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首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >A novel polyvinyl alcohol hydrogel functionalized with organic boundary lubricant for use as low-friction cartilage substitute: Synthesis, physical/chemical, mechanical, and friction characterization
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A novel polyvinyl alcohol hydrogel functionalized with organic boundary lubricant for use as low-friction cartilage substitute: Synthesis, physical/chemical, mechanical, and friction characterization

机译：一种用有机边界润滑剂官能化的新型聚乙烯醇水凝胶，可用作低摩擦软骨替代物：合成，物理/化学，机械和摩擦特性

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摘要

A novel material design was developed by functionalizing polyvinyl alcohol hydrogel with an organic low-friction boundary lubricant (molar ratios of 0.2, 0.5, and 1.0 moles of lauroyl chloride). The hydrogels were fabricated using two different techniques. First, the boundary lubricant was initially functionalized to the polymer, then the hydrogels were created by physically crosslinking the reacted polymer. Second, hydrogels were initially created by crosslinking pure polyvinyl alcohol, with the functionalization reaction performed on the fully formed gel. After the reaction, Fourier transform infrared spectroscopy and attenuated total reflectance spectra revealed a clear ester peak, the diminishment of the alcohol peak, and the amplification of the alkyl peaks, which confirmed attachment of the hydrocarbon chains to the polymer. Additional chemical characterization occurred through elemental analysis where an average increase of 22% carbon and 40% hydrogen provided further confirmation of attachment. Physical characterization of the boundary lubricant functionalized hydrogels was performed by water content and contact angle measurements. Water content dependency showed that method 1 had a direct relationship with boundary lubricant concentration, and method 2 displayed an inverse relationship. The contact angle increased as boundary lubricant concentration increased for the pure matrix material for both processing methods, suggesting that the hydrocarbons produced surface properties that mimic natural cartilage, and contact behavior of the biphasic system was dependent on processing method. Friction tests demonstrated a significant decrease in friction coefficient, with a maximum decrease of 70% and a minimum decrease of 24% for boundary lubricant functionalized hydrogels compared with nonfunctionalized polyvinyl alcohol hydrogels.
机译：通过用有机低摩擦边界润滑剂（摩尔比为0.2、0.5和1.0摩尔月桂酰氯）功能化聚乙烯醇水凝胶，开发了一种新颖的材料设计。使用两种不同的技术制备水凝胶。首先，首先将边界润滑剂官能化成聚合物，然后通过物理交联反应后的聚合物来生成水凝胶。其次，首先通过交联纯聚乙烯醇来生成水凝胶，然后对完全形成的凝胶进行官能化反应。反应后，傅立叶变换红外光谱和衰减的全反射光谱显示出清晰的酯峰，醇峰的减少和烷基峰的放大，这证实了烃链与聚合物的连接。通过元素分析进行​​了另外的化学表征，其中平均增加22％的碳和40％的氢提供了附着的进一步确认。边界润滑剂官能化水凝胶的物理表征通过水含量和接触角测量进行。水分依赖性表明方法1与边界润滑剂浓度具有直接关系，而方法2显示出相反的关系。对于这两种加工方法，接触角均随着纯基质材料中边界润滑剂浓度的增加而增加，这表明碳氢化合物产生的模拟天然软骨的表面特性，且双相体系的接触行为取决于加工方法。摩擦试验表明，与非官能化聚乙烯醇水凝胶相比，边界润滑剂官能化水凝胶的摩擦系数显着降低，最大降低幅度为70％，最小降低幅度为24％。

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