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Blended and Cross-Linked Ionomer Membranes for Application in Membrane Fuel Cells

刊名：	Fuel Cells
作者：	J. A. Kerres
刊号：	813E0001
ISSN：	1615-6846
出版年：	2005
年卷期：	2005, no.2
页码：	230-247
总页数：	18
分类号：	TQ15
关键词：	Acid Base；Blend；Cross-Linking；DMFC；PEFC；Sulfinate ζ-Alkylation；Swelling
参考中译：
语种：	eng
文摘：	Differently cross-linked blend membranes were prepared from commercial arylene main-chain polymers of the poly(etherke-tone) and poly(ethersulfone) classes, modified with sulfonate groups, sulfinate cross-linking groups, and basic N-groups. The following membrane types have been prepared: (i) Van-der Waals/dipole-dipole blends by mixing a poly-sulfonate with unmodified PSU. This membrane type showed a heterogeneous morphology, leading to extreme swelling and even dissolution of the sulfonated component at elevated temperatures, (ii) Hydrogen bridge blends by mixing a polysulfonate with a polyamide or a polyetheri-mide. This membrane type showed a partially heterogeneous morphology, also leading to extreme swelling/dissolution of the sulfonated blend component at elevated temperatures. (iii) Acid-base blends by mixing a polysulfonate with a polymeric N-base (in-house developed/commercial). A wide range of properties could be achieved with this membrane type by variation of the different parameters. Membranes showing excellent stability and good fuel cell performance up to 100℃ (PEFC) and 130℃ (DMFC) were obtained, (iv) Covalently cross-linked (blend) membranes by either mixing a polysulfonate with a polysulfinate or by preparing a polysulfinatesulfonate, followed by reaction of the sulfinate groups in solution with a dihalogeno compound under S-alkylation. The membranes prepared showed effective suppression of swelling without a loss in the H{sup}+ -conductivity. The membranes showed good PEFC (up to 100℃) and DMFC (up to 130℃) performance, (v) Covalent-ionically cross-linked blend membranes by mixing polysulfonates with polysulfinates and polybases or by mixing a polysulfonate with a polymer carrying both sulfinate and basic N-groups. The covalent-ionically cross-linked membranes were tested in a DMFC up to 110℃ and demonstrated good performance, (vi) Differently cross-linked organic-inorganic blend composite membranes w various procedures. The best results were obtained with blend membranes having a layered zirconium phosphate "ZrP" phase: they were transparent, and showed good H{sup}+-conductMty and stability. The application of one of these composite membranes in a PEFC yielded good performance up to T= 115℃.