致孔法制备新型CMCTS-g-PAA大孔高吸水树脂

在过硫酸铵的引发下，使丙烯酸在羧甲基壳聚糖的分子链上接枝聚合，以N,N’-亚甲基双丙烯酰胺为交联剂，并加入NaHCO₃为致孔剂，制得具有大孔结构的羧甲基壳聚糖接枝聚丙烯酸（CMCTS-g-PAA）高吸水性树脂。采用Voigt模型成功地对树脂的溶胀动力学进行了模拟，并确定了模型中的各参数在高吸水树脂溶胀过程中的意义。通过溶胀动力学及SEM的表征，研究讨论了致孔剂的加入量，致孔剂加入时间与聚合物的凝胶过程的配合等因素对所合成树脂的表面形貌和吸水速率的影响。

Preparation of CMCTS-g-PAA macroporous superabsorbent polymer by foaming method

With initiator of ammonium persulfate, acrylic acid was graft polymerized on the chain of carboxymethyl chitosan.After crosslinked with N,N ′-methylenediacrylamide and gas foamed with NaHCO₃, 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 NaHCO₃, matching of adding time of NaHCO₃ and gelation time on the swelling properties and surface morphology of the polymer were discussed.