On the infrared spectroscopic determination of self- and interassociation equilibrium constants used in the prediction of the phase behavior of hydrogen bonded polymer blends

Abstract

Full Paper: We have previously shown that if chain connectivity effects are taken into account equilibrium constants determined from appropriate low molar mass mixtures can be used to predict the phase behavior of analogous hydrogen bonded polymer blends. Infrared spectroscopy has been classically used to determine appropriate self- and interassociation equilibrium constant values, but the particular methodology used has to be carefully considered on a case by case basis. Here we report on and compare the results of studies of very dilute cyclohexane solutions of 4-ethylphenol, ethyl isobutyrate, and dibenzyl ether, in both the hydroxyl and carbonyl stretching region of the infrared spectrum.