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Improved biotribological properties of polyetheretherketone composites for artificial joints with a ‘soft-on-hard’ structure and brushlike molecules
Tribology international ( IF 3.517 ) Pub Date : 2020-01-09 , DOI: 10.1016/j.triboint.2020.106165
Yuntong Liu; Dangsheng Xiong; Xiaoduo Zhao

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.
更新日期:2020-01-11

 

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