A new zwitterionic monomer 3-[diallyl{3-(diethoxyphosphoryl)propyl}ammonio]propane-1-sulfonate has been synthesized and cyclopolymerized to give the corresponding polyzwitterion (6) (PZ) bearing both phosphonate and sulfonate functionalities on each repeating unit. phosphonate ester hydrolysis in PZ gave a pH-responsive dibasic polyzwitterionic acid (6) (PZA) bearing APO 3 H 2 units. The PZA under pHinduced transformation was converted into polyzwitterion/ anion (6 2) (PZAN) and polyzwitterion/dianion (6 5) (PZDAN) having respective APO 3 H 2 and APO 3 22 units. The polymers 0 interesting solubility and viscosity behaviors have been investigated in detail. The apparent protonation constants in salt-free water and 0.1 M NaCl of the APO 3 22 in (6 5) (PZDAN) and APO 3 Hin (6 2) (PZAN) as well as in their corresponding monomeric units have been determined. Evaluation of antiscaling properties of the PZA using supersaturated solution of CaSO 4 revealed %100% scale inhibition efficiency at a meager concentration of 20 ppm for a duration of 45 h at 40 C. The PZA has the potential to be used effectively as an antiscalant in reverse osmosis plant.
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