Regulating Actuations and Shapes of Liquid Crystal Elastomers through Combining Dynamic Covalent Bonds with Cooling-Rate-Mediated Control  

作　　者：Ya-Wen Liu Huan Liang Hong-Tu Xu En-Jian He Zhi-Jun Yang Yi-Xuan Wang Yen Wei Zhen Li Yan Ji 

机构地区：[1]The Key Laboratory of Bioorganic Phosphorus Chemistry&Chemical Biology(Ministry of Education),Department of Chemistry,Tsinghua University,Beijing,100084,China [2]Advanced Materials and Energy Center,Academy of Aerospace Science and Innovation,Beijing,100088,China

出　　处：《Chinese Journal of Polymer Science》2024年第10期1442-1448,I0008,共8页高分子科学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.22375114)。

摘　　要：Realizing multiple locked shapes in pre-oriented liquid crystal elastomers(LCEs)is highly desired for diversifying deformations and enhancing multi-functionality.However,conventional LCEs only deform between two shapes for each actuation cycle upon liquid crystal-isotropic phase transitions induced by external stimuli.Here,we propose to regulate the actuation modes and the locked shapes of a pre-orientated epoxy LCE by combining dynamic covalent bonds with cooling-rate-mediated control.The actuation modes can be adjusted on demand by exchange reactions of dynamic covalent bonds.Derived from the established actuation modes,such as elongation,bending,and spiraling,the epoxy LCE displays varied locked shapes at room temperature under different cooling rates.Various mediums are utilized to control the cooling rate,including water,silicone oil,and copper plates.This approach provides a novel way for regulating the actuation modes and locked shapes of cuttingedge intelligent devices.

关 键 词：Liquid crystal elastomer EPOXY Dynamic covalent bond Vitrimer Cooling rate 

分 类 号：TB34[一般工业技术—材料科学与工程]