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Indexed by: Journal Article

Date of Publication: 2010-01-01

Journal: ELECTROCHIMICA ACTA

Included Journals: EI、SCIE

Volume: 55

Issue: 3

Page Number: 709-714

ISSN: 0013-4686

Key Words: Proton exchange membrane; Sulfonated polyimides; DMFC; Methanol permeability

Abstract: A new series of six-member sulfonated copolyimides (SPIs) were prepared by one-step solution copolycondensation from 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTDA), 1,2-dihydro-2-(4-amino2-sulfophenyl)-4-[4-(4-amino-2-sulfonphenoxy)-phenyl] (2H)phthalazin-1-one (S-DHPZDA) 4 4'- bis(4-aminophenoxy) biphenyl (BAPB) and 1,2-dihydro-2-(4-aminophenyl)-4-[4-(4-(aminophenoxyl)-phenyl)](2H)phthalazin-1-one (DHPZDA). The sulfonation degree (DS) of the SPIs was controlled by the mol ratio of the sulfonated diamine and nonsulfonated diamine. The obtained SPI membranes had excellent thermal stability, high mechanical property and proton conductivity as well as low methanol permeability. The tensile strength of the SPI membranes was ranging from 54.7 to 98.1 Wa, which was much higher than that of Nafion (R). The SPI membranes exhibited high proton conductivity (sigma) and low methanol permeability ranged from 10(-3) to 10(-2) S/cm and 10(-8) to 10(-7) cm(2)/s depending on the DS of the polymers, respectively. (C) 2009 Elsevier Ltd. All rights reserved.