3 3 hexafluoro 2 propanol hfip

Pebax^®2533 grade (Figure 1), a block copolymer of poly (tetramethylene oxide) (PTMO, 84 wt.%) and polyamide (PA12, 12 wt.%), was received in pellets from Arkema, Rho, Italy.
Ethanol (absolute, VWR), i-propanol (99.5%, Carlo Erba Reagenti), 1-butanol (99.5%, Carlo Erba Reagenti), and 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP, Sigma-Aldrich) were used as solvents without further purification to dissolve the polymer. The solvents used, with some physical properties, are listed in Table 1. The 1,8-dihydroxy-9-anthrone (dithranol) was purchased from Sigma-Aldrich. The gases for the permeation tests (nitrogen, oxygen, methane, helium, hydrogen, and carbon dioxide, all with purity of 99.99+%) were supplied by SIAD, Bergamo, Italy.

HBF₄ (48% in H₂O), 4-dodecylaniline (97%), 4-ethylaniline (98%), NaNO₂ (97.0%), acetic acid (≥99.7%), propionic acid (≥99.5%), acetonitrile (≥99.9%), tetrabutylammonium tetrafluoroborate (>99%), dihexadecyl phosphate (DHP), bis(2-ethylhexyl) phosphate (BEHP), potassium hexacyanoferrate(III) K₃[Fe(CN)₆], potassium hexacyanoferrate (II) trihydrate, K₂[Fe(CN)₆], (≥99.5%), 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP, ≥99.9%), ruthenium hexamine [Ru(NH₃)₆]³⁺, and phosphate buffered saline (PBS) tablets were obtained from Sigma-Aldrich (Oakville, ON, Canada). Hydrochloric acid (Reagent grade) was obtained from Caledon Laboratories Ltd. (Georgetown, ON, Canada). All solutions were prepared with deionized water obtained with a Millipore system (Woodbine, ON, Canada) after filtration with 0.4 µm filters. Nitrogen gas (99.999% purity) for electrochemical experiments was purchased from Air Liquide (Mississauga, ON, Canada).