LATTICE FLUID THEORY AND INVERSE GAS-CHROMATOGRAPHY IN THE ANALYSIS OF POLYMER-POLYMER INTERACTIONS

In this work, inverse gas chromatography has been used to calculate in teraction energy densities of two polymer blends: poly(epichlorohydrin ) (PECH)/poly(methyl acrylate) (PMA) and poly(hydroxy ether of Bisphen ol A) (phenoxy, PH)/poly(vinyl methyl ether) (PVME) at different tempe ratures. An approach based on the lattice fluid theory has been used i n an attempt to eliminate the well-known probe dependence of the therm odynamic parameters calculated by IGC. In the two polymer blends under study, the above mentioned data analysis seems to be unable to remove the probe dependence. However, it allows the calculation of an averag e characteristic interaction energy density Delta P- which can be use d in the calculation of the interaction energy density B, its enthalpi c and entropic components, and the interaction energy density related to the second derivative of the free energy, B-sc. The thermodynamic p roperties so calculated are in good agreement with those obtained from a phenomenological and simpler data analysis.