Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 24, Pages 29048-29057Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c04348
Keywords
alkoxyphenacyl; polyurethane adhesive; pressure-sensitive adhesives; underwater adhesion; light-activated debonding
Funding
- NSF [SBIR 1819822]
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By designing alkoxyphenacyl-based polyurethane PSAs, a photoactivated increase and decrease in peel strength has been achieved, overcoming the balance issue between strong initial adhesion and on-demand decrease in adhesion.
Pressure-sensitive adhesives (PSAs) such as sticky notes and labels are a ubiquitous part of modern society. PSAs with a wide range of peel adhesion strength are designed by tailoring the bulk and surface properties of the adhesive. However, designing an adhesive with strong initial adhesion but showing an on-demand decrease in adhesion has been an enduring challenge in the design of PSAs. To address this challenge, we designed alkoxyphenacyl-based polyurethane (APPU) PSAs that show a photoactivated increase and decrease in peel strength. With increasing time of light exposure, the failure mode of our PSAs shifted from cohesive to adhesive failure, providing residue-free removal with up to 83% decrease in peel strength. The APPU-PSAs also adhere to substrates submerged underwater and show a similar photoinduced decrease in adhesion strength.
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