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Tsang, Ming Wai
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document
Graft copolymer blends as proton exchange membranes for PEM fuel cells
Abstract
Polymer blended membranes containing partially sulfonated poly([vinylidene difluoride-co-chlorotrifluoroethylene]-g-styrene) [P(VDF-co-CTFE)-g-SPS] and polyvinylidene difluoride (PVDF) were prepared to examine the effect of blending on the PEM properties. The graft ionomer having IEC ∼ 2.91 mmol/g was blended with different molecular weights of PVDF in a mass ratio of 70/30. The significantly reduced water uptake observed in the graft blends allows for higher levels of acid concentration, without a significant decline in proton mobility, which has an overall positive impact on proton conductivity. The blended membrane mixing with 270,000 g/mol PVDF even performs a factor of two increase in conductivity relative to the pristine graft copolymer. Blending with a higher molecular weight of PVDF may greatly enhense phase separation, decreasing the tortuosity of ionic pathways for better proton transport. Consequently, blending provides a solution for the design of a PEM with maximum conductivity at minimum water content, all the while enhancing membrane mechanical strength.