A simple procedure for obtaining sorption isotherms from chromatographic peak shapes was applied to poly(vinylidene chloride‐vinylch‐loride 80:20) and poly (vinylidene chloride‐actylonitrile 80:20) surfaces using vinylidene chloride as sorbate. Absolute values of the isosteric heat of adsorption (at constant uptake) increased with decrease in the amount of vinylidene chloride adsorbed, indicating a stronger monomer‐polymer interaction at lower monomer concentrations. Absolute values of Gibb's free energy of adsorption increased with decrease in monomer concentration and temperature, indicating a more favorable monomer‐polymer interaction at low temperatures and monomer concentrations. Data under present experimental conditions correspond to a strong thermodynamic polymer/monomer interaction leading to a substantially limited migration of monomer from a polymeric package into a food contacting medium.
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Demertzis et al. (1987) studied this question.
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