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Bent-Core Liquid Crystal Elastomers
Journal of Materials Chemistry (2010)
  • Rafael Verduzco
  • Paul Luchette
  • Seung Ho Hong
  • John Harden
  • Elaine DiMasi
  • Peter Palffy-Muhoray, Kent State University - Kent Campus
  • S. Michael Kilbey, II
  • Jim T. Gleeson
  • Antal Jákli, Kent State University - Kent Campus

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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Rafael Verduzco, Paul Luchette, Seung Ho Hong, John Harden, et al.. "Bent-Core Liquid Crystal Elastomers" Journal of Materials Chemistry Vol. 20 Iss. 39 (2010)
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