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Increased conductivity of polymerized ionic liquids through the use of a nonpolymerizable ionic liquid additive

Published online by Cambridge University Press:  08 November 2013

Kaija Põhako-Esko ,
Martin Timusk ,
Kristjan Saal ,
Rünno Lõhmus ,
Ilmar Kink  and
Uno Mäeorg
Kaija Põhako-Esko*
Affiliation:
University of Tartu, Institute of Chemistry, 50411 Tartu, Estonia; and University of Tartu, Institute of Physics and Estonian Nanotechnology Competence Center, 51014 Tartu, Estonia
Martin Timusk
Affiliation:
University of Tartu, Institute of Physics and Estonian Nanotechnology Competence Center, 51014 Tartu, Estonia
Kristjan Saal
Affiliation:
University of Tartu, Institute of Physics and Estonian Nanotechnology Competence Center, 51014 Tartu, Estonia
Rünno Lõhmus
Affiliation:
University of Tartu, Institute of Physics and Estonian Nanotechnology Competence Center, 51014 Tartu, Estonia
Ilmar Kink
Affiliation:
University of Tartu, Institute of Physics and Estonian Nanotechnology Competence Center, 51014 Tartu, Estonia
Uno Mäeorg
Affiliation:
University of Tartu, Institute of Chemistry, 50411 Tartu, Estonia
*
a)Address all correspondence to this author. e-mail: kaija.pohako@ut.ee
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Abstract

In the present study, polymerizable ionic liquids (ILs), 1-[n-(methacryloyloxy)alkyl]-3-methylimidazolium bromides (n = 2, 6, 7, or 10), were synthesized in high yields. Moreover, the compounds obtained (n = 6, 7, or 10) were used in the preparation of composite materials comprising a polymerized IL matrix and a nonpolymerizable IL additive, 1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIM][BF4]) in various proportions (up to 75% vol/vol of [EMIM][BF4]). The UV-radiation-initiated photopolymerization process was monitored in situ by measuring the resistivities of the mixtures. An increase in [EMIM][BF4] content in the composites led to an increase in the ionic conductivities of the materials while retaining their solid state at levels as high as 40% vol/vol of the [EMIM][BF4] content. The 40% vol/vol composites had conductivities of approximately 10−4 S/cm compared to the conductivities of 10−5 S/cm for the corresponding neat polymerized ILs. Above this [EMIM][BF4] content, the materials were sticky gels, and from 50% vol/vol onwards, entirely liquid.

Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 22 , 28 November 2013 , pp. 3086 - 3093
Copyright
Copyright © Materials Research Society 2013 

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