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    Title: Fine structure of poly(vinylidene fluoride) membranes prepared by phase inversion from a water/N-methyl-2-pyrollidone/poly(vinylidene fluoride) system
    Authors: Lin, Dar-Jong;Beltsios, Konstantinos;Chang, Cheng-Liang;Cheng, Liao-Ping
    Contributors: 淡江大學化學工程與材料工程學系
    Keywords: Crystal structure;Crystallization;Crystals;Differential scanning calorimetry;Gelation;Isotherms;Mass transfer;Phase composition;Phase diagrams;Solvents;Water;Crystallization-induced gelation line;Poly(vinylidene fluoride);Polymeric membranes
    Date: 2004-03
    Issue Date: 2013-06-13 11:29:19 (UTC+8)
    Publisher: Hoboken: John Wiley & Sons, Inc.
    Abstract: The structure and formation mechanism of a microporous phase-inversion poly(vinylidene fluoride) (PVDF) membrane exhibiting a relatively loosely packed agglomerate of semicrystalline globules are explored. The membrane has been prepared by the coagulation of a solution of PVDF in dimethylformamide by the action of 1-octanol, which is a soft nonsolvent. Experimental observations pertain to the globule surface, which is dominated by a grainy nanostructure; the globular interior, which exhibits a range of fine structures (e.g., twisted sheets and treelike branches); and the globule–globule connections, which exhibit a sheetlike or ropelike structure. On the basis of the observed structural details and phase diagram considerations, it is proposed that the membrane structure is the result of a unique combination of a polymer crystallization and a liquid–liquid phase-separation process, with end-result globular structural features of remarkable uniformity.
    Relation: Journal of Polymer Science, Part B: Polymer Physics 42(5), pp.830-842
    DOI: 10.1002/polb.10774
    Appears in Collections:[化學工程與材料工程學系暨研究所] 期刊論文

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