Abstract
A series of copolymer electrolytes containing ODA-based sulfonated polyimide and siloxane segments in various ratios were prepared and characterized for direct methanol fuel cell applications. The prepared copolymer electrolyte membranes were flexible and showed good thermal stability as well as proton conductivity. A maximum proton conductivity of 5.78×10-2 S/cm was obtained for the SPI_DSX75 membrane at 90 åC. The transport properties of the membranes were found to be strongly influenced by water uptake and the number and nature of the ionic clusters in the hydrophilic domains. TEM analysis showed evidences for the phase segregation in the membranes and revealed the influence of flexible siloxane segments in ionic clustering.
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