Water-Soluble Copolymers .52. Na-23 NMR-Studies of Ion Binding to Anionic Polyelectrolytes: Poly(sodium 2-Acrylamido-2-Methylpropanesulfonate), Poly(sodium 3-Acrylamido-3-Methylbutanoate), Poly(sodium Acrylate), and Poly(sodium Galacturonate)

The relative binding affinities of Na + , K + , Mg 2+ , and Ca 2+ ions to the homopolymers of poly(sodium acrylate) (NaAA), poly(sodium 2-acrylamido-2-methylpropanesulfonate) (NaAMPS), and poly(sodium 3-acrylamido-3-methylbutanoate) (NaAMB) were investigated. The addition of Mg 2+ and Ca 2+ to the biopolymer poly(sodium galacturonate) (NaGAL) was also investigated. Addition of salts yielded the order of binding Ca 2+ > Mg 2+ > K + ∼ Na + for NaAA and NaAMB and Ca 2+ ∼ Mg 2+ > K + > Na + for NaAMPS