Bioinspired phenol-amine chemistry for developing bioadhesives based on biomineralized cellulose nanocrystals. (15th November 2022) - Li, Kuang
Abstract: Inspired by the phenol-amine chemistry and biomineralization of insect cuticles, we developed a green and facile strategy for preparing a bio-adhesive with excellent adhesion properties, mildew resistance, and antibacterial activity. This biomimetic strategy incorporates functional catechol-modified ε -polylysine and vanillin via grafting and Schiff base reactions. The biomineralized cellulose nanocrystals were prepared using a cellulose nanocrystal bio-template by regulating the in-situ biomineralization of inorganic nanoparticles, thereby building an optimized organic–inorganic mineralization framework in the polymer. The bonding strength of composite adhesive was significantly improved by multiple cross-linking networks through sacrificial hydrogen bonds, electrostatic interactions, and dynamic covalent bonds. The adhesion strength of the composite adhesive reached 1.13 MPa, which was 151% higher than the pristine adhesive. As a result of the synergistic effect of the catechol component, cationic ε -polylysine, and aldehyde group, the bio-adhesive also exhibited favorable anti-mildew and anti-bacterial properties. Graphical abstract: Unlabelled Image Highlights: Bio-adhesive is developed using phenol-amine chemistry and biomineralization. 3, 4-Dihydroxyphenylacetic acid with phenolic groups acts as a crosslinking agent. Organic–inorganic framework is built by biomineralized cellulose nanocrystals. The adhesion strength of the composite adhesive is significantly improved by 151%. Vanillin and ε -polylysine endow bioadhesives with good antibacterial properties.