E. Hirose, A. Iwamoto, T. Norisuye
Nov 10, 1999
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0
Influential Citations
51
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Journal
Macromolecules
Abstract
Sixteen narrow-distribution samples of sodium poly(styrenesulfonate) (NaPSS) ranging in weight-average molecular weight Mw from 2.6 × 103 to 6.5 × 105 were prepared by the radical polymerization of sodium-p-styrenesulfonate, followed by repeated fractional precipitation, and were studied by static light scattering, sedimentation equilibrium, and viscometry in 0.5 M aqueous NaCl at 25 °C and in 4.17 M aqueous NaCl at 16.4 °C, the ϑ point, where the light scattering second virial coefficient vanished for high Mw. The characteristic ratio (i.e., the mean-square radius of gyration at the ϑ point divided by the degree of polymerization) for high-molecular-weight NaPSS was found to be considerably smaller than that for polystyrene in cyclohexane. Data for the intrinsic viscosity [η] in 4.17 M aqueous NaCl at ϑ were analyzed by the theory of Yoshizaki et al. (Macromolecules 1988, 21, 165) for the wormlike chain, a special limit of the helical wormlike chain, to obtain 0.23 (± 0.03), 0.69 (± 0.07), and 1.2 (± 0.1...