甜菜碱型两性离子聚合物P(AM-DMAPAAS)的盐溶液性质

将丙烯酰胺丙基二甲基胺（DMAPAA）和1，3-丙基磺内酯，在55 ℃下反应20 h，合成了3-（丙烯酰胺丙基二甲胺基）丙磺酸盐（DMAPAAS），将其在盐溶液中与丙烯酰胺（AM）单体进行自由基共聚合反应，获得净电荷为零的磺基甜菜碱型两性离子共聚物P(AM-DMAPAAS)；对该两性离子共聚物进行了表征和溶解性评价。 研究结果表明，共聚物在NaCl溶液中的粘度比在纯水中的大，在Mg2+和Ca2+盐溶液中的粘度更大，且随着溶液浓度的增大而增大，表现出明显的反聚电解质溶液性质。 升高相同温度，两性离子共聚物的粘度保留率是普通聚丙烯酰胺的1.4倍。

Salt Solution Properties of a Zwitterionic Copolymer P(AM-DMAPAAS)

A zwitterionic monomer of 3-(N,N-dimethylamino-N-sulfopropane propyl acrylamide)(DMAPAAS) was prepared by the ring opening reaction of 1,3-cyclopropanesultone with N,N-dimethylamino propyl acrylamide(DMAPAA) at 55 ℃ for 20 h. Zwitterionic copolymers P(AM-DMAPAAS) containing sulfobetaine groups were synthesized by copolymerization of AM and DMAPAAS in aqueous solution. The copolymers were characterized and the solubility of copolymers P(AM-DMAPAAS) was evaluated. The viscosity of the copolymers was determined. The results show that the viscosity of the copolymers in brine solution is greater than that in deionized water, and the viscosity in Mg2+ and Ca2+ salt solution is increased as the salt concentration is increased. The copolymers exhibit a typical antipolyelectrolyte behavior. Under the situation where the same temperature is increased, the viscosity retention of the zwitterionic copolymer is 1.4 times of that of PAM.