ABSTRACT
Experimental techniques for vapor pressure measurements were reviewed in 1975BON and 2000WOH. Methods and results of the application of IGC to polymers and polymer solutions were reviewed in 1976NES, 1988NES, 1989LLO, 1989VIL, and 1991MU1. Reviews on ebulliometry and/or vapor-pressure osmometry can be found in 1974TOM, 1975GLO, 1987COO, 1991MAY, and 1999PET. VLE-experiments lead either to pressure vs. composition data or to activity vs. composition data. In the low-pressure region, solvent activities, aA, are commonly determined from measured vapor pressures by:
where: aA activity of solvent A BAA second virial coefficient of the pure solvent A at temperature T P system pressure PA partial vapor pressure of the solvent A at temperature T PAs saturation vapor pressure of the pure liquid solvent A at temperature T R gas constant T measuring temperature VAL molar volume of the pure liquid solvent A at temperature T Quite often, the exponential correction term is neglected, and only the ratio of partial pressure to pure solvent vapor pressure, PA/PAs, is given.
