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:
Branched sulfonated poly(ether sulfone-ketone) copolymer was prepared with bisphenolA, 4,4-difluorobenzophenone, sulfonated chlorophenyl sulfone (40mole% of bisphenol A) andTHPE (1,1,1-tris-p-hydroxyphenylethane) as a branching agent. THPE was used 0.4 mol% ofbisphenol A to synthesize branched copolymers. Organic-inorganic nano composite membraneswere prepared with copolymer and a series of SiO2 nanoparticles (20 nm, 4, 7 and 10 wt%). Thecomposite membranes were cast from dimethylsulfoxide solutions. The films were converted fromthe salt to acid forms with dilute hydrochloric acid. The membranes were studied by differentialscanning calorimetry (DSC) and thermogravimetric analysis (TGA). Sorption experiments wereconducted to observe the interaction of sulfonated polymers with water and methanol. Branchedcopolymer and nano composite membranes exhibited proton conductivities from 1.12x10-3 to6.04x10-3 S/cm2, water uptake from 52.9 to 62.4%, IEC from 0.81 to 1.21 meq/g and methanoldiffusion coefficients from 1.2x10-7 to 1.5x10-7 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.534-536.121.pdf
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