Isopiestic Determination of 2-Propanol Activity in 2-Propanol + Poly(ethylene glycol) Solutions at 25 °C

Abstract

The activities of 2-propanol in poly(ethylene glycol) (PEG) (M n: 1000, 300, 200) + 2-propanol solutions have been measured by the isopiestic method at 25 °C. Sodium iodide was used as the isopiestic standard for the calculation of activities. The original equation of Flory−Huggins and the modified Flory−Huggins equation with concentration dependent interaction parameters have been used for the correlation of obtained experimental solvent activity data. Better agreement with the experimental data was obtained using the modified Flory−Huggins equation.

Determination of Solvent Activity in Poly(vinylpyrolidone) + Methanol, + Ethanol, + 2-Propanol, + and 1-Butanol Solutions at 25 °C

“…Although there is some VLE data for aqueous solutions of PVP in the literature, for its nonaqueous solutions there are no activity data in the literature. This work is a continuation of our study 2,3 on the thermodynamics of polymer + solvent systems. In the present report, activities of methanol, ethanol, 2-propanol, and 1-butanol in solutions of PVP (M w ) 10 000) are measured by the improved isopiestic method at 25 °C.…”

Vapor−Liquid Equilibria, Density, and Speed of Sound for the System Poly(ethylene glycol) 400 + Methanol at Different Temperatures

“…In their vapor sorption measurements, 8 however, they only considered the methanol and ethanol mass fractions in the limited ranges of 0.0143 to 0.3385 and 0.0298 to 0.3827, respectively. There are also vapor pressure or activity data for PEG + 2-propanol 9 with different molar mass of PEG. However, as far as we know there is no vapor pressure or activity data for the PEG400 + methanol system at different temperatures in the literature.…”

Influence of molar mass of polymer on the solvent activity for binary system of poly N-vinylcaprolactam and water

“…Equality of the solvent chemical potential implies the equality of the solvent activity. The isopiestic apparatus used in this work is similar to the one used by others [17]. This apparatus consisted of a five-leg manifold attached to round-bottom flasks.…”

“…where d = D(T) at a constant T. Thus, at a constant-temperature, the modified Flory-Huggins equation proposed by Bae et al takes the following form [9,23,17] ln…”