Abstract
The permeability and selectivity of styrene-grafted and sulphonated PTFE membranes towards binary mixtures of water and glycerol were studied. The swelling of the membrane shows maxima at an intermediate concentration of the mixture and increases with increasing sulphonation. The permeating flow, ø, increases with the amount of sulphonic groups in the membrane, while the selectivity, α, only changes slightly with sulphonation. Both ø and α decrease with increasing glycerol concentration in the feed mixture. A strong increase of both α and ø values with temperature was observed, mainly due to increased diffusion of water through the membrane.
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