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The Membrane Society of Korea (한국막학회)
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Characterization and Preparation of Polyimide Copolymer Membranes by Non-Solvent Induced Phase Separation Method

비용매 유도 상전이법을 이용한 공중합체 폴리이미드 분리막의 제조 및 특성평가

  • Lee, Jung Moo (Department of Materials Engineering and Convergence Technology, Gyeongsang National University) ;
  • Park, Jeong Ho (Department of Materials Engineering and Convergence Technology, Gyeongsang National University) ;
  • Kim, Deuk Ju (Department of Materials Engineering and Convergence Technology, Gyeongsang National University) ;
  • Lee, Myung Gun (Aekyung Petrochemical Co., LTD.) ;
  • Nam, Sang Yong (Department of Materials Engineering and Convergence Technology, Gyeongsang National University)
  • 이정무 (경상대학교 나노신소재융합공학과) ;
  • 박정호 (경상대학교 나노신소재융합공학과) ;
  • 김득주 (경상대학교 나노신소재융합공학과) ;
  • 이명건 (애경유화 중앙연구소) ;
  • 남상용 (경상대학교 나노신소재융합공학과)
  • Received : 2015.08.11
  • Accepted : 2015.08.24
  • Published : 2015.08.31
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Abstract

In this study, we synthesis polyimide with high gas selectivity using 2,2-bis(3,4-carboxylphenyl) hexafluoropropane, 2,4,6-Trimethyl-1,3-phenylenediamine (DAM) and 4,4-Methylenedianiline (p-MDA), and then the asymmetric membrane was fabricated by non-solvent phase separation method. To confirm the property change of the membrane using different solvent, we measured and compared the viscosity of the polymer solution, cloud point and non-solvent phase separation coefficient. The morphology and gas separation property of membrane prepared by phase separation method was confirmed using Field Emission Scanning Electron Microsope and the single gas permeation measurement apparatus. The single gas ($CH_4$, $N_2$, $O_2$, $CO_2$) permeation property and selectivity value of the membrane prepared with NMP was higher than the membrane prepared with DMAc. We confirmed that the gas selectivity of the membrane increased and the permeation property decreased with increasing of the solvent evaporation time.

본 연구에서는 높은 기체선택도를 가지는 폴리이미드의 제조를 위해 2,2-bis(3,4-carboxylphenyl) hexafluoropropane과 두 종류의 아민인 2,4,6-Trimethyl-1,3-phenylenediamine (DAM)과 4,4-Methylenedianiline (p-MDA)을 이용하여 합성을 진행한 후 비용매 상전이법으로 비대칭 분리막을 제조하였다. 분리막 제조에 사용된 용매에 따른 물성변화를 확인하기 위하여 고분자 용액의 점도, 흐림점 측정을 통한 고분자의 상평형도, 비용매 상전이 계수 측정을 진행하였다. 상전이법을 이용하여 제조된 분리막은 SEM을 통해 용매 휘발시간에 변화에 따른 모폴로지를 확인하였고 이의 변화에 따른 기체 투과도 변화를 확인하였다. 기체투과도는 디메틸아세트아마이드를 사용하였을 때보다 N-메틸-2-피롤리돈을 사용하였을 때 $CH_4$, $N_2$, $O_2$, $CO_2$의 투과도와 각 기체에 대한 선택도가 높은 것을 확인하였다. 또한 용매 휘발 시간이 길수록 기체 투과도는 감소하지만 기체에 대한 선택도가 증가하는 것을 확인하였다.

Keywords

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