Crystalline polymorphism in poly(vinylidenefluoride) membranes |
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| Affiliation: | 1. Department of Energy Engineering, College of Engineering, Hanyang University, Seoul 133-791, Republic of Korea;2. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing Tech University, Nanjing 210009, China;3. Research Institute on Membrane Technology, ITM-CNR, Via PietroBucci 17/C, Rende 87036, Italy;1. College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, Sichuan, People''s Republic of China;2. Institute of Polymer Science and Engineering, Hebei University of Technology, Tianjin 300130, People''s Republic of China;3. Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, OH 44106-7202, USA;1. Department of Chemical and Materials Engineering, Tamkang University, Taipei 25137, Taiwan;2. Energy and Opto-Electronic Materials Research Center, Tamkang University, Taipei 25137, Taiwan;1. Department of Energy Engineering, College of Engineering, Hanyang University, Seoul 133-791, Republic of Korea;2. Solvay Specialty Polymers, R&D Center, Bollate, Italy;3. ITM-CNR, University of Calabria, Italy;1. Matière Molle et Chimie, CNRS UMR-7167 ESPCI Paris, PSL Research University, 10 rue Vauquelin, 75005, Paris, France;2. Xenocs SA, 19, rue François Blumet, 38360, Sassenage, France;3. Piezotech S.A.S., Arkema - CRRA, rue Henri Moissan, 69493, Pierre-Bénite Cedex, France |
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| Abstract: | PVDF is widely employed in membrane processes. Its crystals have five different polymorphs, α, β, γ, δ, and ɛ forms. In the past decades, research has been focused on the properties and performances of PVDF membranes. However, the formation mechanisms of the various polymorphs and their different effects on membrane performance are still not clear. Therefore, overall clarification of, conclusions about, and outlook on the effects of PVDF polymorphism on membrane properties and performance are important topics for further research. This manuscript systematically summarizes the structures and properties of PVDF crystals with different polymorphs, discusses the mechanisms of formation and transformation methods, reviews the crystallization and applications of different PVDF polymorphs in membrane separation, and presents the outlook for applications in membrane operations. |
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| Keywords: | PVDF Polymorphism Membranes Crystallization |
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