Rheological Properties and Structure of Aqueous Solutions of Polysaccharides. Solutions of Mixtures of Sodium Carboxymethylcellulose Fractions of Different Molar Mass

Abstract

Rigorous relations are proposed for calculating the additive values of activation parameters of viscous flow of solutions of polymer mixtures. The point of view that the cause of deviation of the viscosity of solutions of Na-CMC fractions of the same chemical composition but significantly different molar mass from the additive values is the formation of a supermolecular structure common to the components in a binary solution, and the outlays for breaking it up during flow are not compensated by changes in the entropy of the decomposed system. Experimental data are obtained that indicate a correlation between the strength indexes of films dry spun from solutions of Na-CMC fraction mixtures of different molar mass and the excess enthalpy of activation of viscous flow of these solutions.