Abstract
Inverse Gas Chromatography (IGC) was used to construct sorption isotherms of acrylonitrile (ACN) on an acrylonitrile-styrene copolymer. The absolute value of the isosteric heat of adsorption (at constant uptake) increased with decrease in the amount of ACN adsorbed, indicating a stronger monomer-polymer interaction at the lower monomer concentrations. The Gibbs free energy obtained from the partition coefficients, as calculated from the ratio of monomer concentrations in the stationary and moving phases, was of the same order of magnitude as the values obtained from the specific retention volumes. The absolute value of this energy increased with decrease in monomer concentration and temperature, indicating a more favourable monomer-polymer interaction at the low temperatures and monomer concentrations.
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