期刊
POLYMERS FOR ADVANCED TECHNOLOGIES
卷 19, 期 10, 页码 1369-1382出版社
WILEY-BLACKWELL
DOI: 10.1002/pat.1200
关键词
polythiophene; ionic liquids; SAXS; self-assembly
资金
- Office of Basic Energy Sciences, Division of Materials Sciences, United States
- Department of Energy [DE-AC02-06CH11357]
Preparation and polymerization of methylimidazolium-based ionic liquids (ILs) that incorporate a thiophene moiety at the terminus of a C,() alkyl chain are described. Both a bromide and nitrate salt of the amphiphilic thiophene IL self-assembles in water (albeit the nitrate to a lesser extent), adopting columnar mesophases. Polarized optical microscopy and small-angle X-ray scattering (SAXS) studies show that at low water content the IL-water binary mixtures form liquid crystalline mesophases possessing significant short-range ordering due to strong pi interactions between adjacent thiophene moieties. At higher water content, the short-range ordering is lost, but long-range ordering persists up to ca. 45% (w/w) water. The chemical oxidative coupling of the nitrate monomer yields a highly water-soluble polymer. Electrochemical studies show that the polymer possesses a high oxidation potential (1.935V) and thus, is resistant to chemical doping. In dilute aqueous solution, electronic absorption spectroscopy and X-ray scattering show the polymer adopts a random, coil-like conformational state. Slight improvement in the polymer conformation can be achieved by exchange of the counter anion. Copyright (C) 2008 John Wiley & Sons, Ltd.
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