Oxygen mass transfer rates were analyzed at 25?C using a Mocon OX-Tran2/20 (Mocon Inc., USA) based on the ASTM 3985 standard method. Test cell was composed by two chambers sepa-
rated by the sample (10 cm2). On one side of the film 100% oxygen gaswas flowing, andon the other side there is a flow of nitrogen gas (98% N2and 2% H2). The RH of both gases was controlled at 75% by a
humidifier. All barrier properties were determined at least by triplicate.