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. 2021 Mar 2;29(2):129–139. doi: 10.1007/s13233-021-9018-3

Influence of UV Polymerization Curing Conditions on Performance of Acrylic Pressure Sensitive Adhesives

Eun Seon Kim 1,2, Jae Heung Lee 1, Dong Hack Suh 2, Woo Jin Choi 1,✉
PMCID: PMC7921609  PMID: 33679274

Abstract

Acrylic pressure sensitive adhesives (PSAs) were prepared by UV polymerization under varying curing conditions of both fast and slow curing, employing high- and low-intensity UV radiation, respectively. The influences of curing conditions and isobornyl acrylate (IBOA) content on PSA performance were comprehensively investigated by measurement of their rheological, thermal, and adhesive properties. In particular, rheological characterization was accomplished by several analytical methods, such as in situ UV rheology, frequency sweep, stress relaxation, and temperature ramp tests, to understand the effect of the UV curing process and IBOA content on the viscoelastic behavior of acrylic PSAs. The slow-cured samples were observed to form more tightly crosslinked networks compared to the fast-cured. On the other hand, at high loading levels of IBOA, in the case of slow curing, the sample exhibited a contrasting trend, having the shortest stress relaxation time and the highest energy dissipation; this was due to molecular chain scission occurring in the crosslinked polymer during UV polymerization. Consequently, we successfully demonstrated the influence of monomer composition of acrylic PSAs, and that of curing conditions employed in UV polymerization. This study provides valuable insights for the development of crosslinked polymer networks of acrylic PSAs for flexible display applications.

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Keywords: pressure sensitive adhesives (PSAs), UV polymerization, viscoelasticity, rheological properties, flexible displays

Footnotes

Acknowledgments: This work was supported by the Industrial Core Technology Development Program (10053627, Development of adhesive materials for foldable display with curvature lower than 2 mm and durability more than 100 thousand times) funded by the Ministry of Trade, Industry and Energy (MOTIE), Republic of Korea, and the Core Research Project at Korea Research Institute of Chemical Technology (KRICT) (KK1953-20) funded by the Ministry of Science and ICT (MSIT), Republic of Korea.

Publisher’s Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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