Printable Tough Adhesive for Instant Fatigue‐Resistant Bonding of Diverse Surfaces

Adhesives can stably hold adherent components together. However, a simple design of a high‐performance printable tough adhesive (PTA) with instant fatigue‐resistant adhesion on various substrates is still a significant challenge. Here, the authors report a rapid design to meet this requirement that enables one‐step adhesion of PTA on wet and dry, porous, and nonporous surfaces low as 5 s. This design gives an interfacial toughness of ≈3000 J m−2 and comparable mechanical and fatigue‐resistant properties. The adhesive precursor can be used as an adhesive paint for bonding materials even underwater and maintains strong adhesion under several thousand cycles of large deformation or in a wide temperature range. Moreover, the PTA precursor is chemically stable and controllable, thus benefiting the printing of heterogeneous, 4D shape‐memory composites and a wearable electroluminescent sensor. It is anticipated that this rapid one‐step design of PTA opens new horizons to tough adhesion of diverse surfaces. A rapid one‐step strategy for printable tough adhesives is for the first time reported achieving strong, tough adhesion on various wet and dry, porous and nonporous surfaces in seconds, which is widely compatible with casting, painting, and typical patterning/printing techniques, therefore showing great application potential in printing complicated hydrogel composites, 4D shape‐memory structures, and wearable electronic devices.