Synthesis of new monomer 3,3′-diamino-4,4′-bis{p-[(diethoxyphosphoryl)methyl]phenylamino}diphenyl sulfone and polybenzimidazoles on its basis

Poly(N‐phenylenebenzimidazoles), a New Approach for Monomer Synthesis

“…We supposed that the reductive heterocyclization of bis( o ‐nitroanilines) (BisNA) would be a good way to make a shortcut in the BisBI synthesis by avoiding the step of tetraamine formation and purification. BisNA are usually obtained on the penultimate step of the tetraamine synthesis, and they are readily available …”

“…Synthesis was based on the method described in one of our previous works . 4,4′‐Dichlorodiphenylsulfone (57.4 g, 0.2 mol) was dissolved under stirring in 250 mL of concentrated H 2 SO 4 at 80 °C in a 500 mL two‐necked flask equipped with a helical blade stirrer.…”

Design of electrodes based on a carbon nanofiber nonwoven material for the membrane electrode assembly of a polybenzimidazole-membrane fuel cell

“…The synthesis of PBI-O-PHT and the production of membranes based on it were described in detail pre viously [4][5][6][7][8][9]. Testing of seven layer membranes (active area 5 cm 2 ) of the MEA in standard cells (Arbin Instruments) was performed according to a published procedure [7][8][9] using both electrodes made espe cially for this work, and commercial electrodes (PEMEAS Celtec ® Р1000).…”

“…At the Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Moscow, Russia, new competitive MEAs based on the card polymer PBI-O-PHT [4][5][6][7][8][9]:…”

Achievements in polycondensation and condensation polymers

“…On the basis of new sulfonated and phosphorylated PIs, polybenzimidazoles, poly(1,3,4 oxadiazoles), poly(1,2,3 triazoles), polyphenylenes, and poly(arylene oxides), proton conducting membranes were designed and their conductivities, mechanical characteristics, exploitation stabilities, and other properties were studied in detail [288][289][290][291][292][293][294].…”