Chen Liqi, Zhang Dekun, Zhang Jinsong
School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221116, China.
Sheng Wu Yi Xue Gong Cheng Xue Za Zhi. 2009 Oct;26(5):1021-4.
Gelatin and hydroxyapatite were introduced to polyvinyl alcohol (PVA) hydrogel with an attempt to enhance the performances of PVA hydrogel. Through a reiterative freezing-thawing methods, three kinds of PVA composite hydrogels were prepared. The mechanical performances of these composite hydrogels with the same PVA and HA content but varying gelatin content, such as tensile strength, elasticity modulus, creep curve, relaxation curve and friction coefficient were evaluated by using a computer-controlled universal electronic mechanical testing machine and a UMT-II frictional testing machine. The additional effects of hydroxylapatite and varying gelatin on the performances of composite PVA hydro-gels were analyzed. It was found that the gelatin content directly influenced the physical performances of PVA composite hydrogels; but no linear relationship was recorded. PVA composite hydrogel containing 2wt-% gelatin gave optimal results, i.e. tensile strength of 5.5MPa, compressive elastical modulus of 1.48MPa, creeping rate of 31% in 45 minutes, stress relaxing rate of 40.3%, and the starting friction coefficient of 0.332.
将明胶和羟基磷灰石引入聚乙烯醇（PVA）水凝胶中，试图提高PVA水凝胶的性能。通过反复冻融法制备了三种PVA复合水凝胶。使用计算机控制的万能电子机械试验机和UMT-II摩擦试验机对这些具有相同PVA和HA含量但明胶含量不同的复合水凝胶的力学性能进行了评估，如拉伸强度、弹性模量、蠕变曲线、松弛曲线和摩擦系数。分析了羟基磷灰石和不同明胶对复合PVA水凝胶性能的附加影响。结果发现，明胶含量直接影响PVA复合水凝胶的物理性能；但未记录到线性关系。含有2wt-%明胶的PVA复合水凝胶给出了最佳结果，即拉伸强度为5.5MPa，压缩弹性模量为1.48MPa，45分钟内蠕变速率为31%，应力松弛率为40.3%，起始摩擦系数为0.332。
