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

Fan Bai; Yi-wen Jiang; Xiu-ting Li; Jie Dong; Xin Zhao; Qing-hua Zhang

doi:10.11777/j.issn1000-3304.2024.24077

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

Research Article | 更新时间：2024-11-15

- Fabrication and Characteristics of Bend-durable, Colorless Transparent Polyimide Films for Flexible Display Cover Applications
- Acta Polymerica Sinica Vol. 55, Issue 10, Pages: 1393-1404(2024)
- 作者机构：
  
  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
- 作者简介：
  
  Xiu-ting Li, E-mail: lixiuting@dhu.edu.cn
  Qing-hua Zhang, E-mail: qhzhang@dhu.edu.cn
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2024.24077
  CLC：
- Published：20 October 2024，
  
  Published Online：11 June 2024，
  
  Received：12 March 2024，
  
  Accepted：19 April 2024
- 稿件说明：
移动端阅览
白帆, 江怡雯, 李琇廷, 董杰, 赵昕, 张清华. 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. 高分子学报, 2024, 55(10), 1393-1404

Bai, F.; Jiang, Y. W.; Li, X. T.; Dong, J.; Zhao, X.; Zhang, Q. H. Fabrication and characteristics of bend-durable, colorless transparent polyimide films for flexible display cover applications. Acta Polymerica Sinica, 2024, 55(10), 1393-1404
白帆, 江怡雯, 李琇廷, 董杰, 赵昕, 张清华. 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. 高分子学报, 2024, 55(10), 1393-1404 DOI： 10.11777/j.issn1000-3304.2024.24077.

Bai, F.; Jiang, Y. W.; Li, X. T.; Dong, J.; Zhao, X.; Zhang, Q. H. Fabrication and characteristics of bend-durable, colorless transparent polyimide films for flexible display cover applications. Acta Polymerica Sinica, 2024, 55(10), 1393-1404 DOI： 10.11777/j.issn1000-3304.2024.24077.

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(

) (

88%)，同时具有较低的线性膨胀系数(CTE) (

1.3×10

-5

-1

)、较高的玻璃化转变温度(

) (≥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

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.

Abstract

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 (

88%)

along with minimal coefficients of thermal expansion (CTE) (

1.3×10

-5

-1

)

elevated glass transition temperatures (

) (≥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

bending cycles

the film maintained over 99% of their original average transmittance (

) 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

Keywords

Colorless transparent polyimideBend-durableFlexible display coversHigh temperature-resistance

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