HENRY CONSTANTS IN POLYMER-SOLUTIONS WITH THE VAN-DER-WAALS-EQUATION OF STATE

The simple der Waals equation of state, as extended to polymer systems , is applied to the correlation and prediction of Henry constants in p olymer solutions comprising five polymers and many nonpolar and polar solvents, including supercritical gases. The correlation achieved with one adjustable parameter is satisfactory, with typical errors within the experimental uncertainty and comparable to those with the more com plex Perturbed Hard Chain Theory-based equations of state with the sam e number of adjustable parameters. A predictive scheme for calculating Henry constants is also presented, which is a corresponding-states co rrelation for a dimensionless Henry constant defined based on the van der Waals equation of state. Satisfactory results-often close to the o nes from the one-parameter correlation-are obtained for all systems in vestigated in this work. Compared with literature models that have bee n applied to the prediction of Henry constants In polymers, this schem e is simpler and applicable to supercritical gas-containing systems.