Observations on the permeation performance of solvent resistant nanofiltration membranes

For the transport of tetraoctylammonium bromide (TOABr)/toluene mixtures through the PAN/PDMS membrane the phenomena are more complex. The system is non-ideal and no osmotic phenomena are observed. This can be correlated with the formation of ion-pairs of TOABr in toluene. Furthermore, the concentration polarization phenomena are significant resulting in low toluene fluxes and 100% retention of TOABr by the membrane.