Translational Diffusion Coefficient of Sodium Poly(2-acrylamido-2-methylpropanesulfonate) in Aqueous Sodium Chloride |
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Authors: | Junko Yashiro Takashi Norisuye |
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Affiliation: | (1) Department of Macromolecular Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama-cho, Toyonaka Osaka, 560-0043, Japan |
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Abstract: | Summary Dynamic light scattering measurements have been made on 9 samples of sodium poly(2-acrylamido-2-methylpropanesulfonate), an
intrinsically flexible, linear poly-electrolyte, ranging in weight-average molecular weight from 2.9×104 to 1.5×106 with 0.05 and 0.5 M aqueous NaCl at 25 °C as the solvents. The measured translational diffusion coefficients or hydrodynamic
radii RH are analyzed on the basis of the wormlike chain with excluded volume. The quasi-two-parameter theory for the hydrodynamic-radius
expansion factor with the known expression for the translational friction coefficient of an unperturbed wormlike chain describes
the molecular weight dependence of RH in the aqueous salts with a degree of accuracy very similar to that known for nonionic flexible polymers in good solvents. |
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