Accordion- like Actuators of Multiple 3D Patterned Liquid Crystal Polymer Films
Accordion- like Actuators of Multiple 3D Patterned Liquid Crystal Polymer Films
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DOI：
10.1002/adfm.201302568
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发表时间：
2014-03-01
影响因子：
19
通讯作者：
Schenning, Albertus P. H. J.
中科院分区：
文献类型：
--
作者：
de Haan, Laurens T.;Gimenez-Pinto, Vianney;Schenning, Albertus P. H. J.
这项工作描述了制造，表征和建模的液晶聚合物网络膜与多个图案化的3D液晶指向矢分布，一种刺激响应材料，表现出复杂的机械致动下的温度或pH值的变化。这些膜具有离散的交替条纹或棋盘式的导演分布在平面上，和90度扭曲通过深度的膜。当通过加热致动时，条纹状膜变形成手风琴状折叠，而具有棋盘状微结构图案的膜则在平面外变形。此外，制造条纹膜，使得它们也通过水性环境中pH的变化而变形为手风琴形折叠。三维有限元模拟和弹性分析提供了深入的形状演变对导演微观结构和样品的纵横比的依赖。
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.