Effect of Chain Extender on the Properties of Polysulfone-Based Membrane as a Candidate for Fuel Cell Proton Exchange Membrane
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Proton exchange membrane is a key component in fuel cell system with major impact on the performance. So tuning polymer structure to obtain the best properties and performance has been attracted many attentions. In this research two types of sulfonated polysulfone (sPSU) based on bisphenol AF, bisfluorophenyl sulfone (BFPS), and sulfonated bisfluorophenyl sulfone (sBFPS) in the presence or absence of decafluorobiphenyl (DFBP) as chain extender with 30 wt% degree of sulfonation (DS) were synthesized. FTIR and 1H NMR analyses, DSC, TGA, and tensile tests confirmed successful synthesis and acceptable properties of sulfonated monomer and polymers. Suitable membranes were obtained from the prepared polymers. Water uptake and IEC measurements, MEA preparation, and performance of membranes were evaluated. Besides these, presence or absence of DFBP in two synthesized structures was compared.
KeywordsPolysulfone Synthesis Chain extender Fuel cell