以丙烯酸和琼脂为主要原料、Fe2+/过硫酸铵为氧化/还原引发体系,制备具有高弹性的双网络水凝胶.通过研究丙烯酸和Fe2+含量对水凝胶性能的影响,得出适宜的工艺条件为琼脂溶液质量浓度1％,丙烯酸质量分数30％,过硫酸铵质量分数1.5％,N,N'-亚甲基双丙烯酰胺质量分数0.3％,硫酸亚铁质量分数0.050％.对该条件下制备的水凝胶的力学性能进行分析测试发现,水凝胶的断裂拉伸率可达225％,抗压能力可达4 MPa,具有良好的拉伸和压缩性能.利用SEM,IR对该水凝胶进行微观形貌分析和结构表征发现,水凝胶的微观形貌具有纤维网络结构,纤维直径约为100 nm,琼脂与聚丙烯酸之间存在分子间氢键作用,Fe3+与聚丙烯酸分子中的羧酸基因发生了金属络合作用.%Dual-network hydrogels with high elasticity were prepared by oxidation/reduction (Fe2+/ammonium persulfate) initiation system using acrylic acid and agar as the main raw materials.The optimum conditions were obtained as follows:agar mass concentration was 1％,masacrylic acid concentration was 30％ (mass fraction),ammonium persulfate concentration was 1.5 ％ (mass fraction),N,N'-Methylenebisacrylamide concentration was 0.3％ (mass fraction),and ferrous sulfate concentration was 0.050％ (mass fraction).Through the analysis of the mechanical properties of the gel,it was found that the tensile elongation of the gel was 225％ and the compressive capacity was 4 MPa,exhibiting good stretch and compression performance.The microstructure of the hydrogel were analyzed by IR using SEM.The results showed that the hydrogel has a fiber network structure with a fiber diameter of about 100 nm,there was intermolecular hydrogen bonding between agar and polyacrylic acid and the metal complexation between Fe3+ and polyacrylic acid molecules.
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