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Title: Patterning a π-conjugated polyelectrolyte through sequential polymerization of a bifunctional ionic liquid monomer

Abstract

An electronically conductive polyelectrolyte is prepared by the sequential polymerization of a bifunctional imidazolium-based ionic liquid (IL) monomer, composed of a thienyl and vinyl containing cation paired with a tetrafluoroborate anion. In the first step, potentiodynamic electropolymerization of the thienyl moiety forms a cationic polyalkylthiophene that is soluble in select organic solvents. Cyclic voltammetry (CV) was used to determine the polymer p-doping potential (0.31 V) and the bipolaronic state (1.49 V). The polymer exhibits electrochromism, converting from red in the neutral state (lambda(max) = 443 nm) to dark blue in the polaronic state (lambda(max) = 819 nm). The solution-processable polymer can be cast into a film, masked and patterned by UV-initiated free radical polymerization of the vinyl moiety. Small-angle X-ray scattering (SAXS) revealed that the insoluble crosslinked polyalkylthiophene-polyvinylimidazolium adopts a lamellar structure with a lattice spacing of 3.3 nm. Four-probe d.c. conductivity measurements determined the de-doped electrical conductivity was 1.0 x 10(-2) S/cm. The results underscore the importance of the anion in controlling the polymerization of IL monomers.

Authors:
; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
Los Alamos National Laboratory (LANL); Sandia National Laboratory; USDOE Office of Science - Office of Basic Energy Sciences - Materials Sciences and Engineering Division
OSTI Identifier:
1352845
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Polymer; Journal Volume: 55; Journal Issue: 16
Country of Publication:
United States
Language:
English
Subject:
Ionic liquid; Sequential polymerization; p-Conjugated polyelectrolyte

Citation Formats

Brombosz, Scott M., Seifert, Sönke, and Firestone, Millicent A.. Patterning a π-conjugated polyelectrolyte through sequential polymerization of a bifunctional ionic liquid monomer. United States: N. p., 2014. Web. doi:10.1016/j.polymer.2014.04.049.
Brombosz, Scott M., Seifert, Sönke, & Firestone, Millicent A.. Patterning a π-conjugated polyelectrolyte through sequential polymerization of a bifunctional ionic liquid monomer. United States. doi:10.1016/j.polymer.2014.04.049.
Brombosz, Scott M., Seifert, Sönke, and Firestone, Millicent A.. Fri . "Patterning a π-conjugated polyelectrolyte through sequential polymerization of a bifunctional ionic liquid monomer". United States. doi:10.1016/j.polymer.2014.04.049.
@article{osti_1352845,
title = {Patterning a π-conjugated polyelectrolyte through sequential polymerization of a bifunctional ionic liquid monomer},
author = {Brombosz, Scott M. and Seifert, Sönke and Firestone, Millicent A.},
abstractNote = {An electronically conductive polyelectrolyte is prepared by the sequential polymerization of a bifunctional imidazolium-based ionic liquid (IL) monomer, composed of a thienyl and vinyl containing cation paired with a tetrafluoroborate anion. In the first step, potentiodynamic electropolymerization of the thienyl moiety forms a cationic polyalkylthiophene that is soluble in select organic solvents. Cyclic voltammetry (CV) was used to determine the polymer p-doping potential (0.31 V) and the bipolaronic state (1.49 V). The polymer exhibits electrochromism, converting from red in the neutral state (lambda(max) = 443 nm) to dark blue in the polaronic state (lambda(max) = 819 nm). The solution-processable polymer can be cast into a film, masked and patterned by UV-initiated free radical polymerization of the vinyl moiety. Small-angle X-ray scattering (SAXS) revealed that the insoluble crosslinked polyalkylthiophene-polyvinylimidazolium adopts a lamellar structure with a lattice spacing of 3.3 nm. Four-probe d.c. conductivity measurements determined the de-doped electrical conductivity was 1.0 x 10(-2) S/cm. The results underscore the importance of the anion in controlling the polymerization of IL monomers.},
doi = {10.1016/j.polymer.2014.04.049},
journal = {Polymer},
number = 16,
volume = 55,
place = {United States},
year = {Fri Aug 01 00:00:00 EDT 2014},
month = {Fri Aug 01 00:00:00 EDT 2014}
}