Abstract: ［Objective］ To address the application requirements of brightness-enhancing filmsfor liquid crystal display backlight modules，targeted research and development of high-refractive-index acrylate was carried out.［Methods］ Using 4，4’-dihydroxydiphenyl sulfone with sulfone-containing and multi-phenyl ring structures as the raw materials，trifunctional acrylate monomer（BPES-TMC）with a refractive index of up to 1. 621 9 was successfully synthesized via a three-stepstepwise modular esterification reaction. Subsequently，a series of brightness-enhancing film（BEF） formulations with BPES-TMC contents ranging from 0 to 20% were designed and fabricated into films through ultraviolet curing. Systematic characterization was performed on the films in terms of curing rate，refractive index，light transmittance，thermal stability and mechanical properties.［Results］The results demonstrated that the brightness-enhancing films maintained refractive index above 1. 58 whenthe BPES-TMC loading was 10%-20%，and exhibited a light transmittance higher than 85% atwavelengths over 460 nm with BPES-TMC addition of 5%-15%. Meanwhile，this series of brightness-enhancing films not only possessed favorable thermal stability but also showed a remarkable improvement in flexibility.［Conclusion］ Trifunctional acrylate monomer BPES-TMC containingsulfone and multi-phenyl structures was synthesized and applied as a high-performance additive inbrightness-enhancing films. At addition levels of 10%-20%，BPES-TMC significantly increased therefractive index of the cured films while maintaining excellent optical transmittance. In addition，the mechanical properties and thermal stability of the films were effectively improved. These results demonstrated that BPES-TMC is a promising candidate for meeting the performance requirements ofBEF in advanced backlight module applications.

Key words: 4, 4’-dihydroxydiphenyl sulfone；trifunctional acrylate；high-refractive-index； brightness-enhancing film

摘要： 【目的】针对液晶显示器背光模组增亮膜的应用需求，开展高折射率丙烯酸酯的定向研发。【方法】以含砜基和多苯环结构的 4, 4’-二羟基二苯砜为原料，通过三步分步模块化酯化反应，成功制备出一种三官能化丙烯酸酯单体（ BPES-TMC，其折射率可达 1.621 9）。随后设计 BPES-TMC质量分数为 0~20%的系列增亮膜配方，经紫外光固化制成增亮膜，并对其固化速率、折射率、透光率、热稳定性及力学性能进行表征。【结果】当 BPES-TMC质量分数为 10%~20%时，增亮膜折射率维持在 1.58以上，当质量分数为 5%~15%时，增亮膜在 460 nm以上的透光率均高于 85%，同时该系列增亮膜兼顾良好的热稳定性，且柔韧性得到显著提升。【结论】含砜基多苯环结构的三官能化丙烯酸酯 BPES-TMC作为一种高性能单体在 10%~20%添加量下可显著提升增亮膜折射率并保持优异透光性，同时改善力学性能与热稳定性，可满足高性能背光模组增亮膜的应用需求。

关键词:  , 4, 4’-二羟基二苯砜；三官能化丙烯酸酯；高折射率；增亮膜

CLC Number: 

• TQ630.4