Influence of support layer and PDMS coating conditions on composite membrane performance for ethanol/water separation by pervaporation

Parimal V Naik; Roy Bernstein; Ivo F. J Vankelecom

doi:10.1002/app.43670

journal article Apr 14, 2016

Influence of support layer and PDMS coating conditions on composite membrane performance for ethanol/water separation by pervaporation

Parimal V Naik Roy Bernstein Ivo F. J Vankelecom

Journal of Applied Polymer Science Vol. 133 No. 28 · Wiley

View at Publisher Save 10.1002/app.43670

Abstract

ABSTRACTA systematic study was performed on the combination of support properties and polydimethylsiloxane (PDMS) coating conditions for the lab‐scale preparation of a defect‐free, thin film composite membrane for organophilic pervaporation. Support layers having comparable surface porosities were prepared from three polymers with different chemical composition (PVDF, PSF, PI). Their exact role on the deposition of the PDMS coating (i.e., wetting and intrusion) and the final membrane performance (i.e., effect on mass transfer of the permeants) was studied. The crosslinking behavior of dilute PDMS solutions was studied by viscosity measurements to optimize the coating layer thickness, support intrusion and wetting. It was found essential to pre‐crosslink the PDMS solution for a certain time prior to the coating. Dip time for coating the PDMS solution on the supports was varied by using automated dip coating machine. The performance of the synthesized membranes was tested in the separation of ethanol/water mixtures by pervaporation. Both flux and selectivity of the membranes were clearly influenced by the support layer. Resistance of the support layers increased by increasing the polymer concentration in the casting solutions of the supports. Increasing the dip time of the PDMS coating solution led to increased selectivity of the composite membranes. Scanning Electron Microscopy analysis of the composite membranes showed that this leads to a minor increase in the thickness of the PDMS top layer. Top layer thickness increased linearly with the square root of the dip time (t0.5) at a constant withdrawal speed of the support. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43670.

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Metrics

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Citations

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References

Details

Published: Apr 14, 2016
Vol/Issue: 133(28)
License: View

Authors

P

Parimal V Naik

Centre for Surface Chemistry and Catalysis, Faculty of Bioengineering Sciences KU Leuven, Kasteelpark Arenberg 23, PO Box 2461 Leuven 3001 Belgium

R

Roy Bernstein

Centre for Surface Chemistry and Catalysis, Faculty of Bioengineering Sciences KU Leuven, Kasteelpark Arenberg 23, PO Box 2461 Leuven 3001 Belgium

I

Ivo F. J Vankelecom

Centre for Surface Chemistry and Catalysis, Faculty of Bioengineering Sciences KU Leuven, Kasteelpark Arenberg 23, PO Box 2461 Leuven 3001 Belgium

Funding

KU Leuven Award: IOFKP/10/002 and OT 11/061

FWO

Belgian Government (IAP-PAI networking), the Flemish Government (Methusalem (CASAS)

Cite This Article

Parimal V Naik, Roy Bernstein, Ivo F. J Vankelecom (2016). Influence of support layer and PDMS coating conditions on composite membrane performance for ethanol/water separation by pervaporation. Journal of Applied Polymer Science, 133(28). https://doi.org/10.1002/app.43670

Influence of support layer and PDMS coating conditions on composite membrane performance for ethanol/water separation by pervaporation

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