Document Type

Article

Publication Date

7-23-2018

Abstract

Up to 30 mol% of acrylic acid (AAc) was incorporated into a pH responsive smart adhesive consisting of dopamine methacrylamide (DMA) and 3-acrylamido phenylboronic acid (APBA). FTIR spectroscopy and rheometry confirmed that the incorporation of AAc shifted the pH of catechol-boronate complexation to a more basic pH. Correspondingly, adhesive formulations with elevated AAc contents demonstrated strong adhesion to quartz substrate at a neutral to mildly basic pH (pH 7.5-8.5) based on Johnson-Kendall-Roberts (JKR) contact mechanics test. When pH was further increased to pH 9.0, there was a drastic reduction in the measured work of adhesion (18 and 7 fold reduction compared to values measured at pH 7.5 and 8.5, respectively) due to the formation of catechol-boronate complex. The complex remained reversible and the interfacial binding property of the adhesive was successfully tuned with changing pH in successive contact cycles. However, an acidic pH (pH 3.0) was required to break the catechol-boronate complex to recover the elevated adhesive property. Adding AAc enables the smart adhesive to function in physiological or marine pH ranges.

Publisher's Statement

© 2018 American Chemical Society. Postprint version is available here in compliance with publisher policy. Publisher's version of record: https://dx.doi.org/10.1021/acs.langmuir.8b00373

Publication Title

Langmuir

Version

Postprint

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