MIGRATION OF INDIRECT, FOOD ADDITIVES: A PHYSICAL CHEMICAL APPROACH

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Abstract
Active site binding of vinyl chloride monomer by polyvinyl chloride has been demonstrated in 2 of 3 unplasticized resins, by equilibrium partitioning studies. The magnitude of this effect was less than what was observed in previous studies. The potential for active site binding to be a limiting, factor for the migration of indirect food additives may thus depend upon chemical and morphological features of the particular resin used to manufacture the food contact article. Inverse phase gas‐solid chromatographic studies have also shown active site binding in the unplasticized resin sample studied by this method. Simple dissolution was shown to be the predominant mode of monomer/polymer interaction, for the plasticized counterpart of this resin. These studies have shown the potential for obtaining reliable data for interaction of polymer resins with indirect food additive type molecules by this more quickly performed technique.