UV引发硫醇-烯反应制备OLED屏封装用八乙烯基倍半硅氧烷/聚氨酯丙烯酸酯液态光学胶  

Octavinylsesimiloxane Polyhedral Oligomer Silsesquioxane/Polyurethane Acrylate Liquid Optically Clear Adhesive for OLED Screen Packaging by UV-Initiated Thiol-Ene Reaction

作　　者：庞尔宝 王泓中 朱渊杰 王均安[2] 贺英[1] Erbao Pang;Hongzhong Wang;Yuanjie Zhu;Jun’an Wang;Ying He(Department of Polymer Materials,School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China;Institute of Materials,School of Materials Science and Engineering,Shanghai University,Shanghai 200072,China)

机构地区：[1]上海大学材料科学与工程学院高分子材料系,上海200444 [2]上海大学材料科学与工程学院材料研究所,上海200072

出　　处：《高分子材料科学与工程》2023年第2期126-135,共10页Polymer Materials Science & Engineering

基　　金：国家教育部科学基金(18JDGC025)。

摘　　要：有机发光器件(OLED)是新一代显示屏,其中用于显示屏组件间粘接的液态光学透明胶(LOCA)是OLED的关键材料之一,高折射率、高导热性及高稳定性的LOCA对OLED性能尤为重要。文中采用八乙烯基倍半硅氧烷(OvPOSS)作为增强填料、三羟甲基丙烷三(3-巯基丙酸酯)(TTMP)作为交联剂,通过简单的UV引发硫醇-烯反应将OvPOSS接枝到具有良好黏附性和光学性能的聚氨酯丙烯酸酯(PUA)树脂中,制备出高透明性高折射率的LOCA。研究表明,制备的LOCA在365 nm UV照射20 s内即可固化,相比商用UV胶几分钟的固化时间,固化速度更快、能耗更低;当OvPOSS的质量分数为7%时,相比纯的PUA,折射率提高到1.525以上,热分解温度(T_(d5%))比纯PUA提高了30℃,玻璃化转变温度提高了5.3℃,导热系数从0.0609 W/(m·K)提高到0.1710 W/(m·K),粘接强度从3.16 MPa提高到3.48 MPa,室温日照1440 h后仍可达到99%以上的可见光透过率,水中浸渍3600 h后吸水率仅为0.52%,低于目前文献中的0.70%(24 h),在光电器件封装中具有较大应用前景。OLED display is a new generation of display to replace LCD.Liquid optically clear adhesive(LOCA)used for bonding between display components is one of the key materials of OLED.LOCA with high refractive index,high thermal conductivity and high stability is particularly important for performance of OLED.In this paper,octavinylsesimiloxane polyhedral oligomer silsesquioxane(OvPOSS)was grafted into polyurethane acrylate(PUA)resin with good adhesion and optical properties by simple UV-initiated thiol-ene reaction.LOCA with high transparency and refractive index was prepared by using OvPOSS as reinforcing filler and trimethylolpropane-tri(3-mercaptopropionate)(TTMP)as crosslinking agent.Studies show that the prepared LOCA can be cured within 20 s of 365 nm UV irradiation,the curing time of which is much shorter than that of other commercial UV adhesives,with lower energy consumption.When the mass fraction of OvPOSS is 7%,compared with pure PUA,the refractive index is increased to 1.525,the thermal decomposition temperature(T_(d5%))is increased by 30℃,the glass transition temperature is increased by 5.3℃,and the thermal conductivity is increased from 0.0609 W/(m·K)to 0.1710 W/(m·K).At the same time,the adhesion strength is increased from 3.16 MPa to 3.48 MPa,the visible light transmittance can still reach more than 99%after 1440 h sunshine irradiation at room temperature,and the water absorption rate is only 0.52%after 3600 h immersion in water,which is lower than 0.70%(24 h)in available reports.All this suggests that the OvPOSS/PUA liquid optically clear adhesive has great application prospects in the packaging of photoelectric devices.

关 键 词：液态光学透明胶 倍半硅氧烷 硫醇-烯反应 UV引发 快速固化 

分 类 号：TN383[电子电信—物理电子学]