Bis 4 fluorophenyl sulfone

ZnCl₂, SnCl₄, CMME, benzoyl peroxide (BPO), azobisisobutyronitrile (AIBN), N-bromosuccinimide (NBS), 1,1,2,2-tetrachloroethane (TCE), CDCl₃, polysulfone (PSU) random copolymer (average M_n ∼ 22 000), bis(4-fluorophenyl) sulfone (DFDPS), 4,4′-(hexafluoroisopropylidene)diphenol (6F-BPA), 4,4′-dihydroxybiphenyl (BP), methyl iodide, Cs₂CO₃, K₂CO₃, CaCO₃, deuterated chloroform (CDCl₃) and N,N-dimethylsulfoxide (DMSO-d₆), 1-methyl-2-pyrrolidinone (NMP), and N,N-dimethylacetamide (DMAc) were purchased from Sigma-Aldrich. Sodium chloride (NaCl), methanol and hydrochloric acid were supplied by Samchun Chemicals and used as received. Tetra(trimethylaminemethylene)-4,4′-dihydroxydiphenylether (TADHDPE) was synthesized following our previous report.^{27 (link)} The FAA-3-30 membrane was purchased from FUMATECH as a reference AEM, and prior to its use, the counter ion was converted to chloride anion using aqueous 1 M NaCl solution.

Hydroquinone (≥99%), 1,6-dibromoalkane (96%), bis(4-fluorophenyl) sulfone (99%), potassium hydroxide (90%), potassium carbonate (≥99%), sodium dithionite (99%), sodium chloride (≥99%), sodium hydroxide (98%), lead acetate trihydrate (≥99%), phenolphthalein (99%), petroleum ether (≥95%), anhydrous N-methyl-2-pyrrolidone (99.5%), and anhydrous toluene (99.8%) were purchased from Sigma-Aldrich, Inc. (Saint Louis, MO, USA) and used without additional purification. Bis(4-fluoro-3-sulfophenyl)sulfone disodium salt (≥99%) was purchased from Yanjin Technology Co., Ltd. (Tianjin, China). Sulfuric acid solution (5 N), ethanol (99.5%), and isopropanol (99.5%) were purchased from Daejung Co., Ltd. (Siheung, Korea). Prior to synthesis, all monomers and polymers were dried overnight in a vacuum oven at 60 °C. For the single-cell test, a 40 wt.% Pt/C electrocatalyst was purchased from Tanaka Kikinzoku Kogyo Co., Ltd. (Tokyo, Japan). The 5 wt.% Nafion^® ionomer solution and Kapton^® polyimide films were from DuPont Inc. (Wilmington, DE, USA), and Sigracet^® 39BC gas diffusion layers were from SGL Carbon Co. Ltd. (Wiesbaden, Germany).