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Abstract：
Thermosetting plastics exhibit remarkable mechanical properties and high corrosion resistance, yet the permanent covalent crosslinked network renders these materials challenging for reshaping and recycling. In this study, a high-performance polymer film (EI25-TAD5-Mg) was synthesized by combining click chemistry and cation-π interactions. The internal network of the material was selectively constructed through flexible triazolinedione (TAD) and indole via a click reaction. Cation-π interactions were established between Mg2+ and electron-rich indole units, leading to network contraction and reinforcement. Dynamic non-covalent interactions improved the covalent crosslinked network, and the reversible dissociation of cation-π interactions during loading provided effective energy dissipation. Finally, the epoxy resin exhibited excellent mechanical properties (tensile strength of 91.2 MPa) and latent dynamic behavior. Additionally, the thermal reversibility of the C-N click reaction and dynamic cation-π interaction endowed the material with processability and recyclability. This strategy holds potential value in the field of modifying covalent thermosetting materials.
摘要：
热固性塑料具有卓越的机械性能和高耐腐蚀性，然而，永久性的共价交联网络使这些材料的重塑和回收具有挑战性。在这项研究中,通过结合点击化学和阳离子-π相互作用合成了高性能聚合物膜(EI25-TAD5-Mg)。材料的内部网络通过柔性三唑二酮(TAD)和吲哚经由点击反应选择性地构建。在Mg2+和富电子吲哚单元之间建立了阳离子-π相互作用，导致网络收缩和加固。动态非共价相互作用改善了共价交联网络，加载过程中阳离子-π相互作用的可逆解离提供了有效的能量耗散。最后,环氧树脂表现出优异的力学性能（拉伸强度为91.2MPa）和潜在的动态行为。此外,C-N点击反应和动态阳离子-π相互作用的热可逆性赋予了材料可加工性和可回收性。该策略在修饰共价热固性材料领域具有潜在价值。
