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3D成型SiO2/PVA水凝胶支架的摩擦行为

Friction behavior of 3D printing SiO2/PVA hydrogel scaffold

    摘要
  • 摘要: 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（10-2~1 m/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。

     

    Abstract: SiO2/polyvinyl alcohol (PVA) hydrogel scaffold with different porosities was prepared by two-step method of pre forming and post freezing cross-linking using 3D printing technology. The reproducible friction behaviors of SiO2/PVA hydrogel scaffold was researched and the friction principle of SiO2/PVA hydrogel scaffold was analyzed. The results show that SiO2/PVA hydrogel scaffold can keep a three dimensional through structure with maximum porosity of 42.3%. At low friction velocity(10-6-10-3 m/s), the frictional force of SiO2/PVA hydrogel scaffold is slightly higher than that of bulk SiO2/PVA hydrogel and decreases slightly with the increase of porosity. At high friction velocity(10-2-1 m/s), the frictional force of SiO2/PVA hydrogel scaffold is equal to that of bulk SiO2/PVA hydrogel and the effect of porosity on the frictional force for scaffold is not obvious. At small normal pressure load(0.3 kPa), SiO2/PVA hydrogel scaffold shows better reproducible friction property than bulk SiO2/PVA hydrogel. It is related to the structure of the scaffold which can keep a stable hydrated lubrication layer.

     

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