Dynamic Covalent Bonded Gradient Structured Actuators with Mechanical Robustness and Self-Healing Ability
作者：Chuansong Yu, Xinkai Li, Xin Yang, Xiaoyan Qiu, Xinxing Zhang,* Zhenming Chen,* and Yanglin Luo
關鍵字：dynamic covalent bonding, ?exible actuators, gradient structure, MXene, self-healing
論文來源：期刊
發表時間：2024年
Flexible actuators with excellent adaptability and interaction safety have a
wide range of application prospects in many ?elds. However, current ?exible
actuators have problems such as fragility and poor actuating ability. Here,
inspired by the features of nacre structure, a gradient structured ?exible
actuator is proposed with mechanical robustness and self-healing ability. By
introducing dynamic boronic ester bonds at the interface between MXene
nanosheets and epoxy natural rubber matrix, the resulting nanocomposites
with ordered micro-nano structures exhibit excellent tensile strength
(25.03 MPa) and satisfactory repair e?ciency (81.2%). In addition, the
gradient distribution structure of MXene nanosheets endows the actuator
with stable photothermal conversion capability, which can quickly respond to
near-infrared light stimulation. The interlayer dynamic covalent bond
crosslinking enables good response speed after multiple bending and is
capable of functional self-healing after damage. This work introduces gradient
structure and dynamic covalent bonding into ?exible actuators, which
provides a reference for the fabrication of self-healing soft robots, wearable,
and other healable functional materials.