Tunicate-inspired polyallylamine-based hydrogels for wet adhesion: A comparative study of catechol- and gallol-functionalities

Functional adhesives with excellent adhesive strength in wet as well as dry environments are actively studied for various applications. In particular, the adhesion mechanism of marine organisms has been imitated to achieve strong adhesion in wet environments. Polyallylamine (PAA) was modified with catechol groups (CA), which mimic the mussel adhesion proteins, and gallol groups (GA) found in tunicates to compare the gelation, self-healing, and...