中文摘要：

近年来，高吸水性树脂以其优异的性能在医用材料和生理卫生材料领域获得了广泛的应用，如作为快速止血材料、卫生巾、尿布和卫生衬垫等。作为这类用途的树脂，必须具有较快的吸水速率。高吸水性树脂与水接触时，主要通过亲水基团与水分子之间的作用为水分子的运动提供驱动力，同时，由于网络内外的渗透压差促进水分子向网络内部运动。

英文摘要：

With initiator of ammonium persulfate, acrylic acid was graft polymerized on the chain of carboxymethyl chitosan. After crosslinked with N,N＇-methylene diacrylamide and gas foamed with NaHCOz, a kind of novel superabsorbent polymer with macroporous structure, CMCTS-g-PAA, was prepared. The Voigt model was used to characterize the swelling kinetics of the polymer. The significance of the parameters in the Voigt model in the process of swelling was explained. By studying the swelling kinetics and characterizing the polymer with SEM, the effects of the amount of NaHCOz, matching of adding time of NaHCO2 and gelation time on the swelling properties and surface morphology of the polymer were discussed.