✦ LIBER ✦

Selective CO oxidation over Pt/alumina catalysts

Publisher: Elsevier Science
Year: 2002
Tongue: English
Weight: 138 KB
Volume: 2002
Category: Article
ISSN: 1464-2859
DOI: 10.1016/s1464-2859(02)08032-x

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✦ Synopsis

Trends Sulfonated poly(arylene ether sulfone) copolymers for PEMs

Here novel biphenol-based wholly aromatic poly(arylene ether sulfone)s containing up to two pendant sulfonate groups per repeat unit were prepared by direct aromatic nucleophilic substitution polycondensation of disodium 3,3'disulfonate-4,4'-dichlorodiphenylsulfone, 4,4'dichlorodiphenylsulfone and 4,4'-biphenol.

Copolymerization proceeded to high molecular weight in N-methyl-2-pyrrolidinone at 190°C. Tough membranes were successfully cast using N,N-dimethylactamide. An increase in sulfonate groups in the copolymer resulted in increased glass transition temperature, and enhanced membrane hydrophilicity and intrinsic viscosity. The new copolymers are candidates as new polymeric electrolyte materials for PEMFCs.

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