Synthesis and characterization of sulfonated polyimide membranes for direct methanol fuel cell

被引:282
作者
Woo, Y
Oh, SY
Kang, YS
Jung, B
机构
[1] Korea Inst Sci & Technol, Polymer Phys Lab, Seoul 130650, South Korea
[2] Sogang Univ, Dept Chem Engn, Seoul 100611, South Korea
关键词
sulfonated polyimide; DMFC; methanol permeability; proton conductivity; water cluster;
D O I
10.1016/S0376-7388(03)00185-6
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The sulfonated polyimide (SPI) membranes for direct methanol fuel cell (DMFC) were synthesized with 3,3,4,4'-benzophenonetetracarboxylic dianhydride (BTDA), 2,2'-benzidinedisulfonic acid (BDSA), 4,4'-oxydianiline (ODA) through classical two-step methods: (1) preparation of sulfonated poly(amic acid) (SPAA) precursors with different sulfonation levels by controlling the molar ratio of BDSA to ODA, and (2) thermal imidization of the SPAA films. The chemical structure and the imidization from SPAA membranes were characterized by FT-IR with temperature, and the sulfonation levels were determined by elemental analysis. The thermal stability of the membranes was also characterized by TGA. From water uptake and small angle X-ray scattering (SAXS) experiments for different sulfonation levels, it was found that the number of water clusters in SPI membranes increased as the water uptake of membranes increased, but the size of water cluster was not changed with the sulfonation levels. The proton conductivity and the methanol permeability of SPI membrane showed a sudden leap like a percolation phenomenon around 35 mol% of sulfonation level. The SPI membranes exhibited relatively high proton conductivity and extremely low methanol permeability, and showed the feasibility of suitable polymer electrolyte membranes (PEM) for DMFC. (C) 2003 Elsevier B.V. All rights reserved.
引用
收藏
页码:31 / 45
页数:15
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