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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/94363

    Title: PVDFPMMA摻合膜於共溶劑中浸漬分相製備網狀奈米多孔性PVDF薄膜之探討與應用
    Other Titles: Study of Co-solvent extraction induced phase separation to form network nanoporous PVDF membrane
    Authors: 游象廷;Yu, Hsiang-Ting
    Contributors: 淡江大學化學工程與材料工程學系碩士班
    Keywords: 聚偏二氟乙烯;聚甲基丙烯酸甲酯;多孔薄膜;共溶劑中浸漬分相沉澱法;PVDF;PMMA;porous membrane;Co-solvent extraction induced phase separation
    Date: 2013
    Issue Date: 2014-01-23 14:28:02 (UTC+8)
    Abstract: 本研究主要探討利用共溶劑膨潤PVDF/PMMA摻合膜中PVDF與PMMA所形成的無定型連續相,並且移除PMMA,使PVDF再結晶分相沉形成多孔薄膜。在本實驗中,不同降溫程序製備不同組成的摻合膜,探討改變共溶劑組成與溫度來製備孔隙薄膜。藉由SEM、DSC、XRD、拉力測試、接觸角量測等來分析摻合膜與多孔薄膜的性質。並利用溶液通量與薄膜蒸餾的應用測試,比較其與商用膜的特性。
    Network nanoporous poly(vinylidene fluoride) membrane was prepared by leaching poly(methyl methacrylate) with co-solvents from PVDF/PMMA blend film. In this research, we used different cooling methods to prepare the blend film from melt state, and used various co-solvent contents and temperatures to prepare porous PVDF membrane. The membranes were characterized by SEM, DSC, XRD, Universal Testing Machine and contact angle measurement. As to application such as liquid flow flux and membrane distillation, the membranes were compared to commercial PVDF membrane.
    Irrespective to cooling method employed for PVDF/PMMA blend films, the results of XRD indicated that both α and β type crystals might exist in blend films. From DSC measurement, we found that no significant PVDF melting peak was observed when PMMA blending content reached 45wt%.
    In porous PVDF membrane formation through leaching PMMA, porosity can be regulated by degree of swelling subjected to both the composition of co-solvent as leaching agent and blending ration of PVDF/PMMA blend film. Morphologies of the membrane observed by SEM showed that the membranes may have twisted sheaf-like network structure, which was more obvious as PMMA blending content reached 45wt%. If the degree of swelling during PMMA leaching process increased, PVDF prefer to phase separate in β type crystal. Nevertheless, when nearly all PMMA was removed, the membranes were revealed to have about the same crystallinity according to DSC analysis.
    The liquid flow-through flux was governed by the surface porosity and thickness of membrane. As to membrane distillation, both the pore size and thickness influenced the performance of the hydrophobic membrane.
    Appears in Collections:[化學工程與材料工程學系暨研究所] 學位論文

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