College of Mechanical and Power Engineering, China Three Gorges University, Yichang 443002, People's Republic of China; State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China.
College of Mechanical and Power Engineering, China Three Gorges University, Yichang 443002, People's Republic of China.
J Colloid Interface Sci. 2019 Nov 15;556:549-556. doi: 10.1016/j.jcis.2019.08.100. Epub 2019 Aug 27.
Hydrogels are widely used in the field of water lubrication and friction, such as artificial cartilage, because of their good wettability and flexibility. Moreover, compared with single network hydrogel, Triple-network (TN) hydrogel has higher fracture stress. Therefore, the research and preparation of a TN hydrogel with good mechanical properties and friction properties will be of great help to the improvement and application of hydrogel properties.
A chemical-physical crosslinked triple-network (TN) hydrogel was prepared using PVA, PVP and AA as raw materials. By controlling the content of Zn in TN hydrogel, conducting tension-compression test and friction test, we studied the effect of Zn on the mechanical properties and friction properties of hydrogel.
The results showed that TN hydrogel had the best mechanical properties when the content of Zn was 0.4 g. The fracture stress was 1.87 MPa, the strain rate was 175%, and the compressive stress was 3.5 MPa under 80% compressive deformation. At room temperature, TN hydrogel had good self-healing property and could maintain a high mechanical recovery rate, with a maximum recovery rate of 87%. The friction test results manifested that the hydrogel had a low friction coefficient, and the minimum friction coefficient was 0.15. The PVA/PVP/PAA-TN hydrogel prepared by this method has widened the application scope of hydrogel, making it more applicable in the field of high friction coefficient and mechanical properties.
水凝胶由于其良好的润湿性和柔韧性，在水润滑和摩擦领域得到了广泛的应用，例如人工软骨。此外，与单网络水凝胶相比，三网络（TN）水凝胶具有更高的断裂应力。因此，研究和制备具有良好机械性能和摩擦性能的 TN 水凝胶将极大地有助于改善和应用水凝胶的性能。
采用 PVA、PVP 和 AA 为原料，制备了一种化学-物理交联的三网络（TN）水凝胶。通过控制 TN 水凝胶中 Zn 的含量，进行拉伸压缩试验和摩擦试验，研究了 Zn 对水凝胶机械性能和摩擦性能的影响。
结果表明，当 Zn 含量为 0.4 g 时，TN 水凝胶具有最佳的机械性能。断裂应力为 1.87 MPa，应变速率为 175%，在 80%压缩变形下压缩应力为 3.5 MPa。在室温下，TN 水凝胶具有良好的自修复性能，能够保持较高的机械恢复率，最大恢复率为 87%。摩擦试验结果表明，水凝胶具有较低的摩擦系数，最小摩擦系数为 0.15。通过这种方法制备的 PVA/PVP/PAA-TN 水凝胶拓宽了水凝胶的应用范围，使其更适用于高摩擦系数和机械性能领域。
