Abstract
It was found that treatment in intense electric fields (i.e., electrical poling) changed the microstructure and filtration performance of polyvinylidene fluoride (PVDF) microfiltration membranes. The effect of temperature, sample size and time on the electrical breakdown of membranes was studied. It was shown that the hydraulic permeability and flux of the membranes can be tuned by changing the poling time. The effect of electrical poling on rejection and molecular weight cutoff was more significant. It was also found that the electrical breakdown of PVDF membranes is a gradual process and a long exposure time to an intense electric field can have adverse effects on the separation performance of the membranes.
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Acknowledgments
We wish to acknowledge the assistance of the staff of AMMRF (Australian Microscopy & Microanalysis Research Facility) at the Electron Microscope Unit of the University of Sydney. We thank Dr. Bogumil Eichstaedt for his help in setting up the electrical poling rig and Sydnovate at Sydney University for financial support for this project. M.T.D acknowledges the support of the University of Sydney and the Australian government through an Endeavour International Postgraduate Research Scholarship (EIPRS).
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Darestani, M.T., Chilcott, T.C. & Coster, H.G.L. Effect of poling time on filtration properties of PVDF membranes treated in intense electric fields. Polym. Bull. 71, 951–964 (2014). https://doi.org/10.1007/s00289-014-1103-8
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DOI: https://doi.org/10.1007/s00289-014-1103-8