Determination of Thermodynamic Interactions of the Pvc-Pmma Blend System by Inverse gas Chromatography

Abstract

In this study, the sorption enthalpy (δH^S1), sorption free energy (δ^G1), sorption entropy (δ^S1), enthalpy, and free energy at infinite dilution (δ^H1 and δ^G1) values were calculated for selected probes such as alcohols, ketones, acetates, cyclic ethers, aromatics, and alkanes in the temperature range 403-433 K for poly(methyl methacrylate) (PMMA), poly(vinyl chloride) (PVC) homopolymers, and the PVC-PMMA blend system. The values of the Flory-Huggins interaction parameters χ1(23) have been calculated in this temperature range and show the importance of specific interactions between the polymers and the solvents. The values of the polymer-polymer interaction parameters χ23(for the temperature range 403–433 K) were found to change from +3.57 to +1.16 for alcohols, from +2.99 to +0.52 for ketones, from + 1.60 to −0.48 for acetates, from +0.96 to −1.46 for cyclic ethers, from +2.66 to +0.12 for aromatics, and from +8.73 to +1.06 for alkanes.