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Title: Electropolymerization of a bifunctional ionic liquid monomer yields as electroactive liquid-crystalline polymer.

Abstract

The preparation and polymerization of a bifunctional imidazolium-based ionic liquid (IL) monomer that incorporates both a vinyl group and a thiophene moiety is reported. Potentiodynamic electropolymerization of the monomer produces an optically birefringent polymer film that strongly adheres to the electrode surface. Fourier transform IR spectroscopy shows that polymerization occurs through both the vinyl and thienyl groups. Cylic voltammetry (CV) is used to determine the polymer oxidation potential (1.66 V) and electrochemical bandgap, Eg, of 2.45 eV. The polymer exhibits electrochromism, converting from yellow in the neutral form ({lambda}{sub max} = 380 nm) to blue in the polaronic state at 0.6 V ({lambda}{sub max} = 672 nm) and to blue-grey in the bipolaronic state at 1.2 V ({lambda}{sub max} > 800 nm). Topographic atomic force microscopy (AFM) images reveal isolated (separated) fibrils. Grazing-incidence small-angle X-ray scattering (GISAXS) studies indicate a lamellar structure with a lattice spacing of 3.2 nm. Wide-angle X-ray diffraction (WAXD) studies further suggest that the polymerized thiophene sheets are oriented perpendicular to the polymerized vinylimidazolium. The electrical conductivity, as determined by four-probe dc conductivity measurements was found to be 0.53 S cm{sup -1} in the neutral form and 2.36 S cm{sup -1} in the iodine-doped state, valuesmore » higher than typically observed for polyalkylthiophenes. The structural ordering is believed to contribute to the observed enhancement of the electrical conductivity.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1004039
Report Number(s):
ANL/MSD/JA-66557
Journal ID: 1616-301X; TRN: US201103%%285
DOE Contract Number:  
DE-AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Adv. Funct. Mater.
Additional Journal Information:
Journal Volume: 20; Journal Issue: 13 ; Jul. 9, 2010
Country of Publication:
United States
Language:
ENGLISH
Subject:
36 MATERIALS SCIENCE; ATOMIC FORCE MICROSCOPY; ELECTRIC CONDUCTIVITY; ELECTROCHROMISM; ELECTRODES; MONOMERS; OXIDATION; POLYMERIZATION; POLYMERS; SCATTERING; SPECTROSCOPY; THIOPHENE; X-RAY DIFFRACTION

Citation Formats

Lee, S, Becht, G A, Lee, B, Burns, C T, and Firestone, M A. Electropolymerization of a bifunctional ionic liquid monomer yields as electroactive liquid-crystalline polymer.. United States: N. p., 2010. Web. doi:10.1002/adfm.201000024.
Lee, S, Becht, G A, Lee, B, Burns, C T, & Firestone, M A. Electropolymerization of a bifunctional ionic liquid monomer yields as electroactive liquid-crystalline polymer.. United States. https://doi.org/10.1002/adfm.201000024
Lee, S, Becht, G A, Lee, B, Burns, C T, and Firestone, M A. Fri . "Electropolymerization of a bifunctional ionic liquid monomer yields as electroactive liquid-crystalline polymer.". United States. https://doi.org/10.1002/adfm.201000024.
@article{osti_1004039,
title = {Electropolymerization of a bifunctional ionic liquid monomer yields as electroactive liquid-crystalline polymer.},
author = {Lee, S and Becht, G A and Lee, B and Burns, C T and Firestone, M A},
abstractNote = {The preparation and polymerization of a bifunctional imidazolium-based ionic liquid (IL) monomer that incorporates both a vinyl group and a thiophene moiety is reported. Potentiodynamic electropolymerization of the monomer produces an optically birefringent polymer film that strongly adheres to the electrode surface. Fourier transform IR spectroscopy shows that polymerization occurs through both the vinyl and thienyl groups. Cylic voltammetry (CV) is used to determine the polymer oxidation potential (1.66 V) and electrochemical bandgap, Eg, of 2.45 eV. The polymer exhibits electrochromism, converting from yellow in the neutral form ({lambda}{sub max} = 380 nm) to blue in the polaronic state at 0.6 V ({lambda}{sub max} = 672 nm) and to blue-grey in the bipolaronic state at 1.2 V ({lambda}{sub max} > 800 nm). Topographic atomic force microscopy (AFM) images reveal isolated (separated) fibrils. Grazing-incidence small-angle X-ray scattering (GISAXS) studies indicate a lamellar structure with a lattice spacing of 3.2 nm. Wide-angle X-ray diffraction (WAXD) studies further suggest that the polymerized thiophene sheets are oriented perpendicular to the polymerized vinylimidazolium. The electrical conductivity, as determined by four-probe dc conductivity measurements was found to be 0.53 S cm{sup -1} in the neutral form and 2.36 S cm{sup -1} in the iodine-doped state, values higher than typically observed for polyalkylthiophenes. The structural ordering is believed to contribute to the observed enhancement of the electrical conductivity.},
doi = {10.1002/adfm.201000024},
url = {https://www.osti.gov/biblio/1004039}, journal = {Adv. Funct. Mater.},
number = 13 ; Jul. 9, 2010,
volume = 20,
place = {United States},
year = {2010},
month = {7}
}