Partition Coefficient and Activity Coefficient Determinations of Pinenes in Polypropylene Sebacate and of Halocarbons in Silicone Oil Using Gas/Liquid Chromatographic Techniques

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Abstract
A commercial dual-channel chromatograph was modified to enable the partition coefficients and activity coefficients of various solutes in polymer stationary phases to be measured at finite concentrations of the solute. The technique chosen was “Elution on a Plateau” in which the chromatographic column is first equilibrated by a carrier gas (nitrogen) containing the solute vapor. The partition coefficient of the solute is then calculated by measuring the elution volume of a small sample of the solute injected. Activity coefficients were calculated from the partition coefficients by using the known molecular weights of the solutes and the stationary phases and the vapor pressures of the solutes. For the binary systems, the activity coefficients were correlated by means of the single and two-parameter Flory-Huggins Equation, the parameters being evaluated in this work. In each case the fit was very good, suggesting that this equation is adequate in describing the behavior of these polymer solutions where polar interactions are small or non-existent.

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