Correlation of data on intrinsic viscosities in mixed solvents by means of the modified flory‐huggins equation

Abstract

AbstractAn equation for the total sorption potential Y derived from the modified Flory‐Huggins equation and containing concentration‐dependent interaction parameters, including the ternary parameter χT, was used to correlate reported data on intrinsic viscosities in mixed solvents. Similarly to the evaluation of data on preferential sorption, the assumption of proportionality between the ternary parameter and the interaction parameter of components of the mixed solvent, g12, was successfully applied to the case of total sorption. The assumption proved to be useful in the treatment of 12 ternary systems, if the single‐liquid approximation was employed. The calculated proportionality constant between the ternary parameter and g12 has properties similar to that evaluated from the data on preferential sorption. The conditions of occurrence of a maximum or minimum in the dependence of total sorption on composition are discussed.