Abstract: Chitosan-acrylic acid-hydroxyethyl methacrylate（CS-AA-HEMA）hydrogel with high hardness was synthesized in acrylic acid（AA）solution with chitosan（CS）and 2-hydroxyethyl methacrylate（HEMA）using glutaraldehyde as crosslinker. Effects of concentrations of CS，AA and HEMA as well as the gel placed time on the hardness of hydrogel，and the state and distribution of water in the hydrogel were investigated. Results indicated that the hardness of CS-AA-HEMA hydrogel increased first and then decreased gradually with the increase in AA concentration，and the hardness increased obviously with the increase in concentrations of HEMA and CS as well as the extension of gel placed time. There were free water，intermediate water and non-freezing water in the CS-AA-HEMA hydrogel. When the concentration of AA was 7.257 mol/L，the hydrogel showed the highest content of equilibrium water and freezing water with 65.412% and 61.537%，respectively；while when the AA concentration was 4.354 mol/L，the hydrogel showed the highest non-freezing water with up to 13.549%. The dehydration temperature of CS-AA-HEMA hydrogel was 20—200 ℃，and the decomposition temperature was 380—470 ℃.

摘要： 以壳聚糖、丙烯酸和甲基丙烯酸羟乙酯为原料、戊二醛为交联剂合成了高强度壳聚糖-丙烯酸-甲基丙烯酸羟乙酯水凝胶。探讨了丙烯酸、甲基丙烯酸羟乙酯、戊二醛浓度和存放时间对该水凝胶硬度的影响，研究了水凝胶中水的状态和分布情况。结果表明，随着丙烯酸浓度的增大，壳聚糖-丙烯酸-甲基丙烯酸羟乙酯水凝胶硬度先增大后逐渐减小，而随着甲基丙烯酸羟乙酯、戊二醛浓度的增大、存放时间的延长，水凝胶硬度有明显增大；壳聚糖-丙烯酸-甲基丙烯酸羟乙酯水凝胶中存在自由水、中间水和非冻结水，7.257 mol/L丙烯酸制备的水凝胶平衡水和冻结水含量最高，分别为65.412%、61.537%，而4.354 mol/L丙烯酸制备的水凝胶非冻结水含量最高，为13.549%；壳聚糖-丙烯酸-甲基丙烯酸羟乙酯水凝胶失水温度为20～200 ℃，分解温度为380～470 ℃。