Graphene oxide (GO) was incorporated into polyvinyl alcohol (PVA) hydrogel to improve its mechanical and tribological performances for potential articular cartilage replacement application. The compressive mechanical properties, creep resistance, and dynamic mechanical properties of PVA/GO hydrogels with varied GO content were studied. The frictional behavior of PVA/GO hydrogels under stationary and migrating contact configurations during reciprocal and unidirectional sliding movements were investigated. The effects of load, sliding speed, diameter of counterface, and counterface materials on the frictional coefficient of PVA/GO hydrogels were discussed. PVA/0.10wt%GO hydrogel show higher compressive modulus and creep resistance, but moderate friction coefficient. The friction coefficient of PVA/GO hydrogel under stationary and migratory contact configurations greatly depends on interstitial fluid pressurization and tribological rehydration. The friction behavior of PVA/GO hydrogels shows load, speed, and counterface diameter dependence similar to those observed in natural articular cartilage. A low friction coefficient (~ 0.03) was obtained from PVA/0.10wt%GO hydrogel natural cartilage counter pair.

Graphical Abstract

中文翻译：

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迁移和固定接触条件下摩擦学复水及其对PVA / GO水凝胶替代软骨的摩擦行为的作用

将氧化石墨烯（GO）掺入聚乙烯醇（PVA）水凝胶中，以改善其机械和摩擦学性能，以用于潜在的关节软骨置换应用。研究了GO含量不同的PVA / GO水凝胶的压缩力学性能，抗蠕变性和动态力学性能。研究了PVA / GO水凝胶在往复和单向滑动过程中在静止和迁移接触构型下的摩擦行为。讨论了载荷，滑动速度，对接面直径和对接面材料对PVA / GO水凝胶摩擦系数的影响。PVA / 0.10wt％GO水凝胶显示较高的压缩模量和抗蠕变性，但摩擦系数适中。在静止和迁移接触状态下，PVA / GO水凝胶的摩擦系数很大程度上取决于组织液的加压和摩擦液的再水化。PVA / GO水凝胶的摩擦行为显示出与载荷，速度和对立面直径相关的依赖性，与在天然关节软骨中观察到的相似。从PVA / 0.10wt％GO水凝胶天然软骨计数器对获得低摩擦系数（〜0.03）。

图形概要