The back light unit (BLU) is a core component of liquid crystal displays (LCDs) that are used in notebook computers, mobile phones, navigation devices, flat screen TVs, and public information display (PID) devices, among many others. To enhance the optical efficiency of LCDs, optical films with a high refractive index have been used in the BLU. In particular, high refractive chemicals have been the subject of recent investigations to enhance the optical efficiency of BLUs. In this study, we efficiently synthesized photocurable, high refractive 2-naphthol epoxy-modified urethane acrylate (2-NEUA) from 2-naphthol via a three-step reaction. The refractive index of 2-NEUA was higher than that of 2-naphthol epoxy acrylate (2-NEA), presumably because it contains more integrated aromatic rings and therefore has a higher electron density than 2-NEA. Furthermore, we critically evaluated the effects of 2-NEUA on the mechanical properties of UV curable films in this article.
The back light unit (BLU) is the core component of LCDs for laptops, mobile phones, navigation, large televisions, and public information displays (PIDs). To enhance the optical efficiency of LCDs, optical films with a high reflective index have been used for BLUs. Highly reflective chemicals have been actively investigated to enhance the optical efficiency and mechanical property of BLUs. In this study, urethane acrylates were modified to improve the anti-abrasion behavior of highly refractive materials. Highly refractive modified urethane acrylate (MUA) was synthesized from o-phenylphenol (OPP), polyols, and diisocyanate. The refractive index of ester-based o-phenylphenol urethane acrylates (OPPUAs) was slightly greater than that of ether-based OPPUAs. The difference was due to the electron density increase induced by molecular interactions in the ester polyol, resulting in a higher refractive index. Additionally, urethane acrylate with carbonate polyol showed the highest viscosity. Based on the anti-abrasion test, the weight loss of MUAs with an alkyl group was less than that in OPPUAs with an aromatic group.
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