Dynamic Interfacial Adhesion through Cucurbit[n]uril Molecular Recognition

• Published in: Angewandte Chemie - International Edition
• Main Author: Liu J.; Tan C.S.Y.; Scherman O.A.
• Format: Article
• Language: English
• Published: Wiley-VCH Verlag 2018
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85049800787&doi=10.1002%2fanie.201800775&partnerID=40&md5=ea10992493c53f806646e8b426839a36

Supramolecular building blocks, such as cucurbit[n]uril (CB[n])-based host–guest complexes, have been extensively studied at the nano- and microscale as adhesion promoters. Herein, we exploit a new class of CB[n]-threaded highly branched polyrotaxanes (HBP-CB[n]) as aqueous adhesives to macroscopically bond two wet surfaces, including biological tissue, through the formation of CB[8] heteroternary complexes. The dynamic nature of these complexes gives rise to adhesion with remarkable toughness, displaying recovery and reversible adhesion upon mechanical failure at the interface. Incorporation of functional guests, such as azobenzene moieties, allows for stimuli-activated on-demand adhesion/de-adhesion. Macroscopic interfacial adhesion through dynamic host–guest molecular recognition represents an innovative strategy for designing the next generation of functional interfaces, biomedical devices, tissue adhesives, and wound dressings. © 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim