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中文摘要：
将聚乙烯醇（PVA）和纳米羟基磷灰石（HA）按一定比例共混，采用反复冷冻-融化法制备出PVA／HA复合水凝胶．观察了PVA／HA复合水凝胶的微观结构和晶态结构，并在小牛血清稀释液润滑条件下进行了PVA／HA复合水凝胶与牛膝关节软骨的摩擦磨损试验．结果表明：随着冷冻-融化循环数的增加，PVA／HA复合水凝胶结构中氢键的作用增强，缠结结构链上的交联点增多，复合水凝胶的结晶度也随之提高，微孔结构趋于完整，因而使其压缩刚度增大；PVA／HA复合水凝胶与牛膝关节软骨的摩擦系数、接触变形和磨损量都随着冷冻-融化循环数的增加而显著减小，使复合水凝胶的减摩性和耐磨性提高．
英文摘要：
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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