A toughening indole‐based epoxy film with efficient anti‐counterfeiting properties driven by cation–π interaction

Abstract A strong and tough indole‐based epoxy film driven by cation– π interaction is designed, evading the trade‐off between stiffness and extensibility in epoxy resins. The film with high strength, toughness and effective anti‐counterfeiting properties induced by cation– π interaction is promising in the development of the fields of aerospace and electronic devices. © 2023 Society of Industrial Chemistry.