Development of an experimental technique to assess the permeability of metal coated polymer films
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The experimental time required to measure water vapour permeability of barrier film using the cup method is extremely long. In this study, a new technique is proposed, based on light transmission. This fast and accurate method was first validated using model films constituted of aluminized PET (polyethylene terephthalate) with aluminium layers of different thicknesses (<100 nm). It was possible to show that the ‘illuminating’ method could advantageously be employed to control the film’s barrier properties during their fabrication. In a second step, the method was tentatively used to measure the changes in barrier properties over time, when the samples are submitted to severe hydrothermal ageing (70 °C, 90% relative humidity [RH]). It was concluded that the complex degradation mechanism prevents accurate measurement while ageing.
KeywordsAgeing Time Barrier Property Water Vapour Permeance Water Vapour Transmission Rate Inorganic Layer
This work was partly financed by ANR (French Agence Nationale de la Recherche) through the BARISOL Prebat Project overviewed by ADEME (Agence De l’Environnement et de la Maîtrise de l’Energie, French Agency for Environment and Energy Management). We specially thank Francine Roussel-Dherbey of CMTC, Consortium des Moyens Technologiques Communs (38, France), for technical support with SEM images and François Dominique Menneteau of CSTB (38, France), for technical support with permeability cup measurements.
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