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자료유형
학술대회자료
저자정보
Lee, Chang-Hyun (National Research Laboratory for Membrane, School of Chemical Engineering, College of Engineering, Hanyang University) Park, Chi-Hoon (National Research Laboratory for Membrane, School of Chemical Engineering, College of Engineering, Hanyang University) Park, Ho-Bum (National Research Laboratory for Membrane, School of Chemical Engineering, College of Engineering, Hanyang University) Lee, Young-Moo (National Research Laboratory for Membrane, School of Chemical Engineering, College of Engineering, Hanyang University)
저널정보
한국막학회 한국막학회 총회 및 학술발표회 한국막학회 2003년도 추계 총회 및 학술발표회
발행연도
2003.1
수록면
61 - 63 (3page)

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A major research objective related to proton exchange membrane(PEM) for DMFC is to achieve high proton conductivity over 10$^{-2}$ S/cm, high hydrolytic stability and low methanol permeability with low cost base materials. for the purpose, a lot of thermoplastic polymers such as polysulfones, polyethersulfone, polyetherketones, polyimides, polyoxadiazole, polyphosphazene and polybenzimidazol have been investigated. Amongst those polymers, polyimides have been suggested as a potential PEM due to their excellent thermal, chemical stability and good mechanical properties. Generally, polyimides are synthesized by polycondensation with numerious diamines and dianhydriedes. In our study, polyimide was prepared using non-sulfonated diamine, sulfonated diamine directly synthesized by fuming sulfuric acid, and naphthalenic dianhydride to improve the hydrolysis stability under acidic condition. Through monomer sulfonation-subsequent polymerization method, the high proton conducting capability and the desired sulfonation level were effectively controlled at the same time. To reduce severe methanol transport through the membrane, the chemical crosslinking among polymer chains was introduced using various crosslinking agents with different chain lengths. The crosslinked sulfonated polyimide membranes showed high proton conductivity up to 8.09$\times$10$^{-2}$ S/cm and from crosslinking effect methanol transport through the membranes was considerably reduced as compared with unmodified membranes. For increase of chain length of crosslinker, methanol permeability was adversely reduced to 10$^{-8}$ $\textrm{cm}^2$/s due to decrease of IEC and increase of crosslinking desity.

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