Polymer composite membrane of sulfonated and nonsulfonated polysulfone for direct methanol fuel cell = 연료전지를 위한 술폰화/비술폰화 폴리술폰 복합 멤브레인의 몰폴로지와 물성에 관한 연구

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In order to enhance the proton conductivity and to reduce the methanol crossover in the direct methanol fuel cell(DMFC) the polymer blend membranes composed of proton conducting component and methanol barrier component were prepared. Sulfonated poly(arylene ether sulfone) copolymer with 60mol% sulfonation (sPAES-60) was synthesized via poly-condensation reaction from 3,3’-disulfonated -4,4’-dichlorodiphenyl sulfone (SDCDPS), 4,4’-dichlorodiphenyl sulfone (DCDPS), and 4,4’-biphenol(BP) for the proton conducting component. To compensate for the mechanical and chemical weakness of the sPAES-60 and to reduce the methanol permeability poly ether sulfone copolymer (RH-2000, Solvay) was used. By varying the drying condition (HT, FD1, FD2) and the concentration of the casting solution (10wt%, 15wt%, 20wt%) various types of phase separated morphologies of the blend membranes were obtained. The morphology was characterized by SEM, EDAX, and AFM. The AC impedance spectroscopy was used to measure the proton conductivity and the liquid permeability measuring instrument was designed to measure the methanol permeability. The state of water in the membranes was confirmed by the DSC and it was used to correlate the morphology of the membrane with the membrane transport properties. In this thesis the effect of the drying condition on the phase separation and morphology of the blend membranes was investigated and then the transport properties of the blend membranes were discussed.
Advisors
Kim, Sung-Chulresearcher김성철researcher
Description
한국과학기술원 : 생명화학공학과,
Publisher
한국과학기술원
Issue Date
2007
Identifier
264274/325007  / 020053069
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 생명화학공학과, 2007.2, [ viii, 96 p. ]

Keywords

composite; blend; DMFC; Fuel cell; membrane; 폴리술폰; 블렌드 멤브레인; 직접멤탄올연료전지; 연료전지; polysulfone

URI
http://hdl.handle.net/10203/29924
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=264274&flag=dissertation
Appears in Collection
CBE-Theses_Master(석사논문)
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