02154nas a2200253   4500008004100000022001400041245012500055210006900180260006800249300001400317490000800331520122500339653002101564653001401585653003101599653002301630653002401653653001401677100002101691700002301712700002101735700002101756856012301777       2010                        eng d  a0021-899500aNitrophenoxy groups containing polybenzimidazoles as polymer electrolytes for fuel cells: synthesis and characterization0 aNitrophenoxy groups containing polybenzimidazoles as polymer ele  a111 RIVER ST, HOBOKEN, NJ 07030 USAbJOHN WILEY & SONS INCcSEP  a3282-32920 v1173 a<p>Polybenzimidazoles containing different contents of pendant nitrophenoxy groups were prepared by condensation of 3,3'-diamino-benzidine with a mixture of 3,5-dicarboxyl-4'-nitro diphenyl ether and isophthalic acid (IPA) in different ratios in polyphosphoric acid. The polymers are soluble in polar aprotic solvents, they have inherent viscosities in the range of 0.75-1.10 dL g(-1) and they form tough and transparent films on solution casting. They have good thermal stability with initial decomposition temperature ranging from 380 to 416 degrees C in nitrogen, good tensile strength ranging from 56 to 65 MPa and reasonably good oxidative stability. Phosphoric acid uptake of these polymers is low compared with PBI and membranes doped with phosphoric acid exhibit good proton conductivity in the range of 6.6x 10(-3) to 1.9x 10(-2) S/cm at 25 degrees C and 1.2x 10(-2) to 4.9x 10(-2) S/cm at 175 degrees C, compared with 3.9x 10(-3) S/cm at 25 degrees C and 3.2x 10(-2) S/cm at 175 degrees C for PBI. These membranes are suitable for applications as polymer electrolyte for fuel cell and presumably for gas separation at high temperature. (C) 2010 Wiley Periodicals, Inc. J Appl Polym Sci 117: 3282-3292, 2010</p>10aCharacterization10amembranes10apendant nitrophenoxy group10apolybenzimidazoles10aproton conductivity10asynthesis1 aKulkarni, Mahesh1 aPotrekar, Ravindra1 aKulkarni, R., A.1 aVernekar, S., P.  uhttps://library.ncl.res.in/content/nitrophenoxy-groups-containing-polybenzimidazoles-polymer-electrolytes-fuel-cells-0