Membrane Journal (멤브레인)

The Membrane Society of Korea (한국막학회)
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Preparation of Hydroxy Polyimde Membranes for Gas Separation by Phase Inversion Method

상전이법을 이용한 기체 분리용 Hydroxy Polyimide 막의 제조

  • Woo, Seung-Moon (School of Materials Science and Engineering, Engineering Research Institute, I-Cube Center, Gyeongsang National University) ;
  • Choi, Jong-Jin (School of Materials Science and Engineering, Engineering Research Institute, I-Cube Center, Gyeongsang National University) ;
  • Nam, Sang-Yong (School of Materials Science and Engineering, Engineering Research Institute, I-Cube Center, Gyeongsang National University)
  • 우승문 (경상대학교 나노신소재공학부, 공학연구원, 아이큐브사업단) ;
  • 최종진 (경상대학교 나노신소재공학부, 공학연구원, 아이큐브사업단) ;
  • 남상용 (경상대학교 나노신소재공학부, 공학연구원, 아이큐브사업단)
  • Received : 2012.02.14
  • Accepted : 2012.02.28
  • Published : 2012.02.29
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Abstract

In this study, for preparation of gas separation membrane with high permeability, hydroxy polyimide was synthesized using 6FDA and APAF. Synthesis of HPI was confirmed by H-NMR and FT-IR, thermal property of membrane was characterized by Differential scanning calorimetric (DSC) and thermogravimetric analyzer (TGA). Especially, the synthesized HPI can possible to search conversion to PBO at $450^{\circ}C$. To obtain the membrane having high permeability, ternary system consist of polymer, solvent and non-solvent additive was introduced, asymmetric HPI flat sheet membrane was prepared by phase inversion method. Finally, the change of morphology with each component was observed through FE-SEM.

본 연구에서는 고투과성을 가지는 기체분리막 제조를 위해 6FDA와 APAF를 이용하여 하이드록시 폴리이미드를 합성하였다. H-NMR과 FT-IR 분석을 통해서 HPI의 합성여부를 확인하였으며 열적특성을 알아보기 위해 Differential scanning calorimetry (DSC)와 thermogravimetric analyzer (TGA)를 측정하였다. 특히 합성된 HPI는 약 $450^{\circ}C$에서 polybenzoxazole (PBO)로 변환이 됨을 확인 가능하였다. 고투과성 고분자 분리막의 제조를 위해 고분자, 용매 그리고 비용매-첨가제를 포함하는 3성분계의 시스템을 도입하였으며, 상전이법을 이용하여 HPI 비대칭 평막을 제조하였다. 최종적으로 각성분들에 따른 모폴로지 변화를 전계방출주사현미경(FE-SEM)을 통해 확인할 수 있었다.

Keywords

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