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Issue 19, 2019
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Boron nitride nanosheet embedded bio-inspired wet adhesives with switchable adhesion and oxidation resistance

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Abstract

Smart adhesives that can debond from a surface on-command in response to stimuli are highly desired. However, the over-oxidation of mussel-mimetic adhesives greatly reduces free-catechol groups and results in an irreversible cross-linked network, especially in alkaline environments. Driven by the synergistic effects of reconstructive Schiff base equilibrium and adjustable dimethylaminoethyl methacrylate (DMAEMA) wettability, an insulated and bactericidal mussel-mimetic nanocomposite adhesive is developed with switchable adhesion and oxidation resistance. Amino-decorated boron nitride nanosheets serve as adhesive building blocks, which can interact with aldehyde group-terminated PEG side chains to form pH-responsive Schiff base networks in situ, reinforcing the cohesion of the adhesive. The alkaline-induced hydrophobic DMAEMA, displaying oxidation inhibiting effects, is subtly incorporated; it can maintain sufficient free-catechol groups to provide desirable adhesion and hinder the irreversible crosslinking of catechols. After acid treatment, the debonding of imine linkages together with acid-induced hydrophilic DMAEMA can drastically decrease bonding strength. Besides, the unique electric properties of BNNSs and the inherent antibacterial activity of Schiff bases endow the as-prepared adhesive with additional prominent functionality, such as high breakdown strength, a low dielectric constant, low dielectric loss and superior bactericidal effects against both Gram-positive and Gram-negative bacteria. This multifunctional adhesive may possess extensive applications in the biomedical and marine industries.

Graphical abstract: Boron nitride nanosheet embedded bio-inspired wet adhesives with switchable adhesion and oxidation resistance

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Supplementary files

Article information


Submitted
15 Mar 2019
Accepted
05 Apr 2019
First published
15 Apr 2019

J. Mater. Chem. A, 2019,7, 12266-12275
Article type
Paper

Boron nitride nanosheet embedded bio-inspired wet adhesives with switchable adhesion and oxidation resistance

B. Jin, G. Zhang, J. Lian, Q. Zhang, X. Zhan and F. Chen, J. Mater. Chem. A, 2019, 7, 12266
DOI: 10.1039/C9TA02827G

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