Multifunctional all-biomass-derived hydroplastic thermoset polyimine for 3D multiple information encryption and self-adhesive strain sensors

The development of sustainable and eco-processing thermosets with excellent mechanical properties and advanced functionality is important but faces great challenges. Here, we prepare all -biomass-derived thermoset polyimines containing dynamic networks of non-covalent aggregates (driven by H bonds and 1t -1t stacking) and imine bonds. Smart molecular design leads to multifunctionality, such as tunable mechanical properties, hydroplasticity, polychromatic pho-toluminescence, and composite reprocessing. Effectively combining these functions provides convenient ways for designing materials with advanced applications. We demonstrate the feasibility of building a 3D anti-counterfeiting platform, allowing polymorphic data encryp-tion and multidimensional decryption, as well as sensitive stretchable dry and self-adhesive strain sensors with appropriate conformal contact with the skin. The nitrogen-rich synergistic high-char-forming benzene rings give it an intumescent flame-retardant performance that meets the criteria for fire safety. The results provide insights into sus-tainable bio-based plastics with integrated functions and advanced applications.