Abstract
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.
Highlights
Pressure-sensitive adhesives (PSAs) are semisolid phase materials used to bond the surfaces of various materials primarily by adhesion and cohesion
To confirm the potential use of PSA in flexible displays, acrylic elastomer (AE) was applied to an acrylic PSA in order to assess adhesion performance and recovery
PSA/AE blend was approximately 100%, which demonstrates that the two components are mutually miscible, leading to a film completely devoid of any haze
Summary
Pressure-sensitive adhesives (PSAs) are semisolid phase materials used to bond the surfaces of various materials primarily by adhesion and cohesion. PSA needs to exhibit various physical properties depending on the characteristics of the product to which it is applied; these products range from a variety of industries, including the medical, electronics, construction, and automobile industries [1]. Acrylic PSAs have many advantages, such as excellent aging characteristics, high temperature resistance, and excellent optical transparency [2]. Acrylic PSAs have the advantage that their properties can be controlled by molecular weight, structure, and functional groups [3]. Interest in developing flexible displays has rapidly increased, and improving the functionality of acrylic PSAs is an emerging necessity.
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