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SiO2/聚乙烯醇(PVA)水凝胶支架,研究了SiO2/PVA水凝胶支架的重复摩擦行为,分析了SiO2/PVA水凝胶支架的摩擦原理.结果表明:SiO2/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,SiO2/PVA水凝胶支架摩擦力稍高于块体SiO2/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,SiO2/PVA水凝胶支架和块体SiO2/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(0.3 kPa)下,SiO2/PVA水凝胶支架重复摩擦性优于块体SiO2/PVA水凝胶,这与支架结构能保持稳定的水润滑层相关.
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