화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.17, No.5, 564-569, September, 2000
DOI10.1007/BF02707167  Export Citation
Liquid-Liquid Phase Separation during Polysulfone Membrane Preparation
Je Young Kim, Hwan Kwang Lee1, and Sung Chul Kim†
  • Center for Advanced Functional Polymers, Korea Advanced Institute of Science and Technology, 373-1, Kusong-Dong, Yusung-Gu, Taejon 305-701, Korea
  • 1Department of Industrial Chemistry, Chungwoon University, 29, Namjang-Ri,Hongsung-Eub, Hongsung-Gun, Chungnam 350-800, Korea
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The cloud point curves for a ternary system of PSf/NMP/water were determined by a titration method at 15 degrees C, 30 degrees C, 45 degrees C and 60 degrees C. A small amount of water (3-10 wt% water) was needed to achieve liquid-liquid phase separation and the temperature effect was not significant. The vitrification composition for the ternary system of PSf/NMP/water was determined by DSC measurements for various compositions. Cross-sectional membrane morphologies were examined by SEM (Scanning Electron Microscope) and surface morphologies by AFM (Atomic Force Microscope) varying the parameters including polymer concentration and bath compositions. It was observed that there were two different modes of phase separation during the formation of polysulfone membrane when the coagulation conditions were varied.
Keywords:Phase Diagram;Phase Separation;Polysulfone Membrane;Vitrification;Atomic Force Microscope (AFM)
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