Class-II-type nanosilica-epoxy hybrid coating with high moisture barrier performance and mechanical robustness

• Published in: Progress in organic coatings Vol. 126; pp. 136 - 141
• Main Authors: Im, Hyeon-Gyun, Park, Hoy Yul, Kang, Dong Jun
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01.01.2019; Elsevier BV
• Subjects: Barriers; Chemical synthesis; Crosslinking; Hybrid coating; Mechanical properties; Moisture; Moisture barrier; Nanosilica; OLED; Optical properties; Organic light emitting diodes; Physical properties; Sol-gel processes; Surface modification; Surface modification; OLED; Moisture barrier; Nanosilica; Hybrid coating
• ISSN: 0300-9440; 1873-331X
• DOI: 10.1016/j.porgcoat.2018.10.010

•We introduce class-II-type high-performance hybrid coating (NS-EP hybrid) composed of a surface-modified nanosilica and a thermo-curable epoxy matrix.•The NS-EP hybrid exhibits excellet moisture barrier performace as well as robust mechanical property.•The OLED device is encapsulaed with the NS-EP hybrid coating, and thus shows considerably extended lifetime. We report the development of a class-II-type hybrid coating (NS-EP hybrid) composed of surface-modified nanosilica (NS) as the filler and a thermo-curable epoxy polymer (EP) as the matrix. NS is synthesized using a hydrolytic sol-gel process; its hydroxyl surface is rendered cross-linkable using glycidyl ligands to ensure homogeneous dispersion and optimal hybridization with the EP matrix. The NS-EP hybrid shows high optical transparency, enhanced mechanical properties, and improved moisture barrier performance. Further, we discuss the physical properties of the hybrid with respect to the NS content. To study the applicability of the hybrid as a high-performance barrier material in practical applications, an actual OLED device is encapsulated using the hybrid.