Barrier Resins
This chapter presents the ability of oxygen barrier resins, polyvinylidene chloride (PVDC), ethylene vinyl alcohol (EVOH), and nylon (PA), to retard the movement of oxygen across layer made of them when different oxygen partial pressures exist on either side of the layer. Polyolefins, especially highly crystalline ones, have a similar ability to retard the movement of water vapor when the partial pressure differences represent relative humidity. The process is quantitatively described at the molecular level and can be quantified in relative terms for flexible packaging materials. Similar molecular interactions are recognized in such effects as slip additive migration, flavor scalping, and extractables from packaging into packaged ...
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