Journal
MACROMOLECULES
Volume 42, Issue 22, Pages 8711-8717Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ma901606z
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Funding
- National Basic Research Program of China [2009CB623401]
- National Science Foundation of China [20802071, 50825302, 5067308]
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A new bisphenol monomer, 2,2'-dimethylaminemetllylene-4,4'-biphenol (DABP), was easily prepared by Mannich reaction of dimethylamine and formaldehyde with 4,4'-biphenol. Novel partially fluorinated poly(arylene ether sulfone)s with pendant quaternary ammonium groups were prepared by copolymerization of DABP, 4,4'-biphenol, and 3,3',4,4'- tetrafluorodiphenylsulfone, followed by reaction with iodomethane. The resulting copolymers PSQNI-x (where x represents the molar fraction of DABP in the feed) with high molecular weight exhibited outstanding solubility in polar aprotic solvents; thus, the flexible and tough membranes of PSQNI-x with varying ionic content could be prepared by casting from the DMAc solution. Novel anion exchange membranes, PSQNOH-x, were obtained by an anion exchange of PSQNI-x with 1 N NaOH. All PSQNOH-x membranes showed conductivities above 10(-2) S cm(-1) at room temperature, for example, the hydroxide conductivity of PSQNOH-90 achieved to 8.4 x 10(-2) S cm(-1), which was thus comparable to the proton conductivity of Nafion 117 (i.e., 9.0 x 10(-2) S cm(-1)).
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