电解质溶液对丙烯酸-丙烯酰胺共聚物吸液性能的影响

Effects of aqueous salt solutions on the absorbency of superabsorbents synthesized by inverse suspension copolymerization of acrylic acid with acrylamide were studied. The results showed that the water absorbency of superabsorbents in the salt solutions decreased with increase in the ionic strength of the salt. For the same ionic strength of chloride salt solutions, the water absorbency had the following tendency: Na +>Ca 2+ >Fe 3+ ,Li +>Na +>K +, and Mg 2+ >Ca 2+ >Ba 2+ . The influences of anion valency of salts with a common cationic ion(Na +) on the water absorbency were the order of mononalent<divalent<trivalent anions.