Cooperative Chemical Coupling and Physical Lubrication Effects Construct Highly Dynamic Ionic Covalent Adaptable Network for High- Performance Wearable Electronics
Cooperative Chemical Coupling and Physical Lubrication Effects Construct Highly Dynamic Ionic Covalent Adaptable Network for High- Performance Wearable Electronics
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协同化学耦合和物理润滑效应构建高性能可穿戴电子产品的高动态离子共价适应性网络
DOI：
10.31635/ccschem.022.202202037
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发表时间：
2023-05-01
期刊：
影响因子：
11.2
通讯作者：
Zhu, Meifang
中科院分区：
文献类型：
--
作者：
Sun, Lijie;Huang, Hongfei;Zhu, Meifang
共价自适应网络（can）结合了传统热固性材料和热塑性塑料的优点，引起了人们的广泛关注。在can中，可逆共价键的动力学和聚合物链的迁移率决定了聚合物网络的拓扑重排，这对其自愈和再加工等优越特性至关重要。在此，我们将离子液体引入到二甲氧基氨基甲酸乙酯（DOU）基can中，通过化学偶联和物理润滑来调节可逆键动力学和聚合物链的迁移。小分子模型实验证明，离子液体可以催化动态DOU键交换。离子液体还能破坏聚合物链之间的氢键，从而增加它们的流动性。结果表明，动态网络的解离活化能从110 kJ mol-1降低到85 kJ mol-1。此外，离子液体作为功能基团赋予了can新的性能，将极大地拓展其应用领域。例如，由此产生的离子CAN （iCAN）的导电性已经证明了构建高性能多功能可穿戴电子设备的强大能力，可响应多种刺激，包括温度、应变和湿度。这项研究提供了一种新的设计原则，同时利用两种结构组件的化学和物理效应来调节材料性能，从而实现新的应用。
Covalent adaptable networks (CANs), which com-bine the benefits of traditional thermosets and ther-moplastics, have attracted considerable attention. The dynamics of reversible covalent bonds and mobility of polymer chains in CANs determine the topological rearrangement of the polymeric net-work, which is critical to their superior features, such as self-healing and reprocessing. Herein, we introduce an ionic liquid to dimethylglyoxime-urethane (DOU)-based CANs to regulate both reversible bond dynamics and polymer chain mo-bility by cooperative chemical coupling and physi-cal lubrication. Small-molecule model experiments demonstrated that ionic liquids can catalyze dy-namic DOU bond exchange. Ionic liquid also breaks the hydrogen bonds between polymeric chains, thereby increasing their mobility. As a combined result, the activation energy of the dissociation of the dynamic network decreased from 110 to 85 kJ mol-1. Furthermore, as a functional moiety, the ionic liquid imparts new properties to CANs and will greatly expand their applications. For example, the consequent conductivity of resultant ionic CAN (iCAN) has demonstrated a great power to build high-performance multifunctional wearable elec-tronics responsive to multiple stimulations includ-ing temperature, strain, and humidity. This study provides a new design principle that simultaneously uses the chemical and physical effects of two struc-tural components to regulate material properties enabling novel applications.