Abstract
Inspired by mussels and sandcastle worms, a water‐soluble adhesive is prepared by grafting catechol and phosphoric acid functionalities to the polyoxetane backbone, which achieves improved adhesion in humid environment. The adhesive is characterized by 1H and 31P NMR spectroscopy and size‐exclusive chromatography. The influence of the content ratio of catechol and different phosphoric acid groups and the Fe3+ ions as the crosslinker on the outcome of the adhesive properties is investigated. When the molar ratio of Fe3+ to catechol and PO4 is 1/1 and 0.7/1, respectively, the best bonding strength of 0.35 MPa is achieved for the adhesive containing 5 mol% catechol and 26 mol% bis‐phosphoric acid groups under humid conditions. It is found out that Fe3+ interacts not only with the catechol, but also with the bis‐phosphoric acid groups, which accounts for its performance in humid conditions. image
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