浙江大学谢涛团队报道了一种用于形状和分子结构重构的具有独特拓扑变换的正交动态共价聚合物网络。相关研究成果于2022年1月5日发表在《德国应用化学》。

在典型的动态共价聚合物网络中，键交换可以实现宏观形状的可重构性，但网络结构没有改变。相反的可能性是，网络结构可以设计为切换到与不同材料属性对应的各种拓扑状态。在一个网络中实现两者可以扩大物质范围，但其内在的冲突机制使其具有挑战性。

该文中，研究人员设计了一个动态共价网络，它可以经历两个正交拓扑变换，即支链上的酯交换和主体上的烯烃复分解。能够对宏观形状和分子结构进行独立控制。通过该设计，研究人员展示了一个具有可编程形状和空间可定义机械特性的瓶域网络。该策略为网络聚合物的按需调控铺平了道路。

附：英文原文

Title: An Orthogonal Dynamic Covalent Polymer Network with Distinctive Topology Transformations for Shape- and Molecular Architecture Reconfiguration

Author: Wusha Miao, Bo Yang, Binjie Jin, Chujun Ni, Haijun Feng, Yaoting Xue, Ning Zheng, Qian Zhao, Youqing Shen, Tao Xie

Issue&Volume: 2022-01-05

Abstract: Bond exchange in a typical dynamic covalent polymer network allows access to macroscopic shape reconfigurability, but the network architecture is not altered. An opposite possibility is that the network architecture can be designed to switch to various topological states corresponding to different material properties. Achieving both in one network can expand the material scope, but their intrinsically conflicting mechanisms make it challenging. We design a dynamic covalent network that can undergo two orthogonal topological transformations, namely transesterification on the branched chains and olefin metathesis on the mainframe. This allows independent control of the macroscopic shape and molecular architecture. With this design, we illustrate a bottlebrush network with programmable shape and spatially definable mechanical properties. Our strategy paves a way to on-demand regulation of network polymers.

DOI: 10.1002/anie.202109941

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202109941