Song Jin Han, Hong Seung-Mo, Park Seok Kyu, Kwon Hyeok Ki, Hwang Seok-Ho, Oh Jong-Min, Koo Sang-Mo, Lee Giwon, Park Chulhwan
Department of Chemical Engineering, Kwangwoon University, 20, Kwangwoon-ro, Nowon-gu, Seoul 01897, Republic of Korea.
R&D Center, SHIN-A T&C, 184 Gasan Digital 2-ro, Geumcheon-gu, Seoul 0851, Republic of Korea.
Polymers (Basel). 2024 Dec 30;17(1):76. doi: 10.3390/polym17010076.
A novel monomer, 9-bis[4-(2-hydroxyethoxy)phenyl]fluorene di(mercaptopropionate), with a highly refractive index, purity, and excellent UV-curable properties, is synthesized through an optimized Fischer esterification process, reacting 9,9-bis[4-(2-hydroxyethoxy)phenyl]fluorene with 3-mercaptopropionic acid. The structural characterization of this monomer is performed using Fourier-transform infrared spectroscopy, nuclear magnetic resonance spectroscopy, high-performance liquid chromatography, and liquid chromatography-mass spectrometry. The synthesis conditions are optimized using a design-of-experiments approach. UV-curable resins are obtained by incorporating the synthesized monomer as the thiol component. The effects of thiol content on the UV-curing behavior, refractive index, shrinkage, adhesion to the polyethylene terephthalate (PET) foil, and viscoelastic recovery are examined. The thermal properties are assessed using differential scanning calorimetry and thermogravimetric analysis. Field-emission scanning electron microscopy confirms the successful replication of the prism film. In edge-lit light-emitting diode (LED) backlight units, the prism film showed increased luminance with higher thiol monomer content in the UV-curable resin while maintaining stable color coordinates. This novel highly refractive index monomer can be utilized in luminance-enhancing prism films, thereby contributing to future innovations in the display film industry.
通过优化的费歇尔酯化反应过程，使9,9 - 双[4 - (2 - 羟基乙氧基)苯基]芴与3 - 巯基丙酸反应，合成了一种具有高折射率、高纯度和优异紫外光固化性能的新型单体9 - 双[4 - (2 - 羟基乙氧基)苯基]芴二(巯基丙酸酯)。使用傅里叶变换红外光谱、核磁共振光谱、高效液相色谱和液相色谱 - 质谱对该单体进行结构表征。采用实验设计方法对合成条件进行优化。通过将合成的单体作为硫醇组分引入，获得了紫外光固化树脂。研究了硫醇含量对紫外光固化行为、折射率、收缩率、对聚对苯二甲酸乙二酯（PET）薄膜的附着力以及粘弹性恢复的影响。使用差示扫描量热法和热重分析评估热性能。场发射扫描电子显微镜证实了棱镜膜的成功复制。在侧光式发光二极管（LED）背光源单元中，棱镜膜在紫外光固化树脂中硫醇单体含量较高时亮度增加，同时保持稳定的色坐标。这种新型高折射率单体可用于提高亮度的棱镜膜，从而为显示薄膜行业的未来创新做出贡献。
