Chen Kai, Liu Jinlong, Yang Xuehui, Zhang Dekun
School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221116, PR China.
School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221116, PR China.
Mater Sci Eng C Mater Biol Appl. 2017 Sep 1;78:520-529. doi: 10.1016/j.msec.2017.04.117. Epub 2017 Apr 20.
PVA-HA/PAA composite hydrogel is prepared by freezing-thawing, PEG dehydration and annealing method. Orthogonal design method is used to choose the optimization combination. Results showed that HA and PVA have the maximum effect on water content. PVA and freezing-thawing cycles have the maximum effect on creep resistance and stress relaxation rate of hydrogel. Annealing temperature and freezing-thawing cycles have the maximum effect on compressive elastic modulus of hydrogel. Comparing with the water content and mechanical properties of 16 kinds of combination, PVA-HA/PAA composite hydrogel with freezing-thawing cycles of 3, annealing temperature of 120°C, PVA of 16%, HA of 2%, PAA of 4% has the optimization comprehensive properties. PVA-HA/PAA composite hydrogel has a porous network structure. There are some interactions between PVA, HA and PAA in hydrogel and the properties of hydrogel are strengthened. The annealing treatment improves the crystalline and crosslinking of hydrogel. Therefore, the annealing PVA-HA/PAA composite hydrogel has good thermostability, strength and mechanical properties. It also has good lubrication property and its friction coefficient is relative low.
PVA-HA/PAA复合水凝胶通过冻融、PEG脱水和退火法制备。采用正交设计法选择优化组合。结果表明，HA和PVA对含水量影响最大。PVA和冻融循环对水凝胶的抗蠕变性和应力松弛率影响最大。退火温度和冻融循环对水凝胶的压缩弹性模量影响最大。与16种组合的含水量和力学性能相比，冻融循环3次、退火温度120°C、PVA 16%、HA 2%、PAA 4%的PVA-HA/PAA复合水凝胶具有最佳综合性能。PVA-HA/PAA复合水凝胶具有多孔网络结构。水凝胶中PVA、HA和PAA之间存在一些相互作用，增强了水凝胶的性能。退火处理改善了水凝胶的结晶和交联。因此，退火后的PVA-HA/PAA复合水凝胶具有良好的热稳定性、强度和力学性能。它还具有良好的润滑性能，摩擦系数相对较低。
