Models for the Migration of Low Molecular Weight Additives in Polyolefins

摘要

Food Packaging is an important encounter in the daily life. The low molecular weight components in the packaging materials may migrate into the foods. This program, sponsored by the Bureau of Foods of the Food and Drug Administration, tends to provide theoretical models, reliable data base, and methodology to study the migration phenomena and to provide reasonable worst-case estimates for the concentrations of the indirect additives in food. In this annual report the authors present a relationship of diffusion coefficients of gaseous diffusants in polyolefins based on free volume theory, procedures and results of inverse gas chromatography for migrant-polymer interaction parameters and diffusivities of oligomers in polyethylene, methods and preliminary results of spectrofluorimetry on the migration of antioxidants in polyethylene, results and correlations of extraction experiments with radioactive labeled migrants. It was found that anhydrous ethanol and lower numbers of pure triglycerides can successfully simulate the extractive behavior of food oils. The accelerating action of n-heptane over that of the food oil is quantified.