Abstract
The intrinsic viscosity, [η], was measured for the betaine-type polyampholyte, poly(2-(methacryloyloxy)ethyl 2-(trimethylammonio)ethyl phosphate), in aqueous solution at various pH and ionic strengths, I. The linear relationship between 1/√I and [η] for ordinary polyelectrolytes was also observed for the polyampholyte at low I near isoionic pH and over a wide range of I at other pH. By comparing I dependence of the electrostatic expansion factor of the polyampholyte with that of poly(sodium acrylate), it is suggested that there is a pronounced intramolecular attraction between the segments due to the oppositely-charged groups even when pH deviates from the isoionic pH.
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Muroga, Y., Amano, M., Katagiri, A. et al. PH and Ionic Strength Dependences of the Intrinsic Viscosity of Betaine-Type Polyampholyte. Polym J 27, 65–70 (1995). https://doi.org/10.1295/polymj.27.65
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DOI: https://doi.org/10.1295/polymj.27.65