高强度物理-化学混杂双网络水凝胶的制备及性质

Preparation and Properties of High Strength Physical-Chemical Hybrid Double-Network Hydrogels

以聚乙烯醇(polyvinyl alcohol,PVA)和丙烯酰胺(acrylamide,AM)为原料,采用"一锅煮"及紫外辐照结合冷冻-解冻两步聚合法制备聚乙烯醇/聚丙烯酰胺(PVA/PAM)混杂双网络水凝胶,并对水凝胶的力学性能、溶胀性能、失水性能以及自愈合性进行测试和分析.结果表明,PVA/PAM混杂双网络水凝胶具有较高的力学强度,其拉伸强度为428kPa,失水速率和单网络水凝胶相比较慢,具有一定的自愈合性.

With polyvinyl alcohol（PVA）and acrylamide（AM）as raw material,PVA/PAM hybrid double-network hydrogel was synthesized by one-pot two-step polymerization method combined UV irradiation and freezing-thawing technology. We tested and analyzed the mechanical property,swelling property,water loss property and self-healing property of hydrogels.The results show that PVA/PAM hybrid double-network hydrogel has high mechanical strength,its tensile strength is428 kPa,the water loss rate is slower than the single network hydrogel.The hybrid double-network hydrogel possesses self-healing property.