Hydrodynamic properties of polyelectrolytes. Part I. Poly‐4‐vinyl‐N‐n‐butylpyridinium bromide

Abstract

The viscosity, streaming birefringence, and sedimentation of a sample of poly‐4‐vinyl‐N‐n‐butylpyridinium bromide have been measured in aqueous and in sodium chloride solutions. The theory of Peterlin for concentrated solutions has been found to be in agreement with the results. Values of the molecular weight have been calculated by different methods and a value of 9 × 105 has been chosen.

Relative viscosity and concentration

“…For polyelectrolytes (74) at decreasing concentrations the same rising of the Z-value, after a minimum, has been observed, to reach a maximum at very low concentration, e. g. 0.0001 (0.01% dry substance), followed again by a decrease (75,76,77). The increase of Z has been ascribed by Fuoss (78,79) again to uncoiling of the polyions, this changing the shape and /c-value.…”

Ion-specific effect on dynamics of polyelectrolyte chains

“…[24][25][26][27] Yet, its behavior remains elusive though some attempts have been made in the past years. 1,[28][29][30][31][32] Theoretically, the dynamics of QPVP is determined by hydrophobicity, effective charge and specific ion effect. 33,34 Experimentally, it is reported that the viscosity of QPVP solution is significantly influenced by its concentration and molar mass as well as the concentration of the added salts, and the overlap concentration depends on its molar mass and charge density.…”