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    Please use this identifier to cite or link to this item: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/71712

    Title: PVDF Membrane formation by diffusion induced phase sparation-morphology prediction based on phase behavior and masss transfer modeling
    Authors: Cheng, Liao-ping;Lin, Dar-jong;Shih, Chien-hsieh;Dwan, An-hwa;Gryte, Carl C.
    Contributors: 淡江大學化學工程與材料工程學系
    Keywords: poly(vinylidene fluoride);membrane;phase diagram;immersion precipitation;diffusion
    Date: 1999-01
    Issue Date: 2011-10-24 01:33:44 (UTC+8)
    Publisher: Hoboken: John Wiley & Sons, Inc.
    Abstract: The equilibrium phase behavior of water (nonsolvent)-DMF (solvent)-PVDF system at 25°C was investigated via both theoretical and experimental approaches. Using binary interaction parameters, χij, obtained previously, the theoretical phase boundaries were computed and were found to match closely the measured binodal and crystallization-induced gelation data. Membranes were prepared using the isothermal immersion-precipitation processes in various dope and bath conditions. The formed membranes demonstrated a broad spectrum of morphologies: At one extreme, asymmetric structure was obtained featuring a continuous tight skin and a sublayer composed of parallel macrovoids and cellular pores; at the other limit, skinless microporous membrane was produced with spherical particles packed into a bi-continuous structure. The crystalline characters of PVDF gels and membranes were examined by small angle light scattering, scanning electron microscopy, and differential scanning calorimetry techniques. In addition, diffusion trajectories and concentration profiles in the membrane solution before precipitation were calculated for the immersion process. These results predicted reasonably the various morphologies observed in the membranes
    Relation: Journal of polymer science. part B, polymer physics 37(16), pp.2079-2092
    DOI: 10.1002/(SICI)1099-0488(19990815)37:16<2079::AID-POLB11>3.0.CO;2-Q
    Appears in Collections:[Graduate Institute & Department of Chemical and Materials Engineering] Journal Article

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