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Polymers 2019, 11(3), 463; https://doi.org/10.3390/polym11030463

Parameter Screening of PVDF/PVP Multi-Channel Capillary Membranes

1
Department of Environmental, Process & Energy Engineering, MCI—The Entrepreneurial School, Maximilianstrasse 2, 6020 Innsbruck, Austria
2
Institute of Physical Chemistry, University of Innsbruck, Innrain 52c, 6020 Innsbruck, Austria
*
Author to whom correspondence should be addressed.
Received: 25 January 2019 / Revised: 14 February 2019 / Accepted: 6 March 2019 / Published: 11 March 2019
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Abstract

The increasing research in the field of polymeric multi-channel membranes has shown that their mechanical stability is beneficial for a wide range of applications. The more complex interplay of formation process parameters compared to a single-channel geometry makes an investigation using Design of Experiments (DoE) appealing. In this study, seven-channel capillary membranes were fabricated in a steam–dry–wet spinning process, while varying the composition of the polymer solution and the process temperatures in a three-level fractional factorial linear screening design. The polymers polyvinylidene flouride (PVDF) was the chemically resistant main polymer and polyvinylpyrrolidone (PVP) was added as hydrophilic co-polymer. Scanning electron microscopy and atomic force microscopy were applied to study the membrane morphology. Fabrication process conditions were established to yield PVDF/PVP multi-channel membranes, which reached from high flux (permeability P = 321.4 L / m 2 / h /bar, dextran 500 kDa retention R = 18.3%) to high retention (P = 66.8 L / m 2 / h /bar, R = 80.0%). The concentration of the main polymer PVDF and the molecular weight of the co-polymer PVP showed linear relations with both P and R. The permeability could be increased using sodium hypochlorite post-treatment, although retention was slightly compromised. The obtained membranes may be suitable for micro- or ultra-filtration and, at the same time, demonstrate the merits and limitations of DoE for multi-channel membrane screening. View Full-Text
Keywords: multi-channel membrane; PVDF/PVP membrane; phase inversion process; design of experiments multi-channel membrane; PVDF/PVP membrane; phase inversion process; design of experiments
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Back, J.O.; Brandstätter, R.; Spruck, M.; Koch, M.; Penner, S.; Rupprich, M. Parameter Screening of PVDF/PVP Multi-Channel Capillary Membranes. Polymers 2019, 11, 463.

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