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Photoresponsive Polymers for Debonding-on-Demand Pressure-Sensitive Adhesives.

Ibrahim O Raji1, Nishad Dhopatkar2, Thomas G Ribelli2

  • 1Department of Chemistry and Biochemistry, Miami University, 651 E High St., Oxford, Ohio 45056, United States.

ACS Applied Materials & Interfaces
|March 26, 2026
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Summary
This summary is machine-generated.

This study introduces a novel photoresponsive adhesive that strengthens with UV light but can be easily removed on demand. This debond-on-demand pressure-sensitive adhesive (PSA) technology offers a promising solution for advanced material applications.

Keywords:
coumarin dimerizationdebondingdynamic bondingphotochemistrypressure-sensitive adhesiveresponsive networks

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Surface Chemistry

Background:

  • Designing pressure-sensitive adhesives (PSAs) with both strong adhesion and easy removal on demand presents a significant challenge.
  • Traditional adhesives often compromise one property for the other, limiting their application scope.

Purpose of the Study:

  • To develop a photoresponsive PSA capable of controlled adhesion and debonding.
  • To investigate the use of coumarin-based photo-crosslinking for achieving debond-on-demand (DoD) properties.

Main Methods:

  • Synthesized a coumarin-containing PSA utilizing either permanent static covalent bonds or dynamic metal-ligand coordination bonds.
  • Employed UV light to induce photo-crosslinking via cycloaddition, increasing network cross-link density.
  • Utilized thermal, rheological, and lap shear experiments to evaluate adhesive properties and debonding behavior.

Main Results:

  • Photoinduced cycloaddition successfully increased cross-link density upon UV exposure.
  • Increased cross-linking led to enhanced stiffness, significantly reducing adhesion and enabling debonding.
  • PSAs with metal-ligand dynamic bonds and persistent cross-linkers showed improved adhesive strength while retaining debonding capability.

Conclusions:

  • The developed photoresponsive PSA demonstrates effective debond-on-demand (DoD) adhesion.
  • This coumarin-based system offers a practical approach to tunable adhesion for advanced applications.
  • The study highlights the potential of photoresponsive polymers in creating smart adhesives.