期刊
TRIBOLOGY INTERNATIONAL
卷 155, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.triboint.2020.106808
关键词
PEEK-Hydrogel composite structure; Electrostatic adsorption; Biotribological properties; Artificial joints
资金
- National Natural Science Foundation of China [51975296]
- Jiangsu Key Laboratory of Advanced Micro/Nano Materials and Technologies
A PEEK-hydrogel composite structure was designed and fabricated to improve the contact mode of artificial joints, with a significantly reduced friction coefficient achieved through the adsorption of cationic molecules via electrostatic interaction. This novel approach provides a new route for developing the friction surface of artificial joints with advanced performance.
To improve the contact mode of artificial joints and their tribological performance, inspired by the 'soft-on-hard' structure of 'cartilage-subchondral bone' as well as negatively charged characteristic of the cartilage surface with brush-like molecules, a polyetheretherketone (PEEK)-hydrogel composite structure with negatively charged surface adsorbing cationic molecules through electrostatic interaction was designed and fabricated. Characterization results demonstrated that polyacrylic acid (PAA) hydrogel strengthened by polyvinyl alcohol (PVA) microcrystals was successfully fabricated on the PEEK substrate through ultra-violet (UV) radiation. Adsorption of cationic monomers was also confirmed. The PEEK-hydrogel composite structure had significantly reduced friction coefficient, similar to 80% lower than that of PEEK, owing to the synergistic effect of biphasic and boundary lubrication. This work proposes a novel route to develop the friction surface of artificial joints with advanced performance and contributes to the understanding of lubrication mechanism of artificial joints.
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