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

Abstract

An equation for the total sorption potential Y derived from the modified Flory-Huggins equation and containing concentration-dependent interaction parameters, including the ternary parameter ,yT, 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, g,, , 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 g,, 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.

Metastable liquid-liquid and solid-liquid phase boundaries in polymer-solvent-nonsolvent systems

“…v u indicates the molar standing of these complex systems. Furthermore the Flory-Huggins theory can provide qualitative volume of a repeat unit of the polymer and DH 30,31 parameter can be regarded as a measure for the thermodynamic driving force for crystallization of the polymer:…”

Quantitative Evaluation of the Swelling and Crosslinking Degrees in Two Organic Gel Packings for SEC

“…and taking into account the following equivalencies between the Flory interaction parameters, v ij , and those concentration dependent, g ij , [27,28,31,32] ð8Þ…”

Association Equilibria Theory for Polymers in Mixed Solvents with Specific Interactions

“…[11][12][13] In this contribution, we focus our attention on a quantitative interpretation of sorption equilibrium in ternary polymeric systems (TPS), which has been undertaken in light of the Flory-Huggins formalism, as generalized by Pouchlý (FHP), and of Flory-Prigogine-Patterson (FPP) theory. Experimental dependences on solvent-mixture composition of preferential, l, and total, Y, sorption coefficients are smaller than those expected from FH formalism, [14,15] but the deviations could be explained by introducing ternary interaction parameters, as done in FHP formalism. Although the found relationships between ternary and the corresponding binary parameters has been ascertained both phenomenologically and semiempirically for polymer-mixed-solvent [16][17][18][19] and polymer blends in solution, [20][21][22] the physical origin of the above deviations could be explained by more advanced theories such as the FPP one.…”

“…[42] Likewise, Molineux and Vekavakayanondha, when studying interactions between PVP and diverse phenols, [35] observe a decrease in the relative amount of active sites occupied by phenols with decreasing M of the polymers. On the other hand, however, the later authors, as well as most others, [14,15,43,44] recognize the negligible influence of M on l values. It also happens in the systems studied here, as shown later.…”

“…In FHP formalism, [15] A 2 depends on Àw 13 f 1 À sw 23 f 2 whereas, in the present one, A 2 is a function of Àg and that w 13 ¼ g 0 13 , as it was assumed in an initial approach. There is no coincidence, however, in the expected dependences on the above parameters of l's derived from both formalisms.…”