Membrane Journal (멤브레인)

The Membrane Society of Korea (한국막학회)
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Gas Transport Properties of Soluble Polyimides Containing Alicyclic Dianhydride

지환족 다이안하이드라이드를 포함하는 용해성 폴리이미드의 기체투과특성

  • Kim, Eun Hee (Resources Separation & Recovery Research Group (RSRRG), Environmental Resources and Process Research Center, Korea Research Institute of Chemical Technology) ;
  • Park, Chae Young (Resources Separation & Recovery Research Group (RSRRG), Environmental Resources and Process Research Center, Korea Research Institute of Chemical Technology) ;
  • Kim, Jeong-Hoon (Resources Separation & Recovery Research Group (RSRRG), Environmental Resources and Process Research Center, Korea Research Institute of Chemical Technology)
  • 김은희 (한국화학연구원 환경자원공정연구센터 자원분리회수그룹) ;
  • 박채영 (한국화학연구원 환경자원공정연구센터 자원분리회수그룹) ;
  • 김정훈 (한국화학연구원 환경자원공정연구센터 자원분리회수그룹)
  • Received : 2014.02.18
  • Accepted : 2014.03.18
  • Published : 2014.04.30
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Abstract

In this work, soluble polyimides were synthesized and characterized from 5-(2,5-dioxotetrahydrofuryl)-3-methyl-3-cyclohexene-1,2-dicarboxylic anhydride (DOCDA) and two diamines such as 4,4'-diaminodiphenylether (ODA), 1,4-phenylenediamine (p-PDA). Their thermal properties were analyzed with differential scanning calorimeter (DSC). The gas permeability coefficients (P) and ideal selectivity for $CH_4$ and $CO_2$ of the prepared polyimide membranes were measured with a time-lag apparatus. DOCDA-ODA, DOCDA-p-PDA showed good permeability and selectivity; the permeabilities of $CO_2$ was 6.10, 0.74 barrers and the selectivity of $CO_2/CH_4$ were 67.03, 46.25, respectively. Therefore, DOCDA-ODA showed good possibility as gas separation membrane.

본 연구에서는 용해성 폴리이미드 합성을 위해 지환족(alicyclic) dianhydride 단량체인 5-(2,5-dioxotetrahydrofuryl)-3-methyl-3-cyclohexene-1,2-dicarboxylic anhydride (DOCDA)와 diamine으로는 4,4'-diaminodiphenylether (ODA), 1,4-phenylenediamine (p-PDA)를 사용하여 두 가지 폴리이미드를 제조한 후 그 특성을 고찰하고 기체투과특성을 알아보았다. 제조된 폴리이미드는 FT-IR을 통해 합성이 성공적으로 이루어졌음을 확인하였고 DSC를 통하여 열적 안정성을 알아보았다. 제조된 폴리이미드막의 $CH_4$와 $CO_2$에 대한 기체투과계수(P)와 이상 선택도는 time-lag 장비로 측정하였다. 그 결과, DOCDA-ODA, DOCDA-p-PDA의 경우 $CO_2$의 투과도는 각각 6.10, 0.74 barrer로 나타났고 $CO_2/CH_4$의 선택도는 67.03, 46.25의 결과를 나타내었다. 두 가지 폴리이미드 중 DOCDA-ODA의 경우 폴리이미드 재료의 특성인 우수한 투과도 및 선택도로 새로운 기체분리막으로서의 이용가능성을 나타내었다.

Keywords

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