Journal
POLYMER
Volume 44, Issue 5, Pages 1671-1679Publisher
ELSEVIER SCI LTD
DOI: 10.1016/S0032-3861(02)00919-9
Keywords
polysulfobetaine; ionic polymer; phase diagram
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The zwitterionic monomer, 3-(NN-diallylanunonio)propanesulfonate, was copolymerized with sulfur dioxide in dimethyl sulfoxide using azo-bis-isobutyronitrile (AIBN) to afford the polysulfobetaine (PSB) copolymer in excellent yields. The PSB was converted into the corresponding anionic polyelectrolyte (APE) by treatment with I equiv. of sodium hydroxide. The solution properties of PSB and APE were investigated by potentiometric and viscometric techniques. The critical (minimum) salt concentrations (CSC) required to promote water solubility for the PSB at 23degreesC have been measured. Basicity constant of the amine functionality in APE is found to be 'apparent' and as such follow the modified Henderson-Hasselbalch equation. The composition and phase diagram of the aqueous two-phase polymer systems of PSB (treated with 0.60 equiv. sodium hydroxide) and poly(ethyelene glycol) (PEG) in 0.1N KC1 has been studied for the first time for this class of PSB copolymer. (C) 2003 Elsevier Science Ltd. All rights reserved.
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