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Mechanism of PVDF Membrane Formation by NIPS Revisited: Effect of Precipitation Bath Nature and Polymer–Solvent Affinity

A new interpretation of the mechanism of the polyvinylidene fluoride (PVDF) membrane formation using the nonsolvent-induced phase separation (NIPS) method based on an analysis of the complete experimental phase diagram for the three-component mixture PVDF–dimethyl acetamide (DMAc)–water is proposed....

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Autores principales: Basko, Andrey, Lebedeva, Tatyana, Yurov, Mikhail, Ilyasova, Anna, Elyashevich, Galina, Lavrentyev, Viktor, Kalmykov, Denis, Volkov, Alexey, Pochivalov, Konstantin
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
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Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10650574/
https://www.ncbi.nlm.nih.gov/pubmed/37959987
http://dx.doi.org/10.3390/polym15214307
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author Basko, Andrey
Lebedeva, Tatyana
Yurov, Mikhail
Ilyasova, Anna
Elyashevich, Galina
Lavrentyev, Viktor
Kalmykov, Denis
Volkov, Alexey
Pochivalov, Konstantin
author_facet Basko, Andrey
Lebedeva, Tatyana
Yurov, Mikhail
Ilyasova, Anna
Elyashevich, Galina
Lavrentyev, Viktor
Kalmykov, Denis
Volkov, Alexey
Pochivalov, Konstantin
author_sort Basko, Andrey
collection PubMed
description A new interpretation of the mechanism of the polyvinylidene fluoride (PVDF) membrane formation using the nonsolvent-induced phase separation (NIPS) method based on an analysis of the complete experimental phase diagram for the three-component mixture PVDF–dimethyl acetamide (DMAc)–water is proposed. The effects of the precipitation bath’s harshness and thermodynamic affinity of the polymer’s solvent on the morphology, crystalline structure, transport and physical–mechanical properties of the membranes are investigated. These characteristics were studied via scanning electron microscopy, wide-angle X-ray scattering, liquid–liquid porosimetry and standard methods of physico-mechanical analysis. It is established that an increase in DMAc concentration in the precipitation bath results in the growth of mean pore size from ~60 to ~150 nm and an increase in permeance from ~2.8 to ~8 L m(−2) h(−1) bar(−1). It was observed that pore size transformations are accompanied by changes in the tensile strength of membranes from ~9 to ~11 and to 6 MPa, which were explained by the degeneration of finger-like pores and appearance of spherulitic structures in the samples. The addition of water to the dope solution decreased both the transport (mean pore size changed from ~55 to ~25 nm and permeance reduced from ~2.8 to ~0.5 L m(−2) h(−1) bar(−1)) and mechanical properties of the membranes (tensile strength decreased from ~9 to ~6 MPa). It is possible to conclude that the best membrane quality may be reached using pure DMAc as a solvent and a precipitation bath containing 10–30% wt. of DMAc, in addition to water.
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spelling pubmed-106505742023-11-02 Mechanism of PVDF Membrane Formation by NIPS Revisited: Effect of Precipitation Bath Nature and Polymer–Solvent Affinity Basko, Andrey Lebedeva, Tatyana Yurov, Mikhail Ilyasova, Anna Elyashevich, Galina Lavrentyev, Viktor Kalmykov, Denis Volkov, Alexey Pochivalov, Konstantin Polymers (Basel) Article A new interpretation of the mechanism of the polyvinylidene fluoride (PVDF) membrane formation using the nonsolvent-induced phase separation (NIPS) method based on an analysis of the complete experimental phase diagram for the three-component mixture PVDF–dimethyl acetamide (DMAc)–water is proposed. The effects of the precipitation bath’s harshness and thermodynamic affinity of the polymer’s solvent on the morphology, crystalline structure, transport and physical–mechanical properties of the membranes are investigated. These characteristics were studied via scanning electron microscopy, wide-angle X-ray scattering, liquid–liquid porosimetry and standard methods of physico-mechanical analysis. It is established that an increase in DMAc concentration in the precipitation bath results in the growth of mean pore size from ~60 to ~150 nm and an increase in permeance from ~2.8 to ~8 L m(−2) h(−1) bar(−1). It was observed that pore size transformations are accompanied by changes in the tensile strength of membranes from ~9 to ~11 and to 6 MPa, which were explained by the degeneration of finger-like pores and appearance of spherulitic structures in the samples. The addition of water to the dope solution decreased both the transport (mean pore size changed from ~55 to ~25 nm and permeance reduced from ~2.8 to ~0.5 L m(−2) h(−1) bar(−1)) and mechanical properties of the membranes (tensile strength decreased from ~9 to ~6 MPa). It is possible to conclude that the best membrane quality may be reached using pure DMAc as a solvent and a precipitation bath containing 10–30% wt. of DMAc, in addition to water. MDPI 2023-11-02 /pmc/articles/PMC10650574/ /pubmed/37959987 http://dx.doi.org/10.3390/polym15214307 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Basko, Andrey
Lebedeva, Tatyana
Yurov, Mikhail
Ilyasova, Anna
Elyashevich, Galina
Lavrentyev, Viktor
Kalmykov, Denis
Volkov, Alexey
Pochivalov, Konstantin
Mechanism of PVDF Membrane Formation by NIPS Revisited: Effect of Precipitation Bath Nature and Polymer–Solvent Affinity
title Mechanism of PVDF Membrane Formation by NIPS Revisited: Effect of Precipitation Bath Nature and Polymer–Solvent Affinity
title_full Mechanism of PVDF Membrane Formation by NIPS Revisited: Effect of Precipitation Bath Nature and Polymer–Solvent Affinity
title_fullStr Mechanism of PVDF Membrane Formation by NIPS Revisited: Effect of Precipitation Bath Nature and Polymer–Solvent Affinity
title_full_unstemmed Mechanism of PVDF Membrane Formation by NIPS Revisited: Effect of Precipitation Bath Nature and Polymer–Solvent Affinity
title_short Mechanism of PVDF Membrane Formation by NIPS Revisited: Effect of Precipitation Bath Nature and Polymer–Solvent Affinity
title_sort mechanism of pvdf membrane formation by nips revisited: effect of precipitation bath nature and polymer–solvent affinity
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10650574/
https://www.ncbi.nlm.nih.gov/pubmed/37959987
http://dx.doi.org/10.3390/polym15214307
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