Abstract
Solvent activity measurements have been performed on the system poly(ethylene glycol) 400 (PEG400) + ethanol at T = (298.15 to 328.15) K using an improved isopiestic method. The solvent activity data were correlated with the original and modified Flory–Huggins models. The density, speed of sound, and viscosity data were also measured at T = (288.15 to 328.15) K for the PEG400 + ethanol system. From these experimental data, the excess molar volume, VE, excess molar isentropic compression, KEs,m, and viscosity deviation, Δη, have been determined for each composition and fitted to the Redlich–Kister equation.
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