Zou Weike, Jin Binjie, Wu Yi, Song Huijie, Luo Yingwu, Huang Feihe, Qian Jin, Zhao Qian, Xie Tao
State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China.
Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province, Department of Engineering Mechanics, Zhejiang University, Hangzhou 310027, China.
Sci Adv. 2020 Mar 27;6(13):eaaz2362. doi: 10.1126/sciadv.aaz2362. eCollection 2020 Mar.
Dynamic covalent polymer networks exhibit unusual adaptability while maintaining the robustness of conventional covalent networks. Typically, their network topology is statistically nonchangeable, and their material properties are therefore nonprogrammable. By introducing topological heterogeneity, we demonstrate a concept of topology isomerizable network (TIN) that can be programmed into many topological states. Using a photo-latent catalyst that controls the isomerization reaction, spatiotemporal manipulation of the topology is realized. The overall result is that the network polymer can be programmed into numerous polymers with distinctive and spatially definable (thermo-) mechanical properties. Among many opportunities for practical applications, the unique attributes of TIN can be explored for use as shape-shifting structures, adaptive robotic arms, and fracture-resistant stretchable devices, showing a high degree of design versatility. The TIN concept enriches the design of polymers, with potential expansion into other materials with variations in dynamic covalent chemistries, isomerizable topologies, and programmable macroscopic properties.
动态共价聚合物网络展现出非凡的适应性，同时保持了传统共价网络的稳健性。通常，它们的网络拓扑结构在统计学上是不可改变的，因此其材料性能也不可编程。通过引入拓扑异构性，我们展示了一种拓扑可异构化网络（TIN）的概念，该网络可以被编程为多种拓扑状态。使用控制异构化反应的光潜催化剂，实现了拓扑结构的时空操纵。总体结果是，网络聚合物可以被编程为具有独特且空间可定义的（热）机械性能的多种聚合物。在众多实际应用机会中，TIN 的独特属性可用于探索作为形状变换结构、自适应机器人手臂和抗断裂可拉伸装置，展现出高度的设计通用性。TIN 概念丰富了聚合物的设计，并有可能扩展到其他具有动态共价化学、可异构化拓扑结构和可编程宏观性能变化的材料。
