Flexibility properties of pressure-sensitive adhesive with different pattern of crosslinking density for electronic displays

Abstract

Displays in electronic devices visualize digital information, which is essential for humans to ultimately understand and use the Internet of Things (IoT) technology. Along with the evolution of several electrical components for flexible displays, developing flexible pressure-sensitive adhesives (PSA) is also important. In this study, a pattern of crosslinking density was applied to a PSA during the ultraviolet (UV) curing process to secure adhesion, transparency, stress relaxation, and supplement the strain recovery performance. We measured the modulus of each pattern region by atomic force microscopy (AFM) and confirmed whether the UV pattern PSA was prepared through the implementation of differential crosslinking density. Additionally, we measured dynamic mechanical analysis (DMA) strain recovery test, rheometer, peel strength, probe tack, and transmittance to confirm the effect of the given crosslinking density pattern on the overall physical properties of PSA.