The Preparation of Polysiloxaneimide Membranes and their Pervaporation Properties

폴리실록산이미드 막의 제조와 투과증발특성

  • Chang, Yeon-Hee (Division of Advanced Chemical Technology, Korea Research Institute of Chemical Technology) ;
  • Kim, Jeong-Hoon (Division of Advanced Chemical Technology, Korea Research Institute of Chemical Technology) ;
  • Lee, Soo-Bok (Division of Advanced Chemical Technology, Korea Research Institute of Chemical Technology) ;
  • Rhee, Hee-Woo (Department of Chemical Engineering, Sogang University)
  • 장연희 (한국화학연구소 화학기술연구부) ;
  • 김정훈 (한국화학연구소 화학기술연구부) ;
  • 이수복 (한국화학연구소 화학기술연구부) ;
  • 이희우 (서강대학교 화학공학과)
  • Received : 1999.07.23
  • Accepted : 1999.09.14
  • Published : 1999.11.10

Abstract

Three polysiloxaneimide(PSI) as membrane material were prepared by polycondensation of three aromatic dianhydrides(6FDA, BTDA, PMDA) with one siloxane-containing diamine(SIDA, aver. MW. 800). The PSIs were rubbery polymers containing 30~40 wt % of flexible siloxane chains and exhibited low density, high fractional free volume and low surface energy. They were used for pervaporation experiments with 0.05 wt % of four organic aqueous solutions containing ethyl acetate, methylene chloride, trichloroethylene, and toluene, respectively. With increasing hydrophobicity of organic solvents, both pervaporation selectivity and pemeation flux increase.

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