Dynamic viscoelasticity of dilute polyelectrolyte solutions

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Abstract
Dynamic storage and loss moduli of dilute solutions of linear poly(2‐vinylpyridine) with molecular weights ranging from 3.0×104 to 1.0×106 have been measured under conditions where the polymer can be charged by protonation. A pronounced maximum is exhibited in the reduced moduli occurring at a concentration which is independent of molecular weight and measurement frequency. No change in the polyion hydrodynamic interaction upon dilution is observed, as determined from Zimm model fits of the reduced modulus vs frequency at finite polymer concentrations. The origin of the viscoelasticity maximum is explained in terms of an electrostatically driven polyion coil expansion and contraction resulting in the scaling of the relaxation spectrum by the longest relaxation time τ1.

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