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Features of rheological behavior of aqueous solutions of poly(N, N-dimethyldiallylammonium chloride)

Rheological properties of concentrated polyelectrolyte solutions were studied using two samples of poly(N,N-dimethyldiallylammonium chloride) with different molecular masses. No anomalies in the viscosity behavior were observed in a broad range of concentrations, temperatures, and ionic solution strengths. The activation energies E a of viscous flow were calculated for various solution concentrations and a concentration region featuring a change in the mechanism of mass transfer and the formation of a fluctuation network of entanglements was determined with the aid of a scaling approach. It was found that this region, independent of the molecular mass of polyelectrolyte, is situated significantly above the crossover concentration determined using the inverse intrinsic viscosities and is essentially the region of concentrations corresponding to the screening of electrostatic interactions between macromolecular segments. In the presence of a low-molecular-mass electrolyte, the screening concentration decreases somewhat and the strength of the fluctuation entanglement network increases.