Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu, 610041, China.
University of Chinese Academy of Sciences, Beijing, 100049, China.
Macromol Rapid Commun. 2019 Jun;40(11):e1900001. doi: 10.1002/marc.201900001. Epub 2019 Mar 20.
Multiple shape memory thermosets for various engineering applications have been quickly developed in recent years, mainly due to their stable thermomechanical performance, environmental stability, excellent chemical, solvent resistance, etc. However, these thermosets are inherently non-recyclable due to their chemically crosslinked properties, and it is difficult to make the permanent shapes of these thermosets sophisticated and geometrically complex, which significantly restricts a great variety of engineering applications in the industry and technology fields, mainly due to the economic inefficiency and environmental impact. Here, a thermoset with recyclability, multiple shape memory effect (multi-SME), and permanent shape reconfiguration is reported. After recycling, it also exhibits excellent mechanical properties without sacrificing the excellent multi-SME, combined elasticity (shape memory), and solid state plasticity, which can be easily scaled up and generalized to a variety of dynamic covalent networks.
近年来，多种形状记忆热固性材料已经迅速应用于各种工程领域，这主要得益于其稳定的热机械性能、环境稳定性、优异的耐化学性、耐溶剂性等。然而，由于这些热固性材料的化学交联特性，它们本质上是不可回收的，并且很难使这些热固性材料的永久形状变得复杂和具有复杂的几何形状，这极大地限制了它们在工业和技术领域的各种应用，主要是因为其经济效率低下和环境影响。在这里，我们报道了一种具有可回收性、多重形状记忆效应（multi-SME）和永久形状重构的热固性材料。在回收后，它仍然具有出色的机械性能，同时保持了出色的 multi-SME、结合弹性（形状记忆）和固态塑性，这使其易于放大和推广到各种动态共价网络。
