摘要
为提高聚乙烯醇(PVA)水凝胶凝胶分数、吸水率、保水率和降低其溶蚀率,采用PVA/海藻酸钠(SA)循环冻融成型方法,并结合钙离子交联处理制备互穿网络水凝胶,探究了Ca~(2+)交联处理对PVA/SA复合水凝胶吸水保水性能和溶蚀率的影响规律。结果表明:PVA7SA3、0.05mol/L、4h条件下溶蚀率最小(2.33%),凝胶分数最高(92.6%);PVA7SA3、0.01mol/L、2h条件下吸水最高(350%),凝胶分数较低(85.9%),但均与PVA对照组水凝胶存在统计学差异。PVA8SA2在1h内保水性能最好,0.05mol/L浓度下处理4h保水率可达60%。结果表明,增大Ca~(2+)交联浓度和延长交联处理时间对提高凝胶分数有积极影响,水凝胶溶蚀率和吸水率变化均与凝胶分数呈负相关。
To improve the gel fraction,water absorption rate,water retention rate and corrosion ratio of polyvinyl alcohol(PVA)hydrogel,PVA/sodium alginate(SA)cyclic freeze-thaw forming method combined with calcium ion crosslinking treatment is used to prepare interpenetrating network hydrogel.The effect of Ca~(2+)cross-linking treatment on the water-holding performance and corrosion ratio of PVA/SA composite hydrogel is investigated.The results show that the corrosion ratio is the lowest(2.33%)and the gel fraction is highest(92.6%)under PVA7SA3,0.05mol/L,4h,while the water absorption is the highest(350%)and the gel fraction is lower(85.9%)in the case of PVA7SA3,0.01mol/L,2h,which are all statistically different from the PVA control hydrogel.Besides,PVA8SA2 has the best water retention performance within 1hand its water retention rate can reach 60%after 4htreatment at 0.05mol/L concentration.Conclusions are as follows:increasing the Ca~(2+)cross-linking concentration and prolonging the cross-linking treatment time have a positive effect on enhancing the gel fraction;the hydrogel corrosion ratio and water absorption change are negatively correlated with the gel fraction.
引文
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