Study of gas permeation for asymmetric track-etched polymer blends

Polymer blends of polycarbonate (PC) and polysulphone (PSF) having thickness 27 μ m are prepared in different concentration (1:0), (1:1) and (1:3) by solution cast method. It was found that, as the concentration of PSF in blends increases, the permeability of hydrogen and carbon dioxide decreases. The membranes were irradiated by Ni 7 + ion of 100 MeV. Gas permeability of hydrogen and carbon dioxide was measured for the irradiated samples, permeability for the both gases increases with increases etching time. Permeability from ion incidence side is higher than the permeability from ion emergence side. This difference in permeability from both the sides is attributed to the conical shape of the track generated by ions, which shows asymmetrical behaviour of tracks created in membranes. Permselectivity of hydrogen over carbon dioxide also increases with increasing PSF concentration from both the sides and it found maximum for 1:3 (PC:PSF) track-etched membrane.