Revisit to the intrinsic viscosity-molecular weight relationship of ionic polymers. 3. Viscosity behavior of ionic polymer latices in ethylene glycol/water mixtures

Abstract

The reduced viscosity of aqueous and ethylene glycol (EG)/water suspensions of ionic latex particles was measured in the presence and absence of a simple salt. The viscosity showed substantial shearthinning effects in both the water and binary systems. The reduced viscosity was generally much higher than the Einstein prediction and increased with increasing volume fraction of latex ( ). The viscosity decreased with increasing salt concentration. In the binary solvents the viscosity decreased with increasing EG content (up to 60%). The fraction of free counterions (H+) was found to decrease, though slightly, with increasing EG content. This was also confirmed by the mobility measurements. We critically examined existing interpretations of the concentration dependence of the reduced viscosity. It was demonstrated that there exists no direct correlation between the Debye length and the reduced viscosity. Furthermore, the possibility was recalled that, in low-salt macroionic and colloidal solutions, the Debye length loses its physical meanings as originally found for simple ionic systems. The intrinsic viscosity in water and binary solvents containing lChMO"6 M KC1 was in good agreement with that calculated by Booth's theory on the first-order electroviscous effect, while the agreement was not satisfactory at much lower KC1 concentrations.

Revisit to the intrinsic viscosity-molecular weight relationship of ionic polymers. 5. Further studies on solution viscosity of sodium poly(styrenesulfonates)

“…L was obtained from Mo and the molecular weight of the polymer. The relaxation time was related to the rotational diffusion constant (DI01) by t = 1/6 DI0t (2) and DI0t for the rigid rod is given by DTOt = 3kT In (L/b)/VoL3 (3) where k is the Boltzmann constant, T is the absolute temperature, and tjo is the solvent viscosity.11…”

Rheological behavior of N,N‐dimethyl acrylamide–acrylamido methylpropane sulphonate copolymer

“…However, this is not observed, the reduced viscosity in EtOH is greater than that in EG solution. For polyeletrolytes, solution viscosity is greatly influenced by the overall ionic strength and polyion concentration 15 of the solution (i.e., polyion-counterion and polyion-polyion electrostatic interactions). Dielectric constants of solvents and specific conductance of the polymer solution in different solvents are presented in Table II.…”

Monte Carlo Simulations of a Single Polyelectrolyte in Solution: Activity Coefficients of the Simple Ions and Application to Viscosity Measurements

“…N(e κb + e -κb -2) ) (14) as well have used the continuous line-charge limit, which turns eq 14 into the simplified expression where Rc p represents the concentration of counterions from the polyelectrolyte.…”

“…As we will see, the answer is yes, but it should be pointed out that it does not prove that the intramolecular interactions are the main cause of the polyelectrolyte effect. The intermolecular interactions may also stay constant, and there are strong indications that these are largely responsible for the effect. ,− For example, latices, , telechelic ionomers with a charge at just one end, and spherical poly(styrene sulfonate) particles 17 all have a more or less fixed size but can still display a behavior similar to that of flexible polyelectrolytes, which points toward an explanation in terms of intermolecular interactions.…”