Molecular mass characteristics and solution behavior of some cardo polybenzimidazoles

Synthesis of high performance phenolphthalein-based cardo poly(ether ketone imide)s via aromatic nucleophilic substitution polymerization

“…Phenolphthalein, which is a kind of commercially available industrial product and can easily be synthesized from phenol and phthalic anhydride [3], is a common pharmaceutical raw material and an important acid-base indicator in analytical chemistry. Many high performance polymers with phenolphthalein-based cardo groups have been synthesized, including poly(arylene ether sulfone)s (PES-C) [4][5][6][7][8][9][10][11][12][13][14], poly(arylene ether ketone)s (PEK-C) [15][16][17][18][19][20][21], poly(benzimidazole) [22,23], and polyetheroxadiazoles [24]. Among these high performance engineering plastics, PES-C and PEK-C, which possessed good solubility, high glass transition temperature, light-colored and fairly transparent optical properties, good thermal-oxidative stability as well as excellent mechanical toughness, have been industrialized in china and widely used in many applications such as aerospace field, microelectronic area, national defense industry, wire enamels, sterilizable medical equipment, and others [13][14][15].…”

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

“…It was found that, dur ing polycondensation in such media, there is a side acylation reaction, which gives rise to branched and, as a consequence, partially crosslinked polymers [85]. The use of ionic liquids as reaction media made it possible to synthesize high molecular mass aromatic poly(1,3,4 oxadiazoles) via the one step method [86,87].…”