Abstract
AbstractThe viscosity of dilute aqueous solutions of polyelectrolytes has been reinvestigated with the help of an improved model of a rotation viscometer with electrostatic restoring torque recently described. The experimental variables included rate of shear, composition of the medium, concentration, and degree of polymerization of the solutes. The limiting slopes of the viscosity numbers of polymethacrylic acid as a function of the rate of shear have been found to be horizontal, in accord with hydrodynamic theory. The limiting viscosity numbers of fractions of polymethacrylic acid, poly vinylpyridiniumbutyl bromide and sodiumcarboxy methylcellulose are analyzed. A discussion of experimental methods used for the study of rate of shear dependence of the viscosity of polyelectrolytes is given.
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