ChemInform Abstract: SYNTH. VON 3,4‐DIAMINO‐4′‐CARBOXY‐DIPHENYLSULFON UND SEINEM METHYLESTER

Ivanov, A. V.; Gitis, S. S.; Beregovykh, T. M.; Andrianov, V. F.; Kaminskii, A. Ya.

doi:10.1002/chin.197136280

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Monomer Synthesis1

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2013

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“…The monomer, 4-(3,4-diaminophenylsulfonyl)benzoic acid was prepared by Ivanov in 1971 from 4-(4-chlorophenylsulfonyl)benzoic acid, using a nitration-hydrolysis-reduction scheme (23,24). Though its use as a polybenzimidazole monomer was mentioned in these disclosures, no description of polymers or membranes derived from it has been published.…”

Section: Monomer Synthesismentioning

confidence: 99%

Novel Polybenzimidazole-Phosphoric Acid Membranes for Fuel Cell Applications

et al. 2013

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Polybenzimidazole-phosphoric acid membranes have been used extensively in high temperature fuel cell applications. They are generally prepared either by copolymerization of tetramines and dicarboxylic acids (AA/BB copolymers) or by homopolymerization of diaminoacids (AB homopolymers). We describe the preparation of 4-(3,4-diaminophenylsulfonyl) benzoic acid, a diamino acid useful for the synthesis of novel AB polybenzimidazoles having excellent thermal and thermal-oxidative stability. The polymer, readily cast from polar aprotic solvents, when imbibed with phosphoric acid produces polymer electrolyte membranes exhibiting proton conductivities ranging from 0.06-0.12 S/cm at 80-160 {degree sign}C (20% RH) at a phosphoric acid doping level of 6.1.

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Section: Monomer Synthesismentioning

confidence: 99%