Nafion/sulfonated poly(arylene ether sulfone) composite membrane for fuel cell = 연료전지용 Nafion/sulfonated poly(arylene ether sulfone) 복합막의 개발에 관한 연구

Cited 0 time in webofscience Cited 0 time in scopus
  • Hit : 271
  • Download : 0
In this thesis, we prepared composite membranes consisting Nafion and poly(arylene ether sulfone). Poly(arylene ether sulfone)s varied degree of sulfonation were coated onto the surface of Nafion as a methanol barrier layer and solution blend of Nafion and PSSf were prepared. The aim of this work is reducing methanol crossover by obstructing the ionic clusters of Nafion membrane related to the methanol crossover. To reduce methanol crossover, this work focused on the development of the phase separated composite membrane. Sulfonated poly(arylene ether sulfone)s were successfully synthesized by direct polymerization using nucleophilic substitution condensation polymerization. FT-IR and NMR data confirmed that the sulfonate groups were quantitatively introduced. Thermal stability, glass transition temperature, decomposition temperature, ion exchange capacity, proton conductivity, and water uptake were investigated. The properties of prepared membranes were investigated by scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDAX). The modified Nafion membranes by coating of sulfonated poly(arylene ether sulfone) showed phase separated morphology. The degree of phase separation could be controlled by variation of the condition of Nafion and the degree of sulfonation of poly(arylene ether sulfone). The penetration depth, the size, and number of Nafion domain were also varied. Solution blend of Nafion and sulfonated poly(arylene ether sulfone) was used to improve affinity between two polymers. The cross-sections of solution blend also showed phase separated morphology. The degree of phase separation and the phase separation mechanism could be controlled by varing the blend ratio and the degree of sulfonation of poly(arylene ether sulfone). These complex morphologies can be applied for reducing methanol crossover in DMFC. Phase separated top layer with PSSf matrix can reduce the methanol crossover and phase separated bottom layer with Nafion matrix...
Advisors
Kim, Sung-Chulresearcher김성철researcher
Description
한국과학기술원 : 생명화학공학과,
Publisher
한국과학기술원
Issue Date
2004
Identifier
238396/325007  / 020023633
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 생명화학공학과, 2004.2, [ 68 p. ]

Keywords

NAFION; POLYMER ELECTROLYTE MEMBRANE; DIRECT METHANOL FUEL CELL; FUEL CELL; SULFONATED POLY(ARYLENE ETHER SULFONE); 술폰화된 폴리술폰; 나피온; 고분자 전해질막; 직접 메탄올 연료 전지; 연료 전지

URI
http://hdl.handle.net/10203/29839
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=238396&flag=dissertation
Appears in Collection
CBE-Theses_Master(석사논문)
Files in This Item
There are no files associated with this item.

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0