Wood-Inspired Dynamic Covalent Cross-Linking Network for Ultrahigh Adhesion Strength, Desired Weather Resistance, and Closed-Loop Recycling Adhesives.

The problems of strength-toughness trade-off and stability-switchability conflict make it a huge challenge to integrate exceptional adhesion and desired recycling performances into a single system. Inspired by wood cellulose molecular chain structure, a parallel-ordered dynamic boronic esters cross-linking network is presented by using 4-dimethylaminopyridine as a countercation stabilizing the boron center to induce boric acid to form ionic spiroborate linkage with linear hydroxyl-decorated epoxy polymer. The ionic spiroborate polymer network has a high cross-linking degree to contribute to structural stability and adhesion strength.