Journal of Polymer Science, Part A: Polymer Chemistry p. 2579 - 2587 (2014)
Update date:2022-08-10
Topics:
Lee, Hsu-Feng
Wang, Po-Hsun
Huang, Yi-Chiang
Su, Wen-Hung
Gopal, Ram
Lee, Chun Che
Holdcroft, Steven
Huang, Wen-Yao
A series of sterically-encumbered, sulfonated, poly(arylene ether) copolymers were synthesized and their proton conductivity examined. The series was prepared by copolymerizing a novel monomer, 2″,3″,5″, 6″-tetraphenyl-[1,1′:4',1″:4″,1″':4″', 1″″-quinquephenyl]-4,4″″-diol, with 4,4'- difluorobenzophenone and bisphenol A. Subsequent sulfonation and solution casting provided membranes possessing ion exchange capacities of 1.9 to 2.7 mmol/g and excellent mechanical properties (Young's modulus, 0.2-1.2 GPa; tensile strength, 35-70 MPa; elongation at break, 62-231%). Water uptake ranged from 34 to 98 wt% at 80 °C/100% RH. Proton conductivities ranged between 0.24 to 16 mS/cm at 80 °C/60% RH, and 3 to 167 mS/cm at 80 °C/95% RH. TEM analysis of the polymers, in the dehydrated state, revealed isolated spherical aggregates of ions, which presumably coalesce when hydrated to provide highly conductive pathways. The strategy of using highly-encumbered polymer frameworks for the design of mechanically-robust and dimensionally-stable proton conducting membranes is demonstrated. 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014, 52, 2579-2587 Sulfonated, multiphenylated, random copolymers of poly(arylene ether)s were synthesized for examination as proton-conducting membranes. Proton conductivities ranged from 3 to 167 mS/cm at 80 °C/95% RH. The highly-encumbered polymer framework conferred exceptional mechanical strength and dimensional stability. Copyright
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