SELECTIVE CAPILLARY DIFFUSION OF EQUIMOLAR H-2 D-2 GAS-MIXTURES THROUGH ETCHED ION TRACK MEMBRANES PREPARED FROM POLYETHYLENE TEREPHTHALATEAND POLYIMIDE/

The selective capillary diffusion of equimolar H-2/D-2 gas mixtures th rough ion track membranes prepared from polyethylene terephthalate and polyimide was investigated at a temperature of 293 K, a primary press ure of 0.15 MPa and a secondary pressure of 10(-4) MPa, Different valu es of the separation factor Z(H-2/D-2) between experiment and computer simulation exists in the case of polyethylene terephthalate ion track membranes because of multiple pores. Membranes for which multiple por es were reduced by varying the irradiation angle showed an increased s eparation factor. The separation factor is a function of the pore diam eter, This is shown for polyimide ion track membranes with a pore size in the range of 0.17 and 0.5 mu m, After grafting with styrene the se paration factor increased, indicating grafting within the pores.