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Molecular Weight Effect of Partially Sulfonated PS-b-PDMS Diblock Copolymers as Proton Exchange Membrane for Direct Methanol Fuel Cell

Title
Molecular Weight Effect of Partially Sulfonated PS-b-PDMS Diblock Copolymers as Proton Exchange Membrane for Direct Methanol Fuel Cell
Authors
Kim, SPark, HWLee, HCHANG, TAIHYUNLee, W
POSTECH Authors
CHANG, TAIHYUN
Date Issued
Dec-2014
Publisher
Springer
Abstract
Partially sulfonated polystyrene-b-poly(dimethylsiloxane) (sPS-b-PDMS) block copolymer membranes were prepared using three different polymers with various molecular weights and block ratios. Eleven different products were obtained with controlled degree of sulfonation (DS) of PS block ranging from 22% to 48%, and they were cast into proton exchange membranes (PEMs). Each PEM was rigorously characterized to see the effect of molecular weight and PS content to PEM for direct methanol fuel cells (DMFC). The first set of sPS-b-PDMS with the highest molecular weight and 50% PS block ratio generally showed high mechanical strength and selectivity (proton conductivity/ methanol permeability), and the second set with medium molecular weight and 60% PS ratio showed high proton conductivity. The last PEM with the lowest molecular weight and 80% PS ratio exhibited a poor tensile strength which is not suitable for PEM application. When the membrane/electrode assemblies (MEAs) were fabricated using the sPS-b-PDMS PEMs with moderately high DS (similar to 40%), one from the second set (moderate molecular weight, 60% PS content) showed the best power performance (90 mW/cm(2) at 70 A degrees C) in active mode DMFC operation, which was found to be 20% higher than that of Nafion 115 MEA.
URI
http://oasis.postech.ac.kr/handle/2014.oak/27166
DOI
10.1007/S13233-014-2189-4
ISSN
1598-5032
Article Type
Article
Citation
MACROMOLECULAR RESEARCH, vol. 22, no. 12, page. 1337 - 1343, 2014-12
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 CHANG, TAIHYUN
Div of Advanced Materials Science
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