Mussel‐inspired stretchable, anti‐fatigue, self‐healing and biocompatible hydrogel adhesives

Hydrogels can form physically or chemically interactions with tissues and are widely used in the design of bioadhesive material. Polydopamine (PDA)/polyacrylamide (PAM)‐based adhesion hydrogels have emerged as one of the hydrogel adhesive materials with great potential for development. However, this type of hydrogel has low mechanical and adhesion properties, which has certain limitations in practical applications. Herein, inspired by the mussel adhesion mechanism, we introduced PDA into PAM/3‐aminophenylboronic acid grafted sodium alginate (SA‐PBA) double network system prepared a series of adhesive hydrogels, PDA was crosslinked by dynamic boronic ester bonds with SA‐PBA. The experimental results established that the hydrogels have favorable adhesive, anti‐fatigue, stretchable, and self‐healing properties. Cytocompatibility assay and in vitro hemolysis assay also indicated that the multifunctional hydrogel has excellent cytocompatibility and hemocompatibility.