A method for preparing a hydrogel that reversibly changes color depending on pH includes: (S10) dissolving a carboxyl group-containing polysaccharide in buffer to obtain a polysaccharide solution; (S20) adding a cross-linker solution composed of a mixture of an organic solvent and a cross-linker to the polysaccharide solution; (S30) adding, to the cross-linker-containing polysaccharide solution resulting from step (S20), an organic solution composed of a mixture of an organic solvent and a first organic compound containing an aromatic functional group having at least one hydroxyl group bonded thereto, to form a mixture solution, and allowing the mixture solution to react; (S40) obtaining a polymer complex from the reaction mixture resulting from step (S30); and (S50) mixing the polymer complex from step (S40) with an organic dye comprising a second organic compound containing an aromatic functional group having at least one hydroxyl group bonded thereto.
一种根据pH值可逆地改变颜色的
水凝胶的制备方法包括:(S10)将含羧基的
多糖溶解于缓冲液中,得到
多糖溶液; (S20)向
多糖溶液中加入由有机溶剂和
交联剂的混合物组成的
交联剂溶液;(S30) 向步骤(S20)得到的含
交联剂的
多糖溶液中加入由有机溶剂和含有至少一个羟基键合的芳香官能团的第一有机化合物的混合物组成的有机溶液,形成混合物溶液,并使混合物溶液反应;(S40) 从步骤(S30)得到的反应混合物中得到聚合物复合物;以及 (S50) 将步骤(S40)得到的聚合物复合物与有机
染料混合,该有机
染料包含第二种有机化合物,该第二种有机化合物含有至少一个羟基键合的芳香族官能团。