Bent-core liquid crystal elastomers

Rafael Verduzco; Paul Luchette; Seung Ho Hong; John Harden; Elaine DiMasi; Peter Palffy-Muhoray; S. Michael Kilbey II; Samuel Sprunt; Jim T. Gleeson; Antal Jákli

doi:10.1039/C0JM01920H

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Journal of Materials Chemistry

Issue 39, 2010

Journal of Materials Chemistry was published between 1991 and 2012. From issue 1, 2013, it was replaced by three new journals: Journal of Materials Chemistry A, B and C

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Paper

Bent-core liquid crystal elastomers

Rafael Verduzco,*^a Paul Luchette,^b Seung Ho Hong,^c John Harden,^b Elaine DiMasi,^d Peter Palffy-Muhoray,^b S. Michael Kilbey II,^a^e Samuel Sprunt,^c Jim T. Gleeson^c and Antal Jákli^b

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Corresponding authors

Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, USA

Chemical Physics Interdisciplinary Program and Liquid Crystal Institute, Kent State University, Kent, USA
E-mail: mpalffy@cpip.kent.edu ;
Fax: +330-672-2959 ;
Tel: +330- 672-2246

Department of Physics, Kent State University, Kent, USA
E-mail: ssprunt@kent.edu ;
Tel: +330-672-2682

National Synchrotron Light Source, Brookhaven National Laboratory, Upton, USA
E-mail: dimasi@bnl.gov

Department of Chemistry, University of Tennessee, Knoxville, USA
E-mail: mkilbey@ion.chem.utk.edu

J. Mater. Chem., 2010,20, 8488-8495

DOI: 10.1039/C0JM01920H
Received 16 Jun 2010, Accepted 28 Jul 2010
First published online 27 Aug 2010

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Abstract
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Liquid crystal (LC) elastomers with bent-core side-groups incorporate the properties of bent-core liquid crystals in a flexible and self-supporting polymer network. Bent-core liquid crystal elastomers (BCEs) with uniform alignment were prepared by attaching a reactive bent-core LC to poly(hydrogenmethylsiloxane) and crosslinking with a divinyl crosslinker. Phase behavior studies indicate a nematic phase over a wide temperature range that approaches room temperature, and thermoelastic measurements show that these BCEs can reversibly change their length by more than a factor of two upon heating and cooling. Small-angle X-ray scattering studies reveal multiple, broad low-angle peaks consistent with short-range smectic C order of the bent-core side groups. A comparison of these patterns with predictions of a Landau model for short-range smectic C order shows that the length scale for smectic ordering in BCEs is similar to that seen in pure bent-core LCs. The combination of rubber elasticity and smectic ordering of the bent-core side groups suggests that BCEs may be promising materials for sensing, actuating, and other advanced applications.

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