Repeatedly Programmable Liquid Crystal Dielectric Elastomer with Multimodal Actuation

材料科学 电介质 弹性体 液晶 介电弹性体 纳米技术 高分子科学 光电子学 复合材料
作者
Chengcheng Zhang,Guancong Chen,Kaihang Zhang,Binjie Jin,Qian Zhao,Tao Xie
出处
期刊:Advanced Materials [Wiley]
卷期号:36 (16) 被引量:22
标识
DOI:10.1002/adma.202313078
摘要

Abstract Dielectric elastomers (DEs) are actuatable under an electric field, whose large strain and fast response speed compare favorably with natural muscles. However, the actuation of DE‐based devices is generally limited to a single mode and cannot be reconfigured after fabrication, which pales in comparison to biological counterparts given the ability to alter actuation modes according to external conditions. To address this, liquid crystal dielectric elastomers (LC‐DEs) that can alter the dielectric actuation modes based on the thermally triggered shape‐changing are prepared. Specifically, the two shapes through the LC phase transition possess different bending stiffness, which leads to distinct actuation modes after an electric field is applied. Moreover, the two shapes can be individually programmed/reprogrammed, that is, the one before the transition is regulated through force‐directed solvent evaporation and the one after the transition is via bond exchange‐enabled stress relaxation. As such, the multimodal dielectric actuation behaviors upon temperature change can be readily diversified. Meanwhile, the space charge mechanism endows LC‐DEs with the significantly reduced driving e‐field (8 V µm −1 ) and bidirectional actuation manners. It is believed this unique adaptivity in the actuation modes under a low electric field shall offer versatile designs for practical soft robots.
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