writer：Jie Cao#; Changlin Zhou#; Gehong Su; Xinxing Zhang*; Tao Zhou*；; Zehang Zhou; Yibo Yang;
keywords：3D geometric structures, actuators, ambient temperature processing, covalent–noncovalent interpenetrating networks, self-healing
source：期刊
specific source：Advanced Materials
Issue time：2019年

Soft materials that can reversibly transform shape in response to moisture have applications in diverse areas such as soft robotics and biomedicine. However, the design of a structurally transformable or mechanically self-healing version of such a humidity-responsive material, which can arbitrarily change shape and reconfigure its 3D structures remains challenging. Here, by drawing inspiration from a covalent–noncovalent network, an elaborately designed biopolyester is developed that features a simple hygroscopic actuation mechanism, straightforward manufacturability at low ambient temperature (≤35 °C), fast and stable response, robust mechanical properties, and excellent self-healing ability. Diverse functions derived from various

3D shapes that can grasp, swing, close–open, lift, or transport an object are further demonstrated. This strategy of easy-to-process 3D structured self-healing actuators is expected to combine with other actuation mechanisms to extend new possibilities in diverse practical applications.