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Research on the structrue characterization and the biotribological behaviors of PVA/HA composite hydrogel

SHEN Yanqiu ZHANG Dekun GE Shirong~(**) (School of Materials Science and Engineering,China University of Mining and Technology,Xuzhou 221116)  
The poly(vinyl alcohol)and hydroxylapatite were blended in a certain proportion.The Poly(vinyl alcohol)/Hydroxylapatite(PVA/HA)composite hydrogel was prepared by reiterative freezing- thawing method.The microstructures of PVA/HA composite hydrogels were observed,and the crystal structures were characterized.The sliding wear tests between the PVA/HA composite hydrogel and bovine knee articular cartilage were performed in the diluted bovine serum solution.The results showed that the effects of the hydrogen bonds,the cross-linking points in the tangled construction and the crystallization of the PVA/HA composite hydrogel increase with the increasing of freezing-thawing cycles.Its network structures tend to perfect conditions,so the compression rigidity improves.The coefficient of friction, the contact deformation and the wear depth between the PVA/HA composite hydrogel and bovine knee articular cartilage are inversely proportional to the freezing-thawing cycles,so the friction-reducing and anti-wear properties improve.
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