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利用3D成型技术,通过先成型后冷冻交联2步法制备不同孔隙率的SiO_2/聚乙烯醇(PVA)水凝胶支架,研究了SiO_2/PVA水凝胶支架的重复摩擦行为,分析了SiO_2/PVA水凝胶支架的摩擦原理。结果表明:SiO_2/PVA水凝胶支架能够保持三维贯通的立体结构,最大孔隙率可达42.3%。低摩擦速率(10-6~10-3 m/s)下,SiO_2/PVA水凝胶支架摩擦力稍高于块体SiO_2/PVA水凝胶,且随孔隙率的提高而稍有降低;而高摩擦速率(10-2~1m/s)下,SiO_2/PVA水凝胶支架和块体SiO_2/PVA水凝胶的摩擦力相近,孔隙率对支架摩擦力影响不明显。低正压力载荷(0.3kPa)下,SiO_2/PVA水凝胶支架重复摩擦性优于块体SiO_2/PVA水凝胶,这与支架结构能保持稳定的水润滑层相关。
The 3D / PVA hydrogel scaffolds with different porosity were prepared by pre-forming and post-molding cross-linked two-step freeze-drying method. The repeated rubbing behavior of SiO 2 / PVA hydrogel scaffolds was studied. / PVA hydrogel scaffold friction principle. The results show that the SiO_2 / PVA hydrogel scaffold can maintain the three-dimensional through structure and the maximum porosity can reach 42.3%. The friction of SiO 2 / PVA hydrogel scaffold was slightly higher than that of bulk SiO 2 / PVA hydrogel at low friction rate (10-6 ~ 10-3 m / s), and decreased slightly with the increase of porosity At high frictional velocity (10-2 ~ 1m / s), the friction between SiO_2 / PVA hydrogel scaffold and bulk SiO_2 / PVA hydrogel is similar, and the porosity has no obvious effect on the friction. Under the condition of low positive pressure (0.3 kPa), the repeated friction of SiO 2 / PVA hydrogel scaffold is better than that of bulk SiO 2 / PVA hydrogel, which is related to the water lubricated layer with stable scaffold structure.