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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/44168


    Title: Formation of crystalline EVAL membranes by controlled mass transfer process in water–DMSO–EVAL copolymer systems
    Authors: 鄭廖平;Cheng, Liao-ping;Young, Tai-horng;You, Wei-ming
    Contributors: 淡江大學化學工程與材料工程學系
    Keywords: EVAL;Crystallization;Liquid–liquid demixing;Immersion–precipitation;Diffusion
    Date: 1998-06
    Issue Date: 2010-03-09 10:00:10 (UTC+8)
    Publisher: Amsterdam: Elsevier BV
    Abstract: The effect of solvent content in the coagulation bath on the formation of poly(ethylene-co-vinyl alcohol) (EVAL) membranes by isothermal immersion–precipitation in water–dimethylsulfoxide (DMSO)–EVAL system has been investigated. As a homogeneous EVAL dope is immersed in a harsh bath, e.g., water, instant precipitation occurs initiated by the liquid–liquid demixing process. The formed membrane exhibits an asymmetric morphology with extensive finger-like macrovoids, similar to that observed in most amorphous polymeric membranes. On the other hand, if precipitation takes place in a soft bath containing a substantial amount of solvent, crystallization, rather than liquid–liquid demixing, starts to dominate and a skinless, bi-continuous, particulate membrane becomes the precipitated product. The immersion–precipitation process for the present system has been modeled as a ternary mass transfer problem. The calculated diffusion trajectories and concentration profiles illustrate reasonably the membrane morphologies formed in various immersion conditions.
    Relation: Journal of membrane science 145(1), pp.77-90
    DOI: 10.1016/S0376-7388(98)00063-5
    Appears in Collections:[Graduate Institute & Department of Chemical and Materials Engineering] Journal Article

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