Abstract
The vapor pressure of poly(4-hydroxystyrene)+acetone is measured between 298.15 and 318.15 K and for 0.35≤ω 1 ≤0.89, ω 1 being the weight fraction of acetone. The Flory-Huggins χ parameter has been calculated and found to increase with increasing ω 1 . A thermodynamic consistency test has been developed, and the data have been found to satisfy it. The local composition in the mixture has been discussed in terms of the Kirkwood-Buff-Zimm integrals and found to differ significantly from the bulk composition. Finally, a rigid-lattice model that incorporates the local composition concept has been tested
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