English  |  正體中文  |  简体中文  |  Items with full text/Total items : 17756/20057 (89%)
Visitors : 7927568      Online Users : 539
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
Scope Tips:
  • please add "double quotation mark" for query phrases to get precise results
  • please goto advance search for comprehansive author search
  • Adv. Search
    HomeLoginUploadHelpAboutAdminister Goto mobile version
    Please use this identifier to cite or link to this item: http://ir.cnu.edu.tw/handle/310902800/22097

    標題: Effect of casting conditions on characterization and morphology of asymmetric Polysulfone Membranes in wet phase inversion process
    作者: Hsien-chung Ho
    Shih-Hsiung Chen
    Rey-May Liou
    Li-jyur Tsai
    Jing-Song Chang
    Chia-Yuan Chang
    Chi-Yu Shih
    貢獻者: 職業安全衛生系
    日期: 2008-07
    上傳時間: 2009-12-28 17:07:17 (UTC+8)
    摘要: This paper presents an original approach to study the dependence of casting conditions in wet phase inversion process and their influence on the membrane morphology and separation performance of water/ethanol mixture by pervaporation. The casting conditions of polysulfone membrane were carried out with various coagulation temperatures and polymer concentration in water bath. It was found that the asymmetric polysulfone membranes showed a strongly influence on the skin layer structure and the separation performance in pervaporation. The decrease in skin layer thickness of asymmetric was obtained by increasing the coagulation temperature due to the decline in demixing rate of non-solvent in the coagulation bath. On the other hand, the polymer concentration also dominated the membrane formation path ways in wet phase inverse method. In this study, the lowering in polymer concentration in polysulfone/NMP/water system, the defective skin layer was obtained and presents a poor separation performance. Based on the morphology observation, light transmittance measurement, and pervaporation test, the asymmetric polysulfone membrane with defect free skin layer can be obtained by the predominated casting conditions and polymer concentration. This study is successful to prepare a defect free skin layer asymmetric polysulfone membranes by controlling the coagulation temperature and polymer concentration in casting solution. The SEM observations found that the defect free skin layer was formed by lowering the temperature in coagulation in wet phase inverse process. On the other hand, an increasing in polymer concentration obtained the same defect free skin layer structure of asymmetric membranes in wet phase inverse process. The pervaporation performance of those membranes confirmed the morphology observation and presented a good performance. The light transition measurements were used to verify the change of membrane formation path ways of those membranes. For preparing the defect free skin layer asymmetric membrane, this study indicated that the controlling membranes formation path ways could be easy achieved by lowing the coagulation temperature or increasing the polymer concentration in casting solution. The permeation measurement showed that the permselectivity of asymmetric membrane was dominated by the skin layer morphology. It is suggested that the high performance pervaporation membrane can be prepared by phase inverse method by lowing the coagulation temperature and increasing the polymer concentration in casting solution.
    關聯: ICOM 2008,起迄日:2008/7/12~2008/7/18,地點:Honolulu, Hawaii USA
    Appears in Collections:[職業安全衛生系(含防災所)] 會議論文

    Files in This Item:

    File Description SizeFormat
    97_205_pro.pdf341KbAdobe PDF422View/Open

    All items in CNU IR are protected by copyright, with all rights reserved.

    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - Feedback