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Adhesion Performance and Recovery of Acrylic PSA with Acrylic Elastomer (AE) Blends via Thermal Crosslinking for Application in Flexible Displays

1
Lab. of Adhesion and Bio-Composites; Program in Environmental Materials Science; Seoul National University, Seoul 08826, Korea
2
Research Institute of Agriculture and Life Sciences; College of Agriculture and Life Sciences; Seoul National University, Seoul 08826, Korea
3
Samsung Display Co., Ltd., Yongin 08826, Korea
*
Author to whom correspondence should be addressed.
Polymers 2019, 11(12), 1959; https://doi.org/10.3390/polym11121959
Received: 23 October 2019 / Revised: 21 November 2019 / Accepted: 22 November 2019 / Published: 28 November 2019
Acrylic pressure-sensitive adhesive (PSA) is used to fix each layer of a flexible display. Acrylic PSA needs to satisfy specific elongation and recovery requirements so that reliability of the flexible display can be achieved. For this reason, we aimed to design an acrylic PSA/acrylic elastomer (AE) blend and to study how some viscoelastic and adhesion properties are influenced by the AE content into the mixed, blended system. Samples were characterized by UV–Vis spectrophotometry for transmittance, texture analysis for adhesion performances, and dynamic mechanical analysis (DMA) for recovery and viscoelasticity. When acrylic PSA/AE was simply blended, the adhesion performance changed due to the influence of the long molecular chains of AE. Based on this result, the AE content was fixed at 10 wt %, and acrylic PSA prepolymer was crosslinked at different concentrations of crosslinking agent. Peel strength and probe tack decreased as the concentration of crosslinking agent increased, as reported in previous studies. On the other hand, as the content of the crosslinking agent increased, recovery characteristics were improved. Additionally, as the content of the crosslinking agent increased, the storage modulus also increased, although the glass-transition temperature was not affected. According to these findings, we successfully proved the possibility of using AE to adjust adhesion performance and recovery of acrylic PSA for designing flexible displays.
Keywords: acrylic pressure-sensitive adhesives; acrylic elastomer; thermal crosslinking; adhesion performance; recovery acrylic pressure-sensitive adhesives; acrylic elastomer; thermal crosslinking; adhesion performance; recovery
MDPI and ACS Style

Lee, J.-H.; Shim, G.-S.; Kim, H.-J.; Kim, Y. Adhesion Performance and Recovery of Acrylic PSA with Acrylic Elastomer (AE) Blends via Thermal Crosslinking for Application in Flexible Displays. Polymers 2019, 11, 1959.

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