A Toughening and Anti‐Counterfeiting Benzotriazole‐Based High‐Performance Polymer Film Driven by Appropriate Intermolecular Coordination Force

Abstract It is of great significance to circumvent the inherent trade‐off between strength and extensibility for epoxy resins. Herein dynamic Cu‐benzotriazole cross‐links are incorporated, as the appropriate intermolecular coordination interaction, into high performance epoxy networks, and the resulting epoxy resins exhibits outstanding thermal stability and mechanical properties, their strength and extensibility are simultaneously improved. Additionally, local manipulation of coordination crosslinking confers the film with anti‐counterfeiting function.