Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.memsci.2009.05.029
Title: Molecular elucidation of morphology and mechanical properties of PVDF hollow fiber membranes from aspects of phase inversion, crystallization and rheology
Authors: Sukitpaneenit, P.
Chung, T.-S. 
Keywords: Mechanical properties
Membrane morphology
Non-solvent additives
PVDF hollow fiber membranes
Rheological properties
Issue Date: 15-Sep-2009
Source: Sukitpaneenit, P., Chung, T.-S. (2009-09-15). Molecular elucidation of morphology and mechanical properties of PVDF hollow fiber membranes from aspects of phase inversion, crystallization and rheology. Journal of Membrane Science 340 (1-2) : 192-205. ScholarBank@NUS Repository. https://doi.org/10.1016/j.memsci.2009.05.029
Abstract: This study explores the fundamental science of fabricating poly(vinylidene fluoride) (PVDF) hollow fiber membranes as well as elucidates the correlation among membrane morphology, crystallinity and mechanical properties as functions of non-solvent additives and dope rheology in the phase inversion process. A series of non-solvents (i.e. water, methanol, ethanol, isopropanol) are used either as non-solvent additives in the dope or as a component in the external coagulant. Depending on the strength of the non-solvent, the phase inversion of semi-crystalline PVDF membranes is dominated by liquid-liquid demixing or solid-liquid demixing accompanying crystallization. As a result, the membrane morphology transforms from an interconnected-cellular type to an interconnected-globule transition type with lower mechanical strengths when adding water, methanol, ethanol, or isopropanol into the spinning dopes or into the coagulation bath. The crystallinity and size of spherulitic globules in the morphology are controlled by the amounts of non-solvents presented in the systems. The rheological behavior of dope solutions is explored and the relationship between elongation viscosity and mechanical properties has been elaborated. Analytical methods and molecular dynamics simulations are employed to provide insights mechanisms from the views of thermodynamic and kinetic aspects as well as the state of polymer chains involved in the phase inversion process. © 2009 Elsevier B.V. All rights reserved.
Source Title: Journal of Membrane Science
URI: http://scholarbank.nus.edu.sg/handle/10635/89475
ISSN: 03767388
DOI: 10.1016/j.memsci.2009.05.029
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