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Electrochemical polymerization of imidazolum‐ionic liquids bearing a pyrrole moiety
Authors:Weixia Zhang  Yan Li  Changxu Lin  Qi An  Chengan Tao  Yongbing Gao  Guangtao Li
Affiliation:Key Laboratory of Organic Optoelectronic and Molecular Engineering, Department of Chemistry, Tsinghua University, 100084 Beijing, China
Abstract:A series of imidazolium‐based ionic liquid monomers bearing a terminal pyrrole moiety were synthesized and electrochemically polymerized. It is found that the polymerizability of the synthesized ionic liquids is strongly dependent on the type of the counteranions. Although bromide monomer is not polymerizable, well‐defined polymeric films can be formed on various substrates in the cases of flour‐containing anions (BF4?, PF6?). The performed characterizations show that all resulting polypyrrole films are electroactive, and the imidazolium‐based ionic liquid moieties are correctly incorporated in polymer films during the electropolymerization process. This work not only provides a facile new method to immobilize ionic liquids on solid surface. Interestingly, without use of any template unique “knit” morphology and nanostructure, even hierarchical structures could also be produced by the electropolymerization of these new functionalized pyrrole monomers. We found that the properties of the pendant ionic liquid units on the surface of the formed polymer films preserved, and by simple anion exchange their surface energy and tension could be easily tuned without loss of the electrical, optical properties, and morphology of the polypyrrole films. © 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 4151–4161, 2008
Keywords:anion exchange  electropolymerization  ion exchangers  microstructure  morphology  polyelectrolytes  polymeric ionic liquids  polypyrrole  redox polymers  TEM
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