Development of a light-deactivatable PSA via photodimerization

Scott R. Trenor, Timothy Edward Long, Brian J. Love

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Photoreactive pressure-sensitive (PSAs) were developed to create photo-adhesives deactivatable resins. Coumarin-functionalized poly(2-ethylhexyl acrylate-cohydroxyethyl acrylate) was prepared via traditional free-radical polymerization followed by quantitative hydroxyl group esterification and studied as model photoactive PSAs. The polymers were solution-cast into films and photocrosslinked via dimerization of the coumarin derivatives with ultraviolet-A (UVA) light irradiation ( > 300 nm). Ultraviolet-Visible (UV-Vis) spectroscopy indicated that approximately 60% of the coumarin groups photodimerized when exposed to 22 J cm-2 of UVA irradiation. The formation of reversible coumarin crosslinks gelled the model PSA and reduced peel strength from 1.62 to O. 05N/mm. UVC irradiation photocleaved the coumarin dimers, reducing the crosslink density and raising the peel strength to O. 10N/mm. This reversibility of the coumarin photodimerization and consequent peel-strength modulation may provide a mechanism for the repeated use of these model adhesives.

Original languageEnglish
Pages (from-to)213-229
Number of pages17
JournalJournal of Adhesion
Volume81
Issue number2
DOIs
Publication statusPublished - 2005 Feb 1
Externally publishedYes

Fingerprint

Irradiation
acrylates
adhesives
irradiation
Adhesives
Dimerization
Ultraviolet visible spectroscopy
Esterification
Polymer solutions
Free radical polymerization
dimerization
Dimers
free radicals
resins
casts
polymerization
Coumarins
Resins
dimers
Modulation

Keywords

  • Coumarin
  • Photodimerization
  • PSA
  • UV crosslinking

ASJC Scopus subject areas

  • Chemistry(all)
  • Mechanics of Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Development of a light-deactivatable PSA via photodimerization. / Trenor, Scott R.; Long, Timothy Edward; Love, Brian J.

In: Journal of Adhesion, Vol. 81, No. 2, 01.02.2005, p. 213-229.

Research output: Contribution to journalArticle

Trenor, Scott R. ; Long, Timothy Edward ; Love, Brian J. / Development of a light-deactivatable PSA via photodimerization. In: Journal of Adhesion. 2005 ; Vol. 81, No. 2. pp. 213-229.
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