Thermodynamic properties of water in perfluorinated membranes of Nafion and Aquivion types, prepared by emulsion polymerization

Structure characterization of perfluorosulfonic short side chain polymer membranes

“…The studies of relation between the structured (associated with ionic groups) and unstructured (free) water contained in membranes, measured by differential scanning calorimetry, allowed to establish the relationship of the proton conductivity, EW and the amounts of structured and unstructured membrane water. 13 Experiments on small-angle neutron scattering (SANS) were carried out at the facilities "Yellow submarine" (Budapest Neutron Center, BNC, Hungary) in the range of momentum transfer q ¼ (4p/l)sin(q/2) ¼ 0.2-7 nm À1 where q is the scattering angle, neutron wavelength l ¼ 0.3 nm, Dl/l $ 0.1 and "Membrana" (Petersburg Nuclear Physics Institute, PNPI, Russia) at q ¼ 0.04-0.8 nm À1 (l ¼ 0.3 nm, Dl/l $ 0.3). The method involves measuring and analyzing scattering curvesthe relations of neutron scattering cross section dS/dU vs. momentum transfer q.…”

Evaluation of Aquivion® as Recyclable Superacid Solid Catalyst in the Oxidation of Furfurylamines with Hydrogen Peroxide to 3‐Hydroxypyridines

“…For calculating the TOF we evaluated “the number of molecules reacting per active site per time” [33] . The proton conductivity of Aquivion is highly dependent on the water content in its matrix, [34] that contributes to the formation of SO 3 H clusters [35] where two populations of protons may exist, with fast and low diffusion properties that may affect the surface activity [36] . Indeed working in a water environment may give a better catalyst activity.…”

Production of neo acids from biomass-derived monomers

“…Aquivion PW79S is more prone to swelling than Aquivion PW98 due to its higher acid density. 40,41 This phenomenon limits reactant accessibility to the active sites. The formation of water channels can be mitigated simply by performing reactions in a round bottom flask under high stirring speed (Fig.…”