Abstract
Diffusion of water in polymer films has been characterized by using a new high performance and reproducible method based on permeation measurements. With this method, which uses a fast response water-specific sensor based on dew point measurement, it is possible to determine, from the transient step, the time lag water diffusion coefficient DL and, when the steady state is reached, a mean water permeability coefficient P. In this work we have emphasized the water concentration dependence of diffusion coefficient D. After calibration, the technique yields accurate values of P, consistent with literature data. By testing various polymers, different behaviours with respect to water have been observed, particularly with low density polyethylene (LDPE) which shows significant hydrophobic properties.
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