Changes in UV-curing Properties of Polyurethane Acrylate-based Silver Nanoelectrode Transfer Adhesives as a Function of Photoinitiator and Diluent Content

Abstract

We prepared adhesives for silver nanoelectrode transfer with high transmittance and adhesion using a UV -cur-able polyurethane acrylate. The silane-capped polyurethane acrylate (PUAS) contained polycaprolactone diol, isophorone diisocyanate, 2-hydroxyethyl methacrylate, and 3-aminopropyl triethoxysilane. The PUAS-based adhesives were obtained using the PUAS oligomer, acrylic diluents (2-hydroxyethyl acrylate and 1,6-hexanediol diacrylate), and 1-hydroxycy-clohexyl phenyl ketone as photoinitiator. The adhesion properties of the PUAS-based adhesives between polycarbonate (PC)/PC films and their UV curing properties were compared by controlling the content of photoinitiator and diluents. Transmittance and yellowness were well confirmed for all adhesive types, and their heat resistance increased with increas-ing diluent content. In addition, as the diluent content increased, the adhesion strength of the PC/PC film increased, and the silver nanoelectrodes were efficiently transferred to the PC film, showing excellent sheet resistance properties.