Bio-Mimetic Actuators of a Photothermal-Responsive Vitrimer Liquid Crystal Elastomer with Robust, Self-Healing, Shape Memory, and Reconfigurable Properties.

Abstract

Soft actuators with apparent uniqueness in exhibiting complex shape morphing are highly desirable for artificial intelligence applications. However, for the majority of soft actuators, in general, it is challenging to achieve versatility, durability, and configurability simultaneously. Enormous works are devoted to meet the multifunctional smart actuators, to little effect. Herein, self-healing and bio-mimetic smart actuators are proposed based on azobenzene chromophores and dynamic disulfide bonds. Benefiting from the dynamic and drivable vitrimer liquid crystal elastomer (V-LCE) materials, a series of actuators with single or compound dynamic three-dimensional structures were fabricated, which were capable of double-stimuli response and complex "bionic" motions, such as the blooming of a flower, grasping and loosening an object, and so forth. Moreover, these flexible actuators showed fascinating properties, such as high robustness, excellent elasticity-plasticity shape-memory properties (Rf and Rr are close to 100%), easily reconfigurable property, and self-healing. This smart V-LCE provides a guideline to design and fabricate soft versatility actuators, which has prospects for developing smart bionic and artificial intelligence devices.