Accordion-like Actuators of Multiple 3D Patterned Liquid Crystal Polymer Films

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 discr...

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Published in:Advanced functional materials 2014-03, Vol.24 (9), p.1251-1258
Main Authors: de Haan, Laurens T., Gimenez-Pinto, Vianney, Konya, Andrew, Nguyen, Thanh-Son, Verjans, Julien M. N., Sánchez-Somolinos, Carlos, Selinger, Jonathan V., Selinger, Robin L. B., Broer, Dirk J., Schenning, Albertus P. H. J.
Format: Article
Language:English
Subjects:
Actuators
Deformation
finite-element analysis
Liquid crystal polymers
liquid crystals
Mathematical analysis
Microstructure
Networks
polymer networks
Three dimensional
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cited_by cdi_FETCH-LOGICAL-c4268-bddf56e77fbc5ec97c7e99511f2549103dd99a9786f177f55a9a178cc393d24b3
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container_end_page 1258
container_issue 9
container_start_page 1251
container_title Advanced functional materials
container_volume 24
creator de Haan, Laurens T.
Gimenez-Pinto, Vianney
Konya, Andrew
Nguyen, Thanh-Son
Verjans, Julien M. N.
Sánchez-Somolinos, Carlos
Selinger, Jonathan V.
Selinger, Robin L. B.
Broer, Dirk J.
Schenning, Albertus P. H. J.
description 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. Accordion‐like deformation is achieved in polymer films consisting of crosslinked liquid crystal polymer networks having a multiple 3D pattern. The exotic deformation behavior can be induced in both heat and pH sensitive materials. A finite element analysis is used to explain the observations and to predict the strength and amplitude of the actuators.
doi_str_mv 10.1002/adfm.201302568
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subjects Actuators
Deformation
finite-element analysis
Liquid crystal polymers
liquid crystals
Mathematical analysis
Microstructure
Networks
polymer networks
Three dimensional
title Accordion-like Actuators of Multiple 3D Patterned Liquid Crystal Polymer Films
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