Abstract
A dual‐pH switchable zwitterionic copolymer, poly(2‐(dimethylamino)ethyl methacrylate‐co‐acrylamide‐co‐acrylic acid) (poly(DMAEMA‐co‐AM‐co‐AA)), is synthesized by random copolymerization. Characterized by a sharp change in solution turbidity, the conformation of such polymers in aqueous solutions can be switched at both acidic (low pH) and alkaline (high pH) conditions, with the switching pH being finely tunable by controlling the molar ratio of cationic and anionic functional groups of the copolymer. Study with quartz crystal microbalance with dissipation confirm the origin of the conformational change from electrostatic attractions between cationic DMAEMA and anionic AA functional groups. image
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