hopefully promoting their applications as biomedical materials such as articular cartilage. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48499.

中文翻译：

---

具有良好的生物摩擦性能的自修复聚丙烯酸酯-聚丙烯酰胺-铁离子双交联水凝胶，作为承重表面

尽管已经被广泛研究，但是聚合物水凝胶仍然具有许多缺点，例如摩擦学性能差和耐久性不足，从而阻碍了它们在生物医学领域的进一步应用。在这项研究中，我们提出了一种简单的方法来合成聚丙烯酸-聚丙烯酰胺-铁离子（PAA-PAAm-Fe ³⁺）具有自愈能力的双交联水凝胶和“软硬”水凝胶-聚醚醚酮（PEEK）结合了具有低摩擦系数的承重表面。经过分析表征后，结果表明水凝胶可以在没有任何外部刺激的情况下自我修复。由于水凝胶层提供了出色的双相和水相润滑，以及PEEK基材提供的承重能力，承重表面在水中的摩擦系数低至0.048，远低于原始的PEEK嵌段或水凝胶块样品。这项工作制造了可自愈的PAA-PAAm-Fe ³⁺水凝胶和低摩擦轴承表面，成功改善了水凝胶的摩擦学性能，有望促进其作为生物医学材料（如关节软骨）的应用。分级为4 +©2019 Wiley Periodicals，Inc.J.Appl。Polym。科学 2020，137，48499。