White, E.
, Seppala, J.
, Rushworth, P.
, Sharma, S.
and Locklin, J.
(2013),
Switching the Adhesive State of Catacholic Hydrogels using Phototitration, Macromolecules, [online], https://doi.org/10.1021/ma401594z, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=914238
(Accessed October 12, 2024)
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Switching the Adhesive State of Catacholic Hydrogels using Phototitration
Published
Author(s)
Evan M. White, , Parker M. Rushworth, Suraj Sharma, Jason Locklin
Abstract
A polyacrylamide hydrogel system that can be liquefied by remote activation using UV irradiation was investigated as a degradable adhesive. The linear polyacryamide copolymer, formed by conventional free-radical polymerization, contains biomemetic catechol-iron-mediated cross-linkers that are sensitive to pH changes. Hydrogel films and bulk gels were prepared by basic titration of a polymer solution doped with a photoacid generator, diphenyliodonium chloride, generating an ionic cross- linked network via the catechol pendant groups. Irradiation of these hydrogels with UV light affords a viscous liquid solution, demonstrating a gel-sol transition with a subsequent decrease in the adhesive strength of the material. These gels may be prepared in high throughput and require few synthetic steps with commercially available precursors.Citation
Macromolecules
Volume
46
Issue
22
Pub Type
Journals
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Created November 18, 2013, Updated October 12, 2021