高强度Poly(AM-co-IA)/Al_2O_3纳米复合水凝胶的制备及形状记忆行为

Preparation and Shape Memory Behavior of Poly (IA-co-AM)/Al_2O_3 Nanocomposite Hydrogels with High Strength

以氧化铝(Al_2O_3)纳米粒子作为无机交联剂,丙烯酰胺(AM)和衣康酸(IA)为单体,原位自由基聚合制备了高强度PAI/Al_2O_3纳米复合水凝胶,并提出了水凝胶的交联机理。对纳米复合水凝胶的力学性质、微观结构和溶胀性质进行了表征。结果表明,制备的水凝胶具有优异力学性能,拉伸和压缩强度分别可达477 k Pa和13.45 MPa。此外,PAI/Al_2O_3纳米复合水凝胶还表现出透明的外观,规整的网络结构,较低的溶胀率以及水驱动的形状记忆行为。因此,这种水凝胶在生物医学领域有广阔的应用前景。

Hydrogels with excellent mechanical properties have great potentials to be used in various biomedical applications.In this study,high strength nanocomposite hydrogels were prepared by in situ polymerization of acrylamide（AM）and itaconic acid（IA）using alumina（Al2O3）nanoparticles as inorganic cross-linking agent.Due to the strong hydrogen bonding between Al2O3and polymer chains,the resulting hydrogels exhibit outstanding mechanical properties.The tensile and compressive strength are found to be up to 477 k Pa and 13.45 MPa,respectively.In addition,these hydrogels also reveal highly transparent appearance,ordered microstructure,low swelling ratios as well as shape memory behaviors.Therefore,this kind of hydrogels would have potential applications in various biomedical fields.