Investigation of Thermodynamic Properties of PIBMA-PVC (50%/50%) and P-4-t-BS-PVC (50%/50%) Blends Systems by Inverse Gas Chromatography

Abstract

ABSTRACT The specific retention volumes, , values of the poly (isobutyl methacrylate)-poly (vinyl chloride) (PIBMA-PVC) (50%/50%) and poly (-4-tert-butyl styrene)-poly (vinyl chloride) (P-4-t-BS-PVC) (50%/50%) blends-probe systems were calculated between 383 and 423 K by inverse gas chromatography technique. According to these data, the thermodynamic properties such as the sorption enthalpy (), sorption free energy (), sorption entropy (), the partial molar free energy (), and the partial molar heat of mixing, () at infinite dilution were determined for the interactions of (PIBMA-PVC) (50%/50%) and (P-4-t-BS-PVC) (50%/50%) blends with alcohols and aromatics and CHCl3 by inverse gas chromatography method in the temperature range of 383–423 K. The sorption values and values were observed to be exothermic, and , , and values were observed to be endothermic. The values of PIBMA-PVC (50%/50%) and P (-4-t-BS)-PVC (50%/50%) blends-alcohols systems changed from 9.73 to 18.17 kJ/mol and from 10.00 to 16.83 kJ/mol, respectively. Flory-Huggins interaction parameters, χ12, χ13, χ14, χ1(23) and χ1(24) values of PVC, PIBMA, P (4-t-BS), PIBMA-PVC (50%/50%) and P (-4-t-BS)-PVC (50%/50%) blend systems were determined at 413–423 K. In addition, χ23′ and χ24′ values of alcohols changed from 1.191 to 2.473 and from 1.342 to 1.839 for PIBMA-PVC (50%/50%) and P (-4-t-BS)-PVC (50%/50%) blends, respectively, at 413 K.