ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Novel bisphenol-based wholly aromatic sulfonated poly(ether sulfone-ketone) copolymerand organic-inorganic composite membranes were prepared for operation 80°C in polymerelectrolyte membrane fuel cell (PEMFCs). The copolymer were synthesized by direct aromaticnucleophilic substitution polycondensation of 4,4-difluorobenzophenone, 2,2’-disodiumsulfonyl-4,4’-fluorophenylsulfone (40mole% of bisphenol A) and bisphenol A. Polymerization proceededquantitatively to high molecular weight in N-methyl-2-pyrrolidinone at 180°C. Organic-inorganiccomposite membranes were obtained by mixing organic polymers with hydrophilic SiO2 obtainedby sol-gel process. The polymer and a series of composite membranes were studied by FT-IR,1HNMR, differential scanning calorimetry (DSC) and thermal stability. The proton conductivity asa function of temperature decreased as SiO2 content increased, but methanol permeabilitydecreased. The nano composite membranes were found to poses all requisite properties; Ionexchange capacity (1.2meq./g), glass transition temperatures (164-183[removed info]), and low affinity towardsmethanol (4.63-1.08x10-7 cm2/S)
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.534-536.97.pdf
