English  |  正體中文  |  简体中文  |  全文筆數/總筆數 : 62637/95499 (66%)
造訪人次 : 3015975      線上人數 : 384
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
搜尋範圍 查詢小技巧:
  • 您可在西文檢索詞彙前後加上"雙引號",以獲取較精準的檢索結果
  • 若欲以作者姓名搜尋,建議至進階搜尋限定作者欄位,可獲得較完整資料
  • 進階搜尋
    請使用永久網址來引用或連結此文件: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/44450


    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

    文件中的檔案:

    檔案 大小格式瀏覽次數
    0KbUnknown292檢視/開啟

    在機構典藏中所有的資料項目都受到原著作權保護.

    TAIR相關文章

    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library & TKU Library IR teams. Copyright ©   - 回饋