柔性显示盖板用耐弯折无色透明聚酰亚胺薄膜的制备与性能  

Fabrication and Characteristics of Bend-durable,Colorless Transparent Polyimide Films for Flexible Display Cover Applications

作　　者：白帆 江怡雯 李琇廷 董杰[1] 赵昕[1] 张清华[1] Fan Bai;Yi-wen Jiang;Xiu-ting Li;Jie Dong;Xin Zhao;Qing-hua Zhang(State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,School of Materials Science and Engineering,Donghua University,Shanghai 201620)

机构地区：[1]纤维材料改性国家重点实验室东华大学材料科学与工程学院,上海201620

出　　处：《高分子学报》2024年第10期1393-1404,共12页Acta Polymerica Sinica

基　　金：国家重点研发计划(项目号2022YFB3603102);国家自然科学基金(基金号U21A2087,52203033);中央高校基本科研业务费资助.

摘　　要：随着显示领域的不断发展,柔性显示盖板用无色透明聚酰亚胺(CPI)薄膜的研发备受关注.本研究中,通过使用商业化酸酐和二胺单体,调控主链结构、氟含量和分子间氢键,进而实现了薄膜透明性、尺寸稳定性、耐热性和机械性能之间的平衡;制备的CPI-2-TF薄膜有优异的平均光学透过率(T_(av))(>88%),同时具有较低的线性膨胀系数(CTE)(<1.3×10^(-5) K^(-1))、较高的玻璃化转变温度(T_(g))(≥380℃)和优良的机械性能,为CPI的商业化进程和大规模制备提供基础.此外,本研究重点考察了CPI-2-TF的耐弯折稳定性,弯折20万次后的薄膜基本没有任何变化,其T_(av)保持率在99%以上,力学性能仅下降4%;进一步弯折40万次后,薄膜的光学性能基本不变,力学性能保持率在92%以上,在折叠屏手机等领域展示出较高的应用潜力.As the display industry evolves,the research and development of colorless transparent polyimide(CPI)films for use in flexible display covers have become increasingly prominent.This study leverages commercial anhydrides and diamine monomers to fine-tune the main chain structure,fluorine content,and intermolecular hydrogen bonding,thereby achieving an equilibrium among transparency,dimensional stability,thermal resistance,and mechanical strength of the films.The produced CPI-2-TF film showcases exceptional optical average transmittance(Tav>88%),along with minimal coefficients of thermal expansion(CTE)(<1.3×10^(-5) K^(-1)),elevated glass transition temperatures(T_(g))(≥380℃),and superior mechanical properties.These attributes establish a robust foundation for the commercialization and mass production of CPI.Moreover,this study specifically examines the bend-durability of CPI-2-TF.After 2×10^(5) bending cycles,the film maintained over 99% of their original average transmittance(Tav)and exhibited a mere 4% decrease in mechanical properties.Upon extending the bending to 400k cycles,the films retained virtually unchanged optical performance and over 92% of their mechanical integrity,demonstrating high potential for applications in folding screen smartphones and similar devices.

关 键 词：无色透明聚酰亚胺 耐弯折性能 柔性显示盖板 耐高温 

分 类 号：TQ323.7[化学工程—合成树脂塑料工业] TB383.2[一般工业技术—材料科学与工程]