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    Please use this identifier to cite or link to this item: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/116206

    Title: Effect of inner non-solvent condition on morphology of PVDF hollow fiber membranes prepared by NIPS spinning process
    Authors: Hsu-Hsien Chang;Sheng-Chang Chen;Liao-Ping Cheng
    Keywords: PVDF;Hollow Fiber;Membrane;Morphology;NIPS
    Date: 2018-03
    Issue Date: 2019-04-10 12:10:37 (UTC+8)
    Abstract: Hollow fiber membranes of PVDF were prepared by isothermal wet spinning process from the
    water/DMF/PVDF system at 25 C. The dope solution comprised 21 wt% PVDF in DMF, and pure
    water was employed both as the inner and outer coagulants. SEM imaging of the membrane indicated
    an unexpected interesting morphology: columnar macrovoids extended from the outer surface to the
    central region, while cellular pores constituted the inner half of the membrane. As water was a harsh
    nonsolvent, one tended to think that macrovoids shall form towards the inner surface of the hollow
    fiber. Absence of macrovoids in this region was explained based on the fact that DMF would
    accumulate rapidly in the inner extruding stream as it underwent mass-exchange with water in the
    inner bath. Such activity rendered effectively the coagulant became effectively a soft one. As a result,
    macrovoids was eliminated and the inner surface became porous.
    Relation: Journal of Applied Science and Engineering 21(1), p.89-98
    DOI: 10.6180/jase.201803_21(1).0011
    Appears in Collections:[Graduate Institute & Department of Chemical and Materials Engineering] Journal Article

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