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Nanoparticle-Liquid Crystalline Elastomer Composites
Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, UK
Department of Chemistry, Tsinghua University, Beijing 100084, China
* Author to whom correspondence should be addressed.
Received: 30 November 2011; in revised form: 10 January 2012 / Accepted: 14 January 2012 / Published: 30 January 2012
Abstract: Liquid crystalline elastomers (LCEs) exhibit a number of remarkable physical effects, including a uniquely high-stroke reversible mechanical actuation triggered by external stimuli. Fundamentally, all such stimuli affect the degree of liquid crystalline order in the polymer chains cross-linked into an elastic network. Heat and the resulting thermal actuation act by promoting entropic disorder, as does the addition of solvents. Photo-isomerization is another mechanism of actuation, reducing the orientational order by diminishing the fraction of active rod-like mesogenic units, mostly studied for azobenzene derivatives incorporated into the LCE composition. Embedding nanoparticles provides a new, promising strategy to add functionality to LCEs and ultimately enhance their performance as sensors and actuators. The motivation for the combination of nanoparticles with LCEs is to provide better-controlled actuation stimuli, such as electric and magnetic fields, and broad-spectrum light, by selecting and configuring the appropriate nanoparticles in the LCE matrix. Here we give an overview of recent advances in this area with a focus on preparation, physical properties and actuation performance of the resultant nanocomposites.
Keywords: liquid crystal; elastomer; actuation; nanoparticles; nanotubes
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MDPI and ACS Style
Ji, Y.; Marshall, J.E.; Terentjev, E.M. Nanoparticle-Liquid Crystalline Elastomer Composites. Polymers 2012, 4, 316-340.
Ji Y, Marshall JE, Terentjev EM. Nanoparticle-Liquid Crystalline Elastomer Composites. Polymers. 2012; 4(1):316-340.
Ji, Yan; Marshall, Jean E.; Terentjev, Eugene M. 2012. "Nanoparticle-Liquid Crystalline Elastomer Composites." Polymers 4, no. 1: 316-340.