Covalent adaptable networks (CANs) possess multiple functions including reprocessing (or recyclability), self-healing, welding, shape shifting, 3D printing, etc., due to the network rearrangement from dynamic bonds, and favorable performance from their cross-linked feature, and they are supposed to be as sustainable alternatives to thermosets. However, the thermal and mechanical properties, and stability of CANs are often sacrificed for rapid network rearrangement. In this paper, fast-reprocessing CANs with high performance are facilely constructed by in situ polymerization and dynamic cross-linking of styrene (St), maleic anhydride (MA), and acetal diol (BHAD). The rigid and hydrophobic polymer backbone endow the materials with high glass transition temperatures, mechanical performance, and water resistance. Besides, carboxylic group-catalyzed dual dynamic ester and acetal-based networks exhibit faster stress relaxation and realize extrusion reprocessing. This work provides an ingenious and simple strategy of construction of CANs combining rapid network rearrangement and excellent comprehensive performance, which is beneficial for the application of CANs.

中文翻译：

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基于双动态化学的快速再处理和高性能共价自适应网络

共价适应性网络（CANs）具有多种功能，包括再加工（或可回收性）、自愈、焊接、变形、3D 打印等，由于动态键的网络重排，以及它们交联特性的良好性能，它们应该是热固性塑料的可持续替代品。然而，CAN 的热性能和机械性能以及稳定性往往会因快速网络重排而牺牲。在本文中，通过苯乙烯 (St)、马来酸酐 (MA) 和乙缩醛二醇 (BHAD) 的原位聚合和动态交联，轻松构建了具有高性能的快速后处理 CAN。刚性和疏水性聚合物主链赋予材料高玻璃化转变温度、机械性能和耐水性。除了，羧基催化的双动态酯和缩醛基网络表现出更快的应力松弛并实现挤出再加工。这项工作提供了一种巧妙而简单的CAN构建策略，结合了快速的网络重排和优异的综合性能，有利于CAN的应用。