A new method for the prediction of diffusion coefficients in poly(ethylene terephthalate)—Validation data

Prediction of the migration is a useful tool in compliance evaluation food contact materials. In our previous work, such prediction model had been established for polyethylene terephthalate (PET), which widely used as packaging material beverages well meat and cheese. Within actual study, 263 diffusion coefficients PET 66 substances at temperatures between 40°C 120°C were determined from permeation kinetic experiments. The DP compared with predicted values by use log/log plot direct comparison coefficients. When applying materials, it mandatory that over-estimative any case. As result, are good agreement experimental results. slightly over-estimates real factor 1.3 average. Reduction molecular volume 20% results an average over-estimation 3 (worst-case). Another finding this study behaviour glass transition temperature not significantly change. applicable below above temperature.