Abstract On the purpose of improving the biotribological performance of polyetheretherketone (PEEK) for artificial joints, mimicking the ‘soft-on-hard’ contact mode of ‘cartilage-subchondral bone’ construction as well as the special brushlike structure of natural articular cartilage, a ‘soft-on-hard’ structure with a poly acrylic acid-poly acrylamide (PAA-PAAm) hydrogel layer connected onto a PEEK substrate was fabricated. Meanwhile, methacrylated sodium alginate (SAGMA) was introduced into the hydrogel layer to form molecular brushes. Compared to the friction coefficient of a pristine PEEK (0.22), that of the PEEK-hydrogel-molecular brush structure was significantly lower (0.02) benefiting from the synergistic effect of biphasic lubrication and boundary lubrication. This work develops a useful method to effectively improve the biotribological properties of artificial joints.

中文翻译：

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具有“软对硬”结构和刷状分子的人造关节聚醚醚酮复合材料的生物摩擦学性能的改善

摘要 为了提高人工关节聚醚醚酮（PEEK）的生物摩擦学性能，模仿“软骨-软骨下骨”结构的“软硬结合”接触模式以及天然关节软骨的特殊刷状结构，制造了具有连接到 PEEK 基板上的聚丙烯酸-聚丙烯酰胺 (PAA-PAAm) 水凝胶层的“软对硬”结构。同时，将甲基丙烯酸海藻酸钠（SAGMA）引入水凝胶层以形成分子刷。与原始 PEEK 的摩擦系数 (0.22) 相比，由于双相润滑和边界润滑的协同作用，PEEK-水凝胶-分子刷结构的摩擦系数显着降低 (0.02)。