Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 24, Issue 9, Pages 1251-1258Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201302568
Keywords
polymer networks; liquid crystals; actuators; finite-element analysis
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Funding
- Netherlands Organization for Scientific Research (NWO, VICI)
- Spanish MINECO [MAT2011-27978-C02-02]
- CSIC project [i-LINK0394]
- Gobierno de Aragon
- FEDER funding (EU)
- NSF-DMR [1106014]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1106014] Funding Source: National Science Foundation
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This work describes the fabrication, characterization, and modelling of liquid crystalline polymer network films with a multiple patterned 3D nematic director profile, a stimuli-responsive material that exhibits complex mechanical actuation under change of temperature or pH. These films have a discrete alternating striped or checkerboard director profile in the plane, and a 90-degree twist through the depth of the film. When actuated via heating, the striped films deform into accordion-like folds, while the film patterned with a checkerboard microstructure buckles out-of-plane. Furthermore, striped films are fabricated so that they also deform into an accordion shaped fold, by a change of pH in an aqueous environment. Three-dimensional finite element simulations and elasticity analysis provide insight into the dependence of shape evolution on director microstructure and the sample's aspect ratio.
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