Hits:

Indexed by:期刊论文

Date of Publication:2008-11-01

Journal:EUROPEAN POLYMER JOURNAL

Included Journals:SCIE、EI、Scopus

Volume:44

Issue:11

Page Number:3782-3789

ISSN No.:0014-3057

Key Words:Proton exchange membrane; Sulfonated polyimides; Fuel cell; Phthalazinone

Abstract:A novel sulfonated diamine,1,2-dihydro-2-(3-sulfonic-4-aminophenyl)-4-[4-(3-sulfonic-4-aminophenoxy)-phenyl]-phthalazin-1-one(S-DHPZDA), was successfully synthesized and two series of six-membered sulfonated polyimides (SPIs) were prepared from 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTDA), S-DHPZDA, and nonsulfonated diamines DHPZDA or 4,4'-diaminodiphenyl ether (ODA). The chemical structure of the S-DHPZDA and the SPIs were characterized by (1)H NMR and FT-IR. Tough, brownish and transparent membranes were cast from SPts' solution in NMP. The water uptake, swelling ratio, chemical and thermal stability, hydrolytic and oxidative stability as well as proton conductivity of these new polymers were investigated systematically. Compared with Nations, the obtained SPI membranes have onset decomposed temperatures of these two series SPIs were above 318 C and decomposed temperature of main chain were 565 C and excellent dimension stabilities on similar IECs. Introduction of phthalazinone moieties had improved the copolyimides' solubility in polar aprotic organic solvents like m-cresol, NMP, DMSO, DMF etc. The SPIs had high proton conductivity (a) in the order of magnitude of 10(-3) to 10(-2) S cm(-1) depending on the degree of sulfonation (DS) of the polymers. (C) 2008 Elsevier Ltd. All rights reserved.