Abstract
The gas permeation technique has been applied to analyse flat polycarbonate nuclear track-etched membranes (TEMs), with pore size smaller than 100 nm. The samples analysed were the commercial membranes Nuclepore and the ones which are being developed at IPEN using the IEA-R1 research reactor (2 MW). A linear trend has been obtained for the flux versus transmembrane pressure for various gases, when measured at a constant temperature of 293 K, indicating a constant permeability for this kind of membranes. Furthermore, the permeability has shown a tendency of increasing when the molecular weight of the gases decreased following the Knudsen model predictions. An estimation of the pore radius for all TEMs were realized using the Knudsen equation and the results obtained were in good agreement with those determined by the SEM technique.
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