淡江大學機構典藏:Item 987654321/44450
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    題名: Effect of the temperature of polyurethane dissolution on the mechanism of wet-casting membrane formation
    作者: Cheng, Liao-ping;Huang, Yen-shih;Young, Tai-horng
    貢獻者: 淡江大學化學工程與材料工程學系
    關鍵詞: Polyurethane;Dissolution temperature;Particulate membranes
    日期: 2003-03-01
    上傳時間: 2010-03-09 10:22:27 (UTC+8)
    出版者: Elsevier
    摘要: An analysis of data from scanning electron microscopy (SEM), gel permeation chromatography (GPC) and differential scanning calorimetry (DSC) for two series of polyurethane membranes is presented. Membranes were prepared by direct immersion of the casting solution of polyurethane, dissolved in dimethyl formamide at different temperatures, into either water or 1-octanol bath at 25 °C. Depending on the temperature of polyurethane dissolution, a gradual variety in the membrane structure was observed by SEM. As the temperature of polymer dissolution was increased, the membrane structure changed from dense to cellular or particulate morphologies. On the basis of the GPC and DSC results, polyurethane molecular weight decreased but the degree of microphase separation caused by clustering of some of the soft and hard segments into separate domains in the membrane increased with increasing the temperature of polymer dissolution. It is thus proposed that the change in membrane structure is due to the variation of molecular weight of polyurethane, which in turn can change polymer chain mobility during membrane formation. In addition, the extent of microphase separation was described and related to the particulate morphology when 1-octanol was used as the nonsolvent.
    關聯: European polymer journal 39(3), pp.601-607
    DOI: 10.1016/S0014-3057(02)00235-5
    顯示於類別:[化學工程與材料工程學系暨研究所] 期刊論文

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