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Facile Fabrication and Characterization of Improved Proton Conducting Sulfonated Poly(Arylene Biphenylether Sulfone) Blocks Containing Fluorinated Hydrophobic Units for Proton Exchange Membrane Fuel Cell Applications. | LitMetric

AI Article Synopsis

  • Researchers successfully synthesized sulfonated poly(arylene biphenylether sulfone)-poly(arylene ether) (SPABES-PAE) block copolymers by adjusting the molar ratios of SPABES and PAE oligomers, and compared their performance with Nafion 212 membranes.
  • These membranes showed excellent stability against heat and chemical attacks, along with improved solubility in various solvents, and were flexible and transparent with a thickness of 70-90 μm.
  • The SPABES-PAE (2:1) membrane demonstrated enhanced water retention and proton conductivity, achieving a peak power density of 333.29 mW·cm² at 60 °C and 100

Article Abstract

Sulfonated poly(arylene biphenylether sulfone)-poly(arylene ether) (SPABES-PAE) block copolymers by controlling the molar ratio of SPABES and PAE oligomers were successfully synthesized, and the performances of SPABES-PAE (1:2, 1:1, and 2:1) membranes were compared with Nafion 212. The prepared membranes including fluorinated hydrophobic units were stable against heat, nucleophile attack, and physio-chemical durability during the tests. Moreover, the polymers exhibited better solubility in a variety of solvents. The chemical structure of SPABES-PAEs was investigated by ¹H nuclear magnetic resonance (¹H NMR), Fourier transform infrared spectroscopy (FT-IR), and gel permeation chromatography (GPC). The membrane of SPABES-PAEs was fabricated by the solution casting method, and the membranes were very flexible and transparent with a thickness of 70⁻90 μm. The morphology of the membranes was observed using atomic force microscope and the ionic domain size was proved by small angle X-ray scattering (SAXS) measurement. The incorporation of polymers including fluorinated units allowed the membranes to provide unprecedented oxidative and dimensional stabilities, as verified from the results of ex situ durability tests and water uptake capacity, respectively. By the collective efforts, we observed an enhanced water retention capacity, reasonable dimensional stability and high proton conductivity, and the peak power density of the SPABES-PAE (2:1) was 333.29 mW·cm at 60 °C under 100% relative humidity (RH).

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6401750PMC
http://dx.doi.org/10.3390/polym10121367DOI Listing

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