Abstract
The migration of various plastic additives (antioxidants: BHT, Ionox 220, Irgafos 168; UV absorber: Uvinul 3039; plasticizers: TBAC and TOTM) from polypropylene and polylactic acid was investigated in a series of experiments conducted over a period of 13 days. As fatty food simulants, both ethanol 95 v / v % and isooctane were used. Non-Fickian behaviour was observed on multiple occasions. The kinetic curves of both migration concentrations and swelling were evaluated using variography, to determine objectively the starting points of long-lasting plateaus as well as short halts in the increase. A strong correlation between migration and swelling was observed: the kinetic curves showed that migration always followed swelling. Also, more intensive swelling results in the increased migration of the additivies. Consequently, migration testing can be improved by considering the swelling of the plastic. • Migration and swelling kinetics of polylactic acid and polypropylene were studied. • Swelling strongly affects plastic additive migration from food contact materials. • The effect of molecular weight on additive migration can be overruled by plasticizers. • Variography was successfully applied to identify steady-states on kinetic curves.
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