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ISSN : 1226-0088(Print)
ISSN : 2288-7253(Online)
Membrane Journal Vol.24 No.1 pp.1-9

지환족 다이안하이드라이드를 이용한 용해성 폴리이미드 공중합체 합성 및
메탄/이산화탄소 분리특성

박 채 영*,**, 이 용 택**, 김 정 훈*,†
*한국화학연구원 환경자원공정연구센터 자원분리회수연구그룹, **충남대학교 바이오응용화학과

Synthesis of Soluble Copolyimides Using an Alicyclic Dianhydride and Their CO2/CH4 Separation Properties

Jeong Hoon Kim*,†, Chae Young Park*,**, Yongtaek Lee**
*Resources Separation and Recovery Research Group, Division of Green Chemistry and Process,Korea Research Institute of Chemical Technology, Daejeon, 305-600, Korea
**Department of Bio-Applied Chemistry, Chungnam National University, Daejeon, 305-764, Korea
(Received October 4, 2013, Revised October 9, 2013, Accepted October 10, 2013)


In this study, four soluble homo- and co-polyimides using 5-(2,5-dioxotetrahydrofuryl)-3-methyl-3-cyclohexene-1,2-dicarboxylic anhydride (DOCDA) and 4,4'-diaminodiphenyl ether (ODA) monomers were synthesized to developthe gas separation membrane with good CO2/CH4separation properties. To prepare the copolyimides, 20 mol% of three dianhydrides- (4,4'-(hexafluoroisoproplidene)diphthalic anhydride (6FDA), 4,4'-biphthalic anhydride (BPDA), 3,3’,4,4’-benzophenonetetracarboxylic dianhydride (BTDA) - were added in DOCDA-ODA monomer mixture, respectively. All the synthesizedhomo- and co-polyimides were characterized by FT-IR. Their thermal properties were analyzed with differential scanningcalorimeter (DSC). Dense membranes were prepared from these copolyimides to check their gas permeation propertiesfor CO2 and CH4 gases using a time-lag method. The permeation testing results are as follows; DOCDA/ODA homopolymershowed 1.71 barrer of CO2 permeability and 74.35 of CO2/CH4 selectivity. The three polyimide copolymers (DOCDA/6FDA-ODA, DOCDA/BPDA-ODA, DOCDA/BTDA-ODA) showed lower CO2/CH4 selectivities and higher CO2 permeabilitiesthan the homopolymer (DOCDA-ODA). DOCDA/6FDA-ODA showed twice times higher CO2 permeabilitieswithout severe CO2/CH4 selectivity loss than the DOCDA-ODA.