02279nas a2200265   4500008004100000022001400041245009900055210006900154260006800223300001400291490000700305520131400312653002101626653002501647653003001672653003101702653003101733653002301764653001401787100002101801700002301822700002101845700002101866856012601887       2008                        eng d  a0887-624X00aSynthesis and characterization of novel polybenzimidazoles bearing pendant phenoxyamine groups0 aSynthesis and characterization of novel polybenzimidazoles beari  a111 RIVER ST, HOBOKEN, NJ 07030 USAbJOHN WILEY & SONS INCcSEP  a5776-57930 v463 a<p>A novel aromatic diacid, 3, 5-dicarboxyl-4'-amino diphenyl ether, containing pendant phenoxy amine group was synthesized. Homo- and co-polybenzimidazoles containing different content of pendant phenoxyamine groups were synthesized by condensation of 3,3'-diaminobenzidine with this acid and a mixture of this acid and isophthalic acid in different ratio in polyphosphoric acid. Copolybenzimidazoles with structural variations were also synthesized based on this acid and pyridine dicarboxylic acid, terephthalic acid, adipic acid, or sebacic acid. The polymers have good solubility in polar aprotic solvents and strong acids and they form tough flexible films by solution casting. The polymers were characterized by different instrumental techniques (FTIR, TGA, DSC, XRD, etc.) and for solvent solubility, mechanical properties, inherent viscosity, and proton conductivity. The inherent viscosities of the polymers vary in the range of 0.62-1.52 dL/g. They have high thermal stability up to 475506 degrees C (IDT) in nitrogen, high glass transition temperatures (T-g) ranging from 313 to 435 degrees C and good tensile strength ranging from 58 to 125 MPa. Proton conductivity of homo polymer is 3.72 x 10(-3) S/cm at 25 degrees C and 2.45 x 10(-2) S/cm at 200 degrees C (c) 2008 Wiley Periodicals, Inc.</p>10aCharacterization10acopolybenzimidazoles10aHigh performance polymers10ahigh temperature materials10apendant phenoxyamine group10apolybenzimidazoles10asynthesis1 aKulkarni, Mahesh1 aPotrekar, Ravindra1 aKulkarni, R., A.1 aVernekar, S., P.  uhttps://library.ncl.res.in/content/synthesis-and-characterization-novel-polybenzimidazoles-bearing-pendant-phenoxyamine-0