Chinese Journal of Applied Chemistry

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Synthesis of Side-chain-sulfonated Poly(ether ether ketone) as Cation Exchange Membranes by Atom Transfer Radical Polymerization

HUANG Xuehong, LIN Juan, ZHENG Ronxue, LIN Yifeng, DING Fuchuan*, LING Qidan*   

  1. (Fujian Key Laboratory of Polymer Materials,College of Materials Science and Engineering,Fujian Normal University,Fuzhou 350007,China)
  • Received:2013-08-04 Revised:2014-03-02 Published:2014-08-10 Online:2014-08-10
  • About author: 
    LING Qidan, professor; Tel: 0591-83464353; Fax: 0591-83464353; E-mail: qdling@ fjnu.edu.cn; Research interests: Optoelectric polymer

Abstract: Poly(ether ether ketone)(PEEK) was synthesized by the aromatic nucleophilic polycondensation reaction of 4,4′-difluorobenzophenone, bisphenol A and 2-methylhydroquinone. Double-arm PEEK macroinitiator containing isopropyl bromide end groups was obtained by bromination with N-bromosuccinimide(NBS), hydroxylation with dimethylol propionate sodium and esterification reaction with bromo-2-methylpropionyl bromide. The membranes of PEEK-g-StSO3Na were prepared by solution casting. A mixed solvent of water and N-methyl-2-pyrrolidone(NMP) was used to design the membrane morphology. The structure and morphology of PEEK-g-StSO3Na membranes were characterized by FT-IR, 1H NMR, TGA and SEM. The synthesized PEEK-g-StSO3Na was found to improve hydrophilic/hydrophobic phase separation. With the increase of the grafting density of StSO3Na, the ion exchange capacity(IEC) increases from 0.643 to 2.034 mmol/g and the conductivities of the membrane is 8.34×10-2 S/cm. The PEEK-g-StSO3Na membranes have higher proton conductivities and lower swelling ratio than Nafion 117.

Key words: atom transfer radical polymerization, poly(ether ether ketone), cation exchange membrane, sodium p-styrenesulfonate

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