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Crosslinked PVDF-membranes for solvent resistant nanofiltration
- Mertens, Matthias, Van Goethem, Cédric, Thijs, Marloes, Koeckelberghs, Guy, Vankelecom, Ivo F.J.
- Journal of membrane science 2018 v.566 pp. 223-230
- Fourier transform infrared spectroscopy, acetonitrile, artificial membranes, crosslinking, dimethylformamide, drying, ethanol, methanol, nanofiltration, scanning electron microscopy, solutes, solvents, thermoplastics, toluene, transmission electron microscopy, weight loss
- Crosslinked poly(vinylidene difluoride) (PVDF) nanofiltration membranes were prepared and tested for solvent resistant nanofiltration (SRNF) and solvent tolerant nanofiltration (STNF, i.e. in solvent/water media) applications. The performance of the membranes was assessed by filtering ethanol (EtOH), iso-propanol (iPrOH), acetonitrile (ACN), dimethylformamide (DMF) or toluene (Tol) solutions containing Rose Bengal (RB), a 1017 Da solute. During these consecutive filtrations, the membranes displayed a solvent activation effect which was characterised by TEM, ATR-FTIR and via intermediate EtOH filtrations. This solvent activation resulted in a more permeable membrane (by a factor of 11), without loss in retention. Drying the membranes from MeOH resulted in a further increase of the RB retention in ACN and Tol to 98%. The stability of the membranes was characterised using SEM, weight loss analysis and ATR-FTIR. In STNF, a 99% RB retention was achieved from a 1:4 DMF/water mixture.