Synthesis and molecular-mass characteristics of some cardo poly(benzimidazoles)

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]:…”

A Green, Expeditious, One-Pot Synthesis of 3, 4-Dihydropyrimidin-2(1H)-ones Using a Mixture of Phosphorus Pentoxide-Methanesulfonic Acid at Ambient Temperature

“…McGarry and Detty successfully used this reagent in cycloacylation reactions for producing chromones and flavones [3]; recently, Zewge and coworkers used Eaton's reagent to promote the cyclization of aniline derivatives to produce 4-quinolones [4]. P 2 O 5 /MeSO 3 H offers a simple means of producing poly(benzimidazoles) from o-phenylenediamines and aromatic carboxylic acids [5]. Kaboudin and Abedi employed this system for synthesis of aryl mesylates [6].…”