01954nas a2200229   4500008004100000022001400041245010600055210006900161260006800230300001400298490000700312520110700319653001501426653002201441653003501463653001301498100002101511700002101532700002101553700002101574856012901595       2009                        eng d  a0887-624X00aPolybenzimidazoles tethered with N-Phenyl 1,2,4-triazole units as polymer electrolytes for fuel cells0 aPolybenzimidazoles tethered with NPhenyl 124triazole units as po  a111 RIVER ST, HOBOKEN, NJ 07030 USAbJOHN WILEY & SONS INCcMAY  a2289-23030 v473 a<p>Polybenzimidazole (PBI) polymers tethered with N-phenyl 1,2,4-triazole (NPT) groups were prepared from a newly synthesized aromatic diacid, 3'-(4-phenyl-4H-1,2,4-triazole-3,5-diyl) dibenzoic acid (PTDBA). The obtained polymers show superior thermal and chemical stability and good solubility in many aprotic solvents. The inherent viscosities of all polymers were around 1 dL/g. They exhibit high thermal stability with initial decomposition temperature ranging from 515 to 530 degrees C, high glass transition temperature ranging from 375 to 410 degrees C, and good mechanical properties with tensile stress in the range of 66-98 MPa and modulus 1897-2600 MPa. XRD analysis indicates that these polymers are amorphous in nature. PhysicochemiCal properties such as water and phosphoric acid-uptake, oxidative stability, and proton conductivity of membranes of these polymers have also been determined. The proton conductivity ranged from 4.7 x 10(-3) to 1.8 x 10(-2) S cm(-1) at 175 degrees C in dry conditions. (C) 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 2289-2303, 2009</p>10afuel cells10aPolybenzimidazole10asynthesis and characterization10aTriazole1 aPotrekar, R., A.1 aKulkarni, M., P.1 aKulkarni, R., A.1 aVernekar, S., P.  uhttps://library.ncl.res.in/content/polybenzimidazoles-tethered-n-phenyl-124-triazole-units-polymer-electrolytes-fuel-cells-0