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Home  >  Journal list  >  Polymer Journal  >  Vol.38  No.8 (2006)  >  pp.861-867

Polymer Journal
<<Previous article Vol.38  No.8 (2006)   pp.861 - 867 Next article>>

Electrostatic Contributions to Chain Stiffness and Excluded-Volume Effects in Sodium Poly(2-acrylamido-2-methylpropanesulfonate) Solutions

Ryo Hagino1), Junko Yashiro1), Michiko Sakata1) and Takashi Norisuye1)
1) Department of Macromolecular Science, Graduate School of Science, Osaka University

ABSTRACT:  Chain stiffness and excluded-volume effects in 0.005–1 M aqueous NaCl solutions of sodium poly(2-acrylamido-2-methylpropanesulfonate) (Na PAMPS) at 25 °C have been studied by viscometry on 15 samples with weight-average molecular weights of 1.7×103–7.1×105. The molecular weight dependence of intrinsic viscosity at each NaCl concentration Cs is analyzed by a combination of Yoshizaki et al.’s theory for unperturbed wormlike chains and the quasi-two-parameter theory for excluded-volume effects to estimate the persistence length q and the excluded-volume strength B as functions of Cs. Both q and its electrostatic contribution qel are close to the previously estimated values for Na poly(styrenesulfonate) (Na PSS) at the same Cs, while B considerably differs between the two polymers. As was found for Na PSS, available polyelectrolyte theories fail to describe the Cs-dependence of qel and B for Na PAMPS.


Keyword:
Polyelectrolyte/ Poly(2-acrylamido-2-methylpropanesulfonate)/ Wormlike Chain/ Chain Stiffness/ Electrostatic Persistence Length/ Excluded-Volume Effect

Published online: August 10, 2006
© Copyright, 2006 by The Society of Polymer Science, Japan

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