TY - JOUR

T1 - Conformations of Sodium Poly(styrene-4-sulfonate) Macromolecules in Solutions with Different Ionic Strengths

AU - Pavlov, G.M.

AU - Gubarev, A.S.

AU - Gavrilova, I.I.

AU - Panarin, E.F.

PY - 2011

Y1 - 2011

N2 - Translational friction and viscosity of dilute solutions of sodium poly(styrene-4-sulfonate) with molecular masses of M = (5 × 10^4)–(85 × 10^4) are studied at different concentrations of low-molecular mass salts. Molecular masses of the polymer are determined from the sedimentation-diffusion data. The study of the correlation between molecular masses and hydrodynamic characteristics resulted in ascertainment of the Kuhn–Mark–Houwink–Sakurada relationships for salt-free aqueous solutions of the polymer and solutions of the polymer in 0.2 M NaCl, 4.17 M NaCl, and 1.0 M KCl. It is shown that, as the ionic strengths of solutions are varied from minimum (H2O) to maximum (4.17 M), macromolecules of the strong polyelectrolyte sodium poly(styrene-4-sulfonate) change their conformations from rigid rods to coils and, then, approach a globular conformation. In terms of the Gray–Bloomfield–Hearst and Yamakawa–Fujii theories and within the framework of the weakly bent cylinder model, the statistical Kuhn segment length a

AB - Translational friction and viscosity of dilute solutions of sodium poly(styrene-4-sulfonate) with molecular masses of M = (5 × 10^4)–(85 × 10^4) are studied at different concentrations of low-molecular mass salts. Molecular masses of the polymer are determined from the sedimentation-diffusion data. The study of the correlation between molecular masses and hydrodynamic characteristics resulted in ascertainment of the Kuhn–Mark–Houwink–Sakurada relationships for salt-free aqueous solutions of the polymer and solutions of the polymer in 0.2 M NaCl, 4.17 M NaCl, and 1.0 M KCl. It is shown that, as the ionic strengths of solutions are varied from minimum (H2O) to maximum (4.17 M), macromolecules of the strong polyelectrolyte sodium poly(styrene-4-sulfonate) change their conformations from rigid rods to coils and, then, approach a globular conformation. In terms of the Gray–Bloomfield–Hearst and Yamakawa–Fujii theories and within the framework of the weakly bent cylinder model, the statistical Kuhn segment length a

U2 - 10.1134/S0965545X11110095

DO - 10.1134/S0965545X11110095

M3 - Article

VL - 53

SP - 1003

EP - 1011

JO - Polymer Science - Series A

JF - Polymer Science - Series A

SN - 0965-545X

IS - 11

ER -