Article
Doped polyaniline in Brønsted acid ionic liquid 1-butyl-3-methylimidazolium bis[trifluoromethyl(sulfonyl)]imide/bis[trifluoromethyl(sulfonyl)]imide
Journal of Applied Polymer Science
(2013)
Abstract
We report the preparation and characterization of doped polyaniline (PANI) in an ionic liquid 1-butyl-3-methylimidazolium bis[trifluoromethyl(sulfonyl)]imide (BMImTFSI) medium. Aniline monomer was chemically polymerized via oxidation with KMnO4 in an ionic liquid BMImTFSI solution containing a monoprotic Brønsted acid bis[trifluoromethyl(sulfonyl)]imide (HTFSI). HTFSI is the source of proton that doped PANI. The identity of PANI as the reaction product was confirmed with both ultraviolet–visible and Fourier transform infrared spectra. Unlike syntheses in aqueous media, the doped PANI did not readily precipitate from the ionic liquid; a transparent and stable green solution-like liquid dispersion was obtained (dispersion is used to refer the product hereafter). PANI precipitated when dedoped with organic bases such as triethylamine. The PANI precipitate can be redoped by HCl and the so-doped PANI has conductivity of about 2.0 × 10−2 S/cm. The liquid dispersion of doped PANI in the ionic liquid can be diluted by many organic solvents or other ionic liquids to diluted “solutions.”
Keywords
- polyaniline,
- ionic liquids,
- dispersion
Disciplines
Publication Date
February, 2013
DOI
10.1002/app.37953
Citation Information
Evan Margaretta, Chris Olmeda and Lei Yu. "Doped polyaniline in Brønsted acid ionic liquid 1-butyl-3-methylimidazolium bis[trifluoromethyl(sulfonyl)]imide/bis[trifluoromethyl(sulfonyl)]imide" Journal of Applied Polymer Science Vol. 127 Iss. 4 (2013) p. 2453 - 2457 ISSN: 0021-8995 Available at: http://works.bepress.com/lei-yu/4/