Preparation of Colorless Transparent Polyimide Films and Their Performance Evolution under UV Aging and Dynamic Bending

Yue Zhang; Rui Shang; Wen-xin Gong; Xiu-ting Li; Jie Dong; Xin Zhao; Qing-hua Zhang

doi:10.11777/j.issn1000-3304.2026.26108

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Preparation of Colorless Transparent Polyimide Films and Their Performance Evolution under UV Aging and Dynamic Bending

更新时间：2026-07-10

- Preparation of Colorless Transparent Polyimide Films and Their Performance Evolution under UV Aging and Dynamic Bending
- Acta Polymerica Sinica Pages: 1-14(2026)
- 作者机构：
  
  东华大学材料科学与工程学院先进纤维材料全国重点实验室上海 201620
- 作者简介：
  
  Xiu-ting Li, E-mail: lixiuting@dhu.edu.cn
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2026.26108
  CLC：
- CSTR：32057.14.GFZXB.2026.7633
- Received：05 April 2026，
  
  Accepted：18 May 2026，
  
  Online First：10 July 2026，
- 稿件说明：
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张月, 尚瑞, 龚文昕, 李琇廷, 董杰, 赵昕, 张清华. 无色透明聚酰亚胺薄膜的制备及其在紫外老化和动态弯折下的性能演变. 高分子学报, doi: 10.11777/j.issn1000-3304.2026.26108.

Zhang, Y.; Shang, R.; Gong, W. X.; Li, X. T.; Dong, J.; Zhao, X.; Zhang, Q. H. Preparation of colorless transparent polyimide films and their performance evolution under UV aging and dynamic bending. Acta Polymerica Sinica (in Chinese), doi: 10.11777/j.issn1000-3304.2026.26108.
张月, 尚瑞, 龚文昕, 李琇廷, 董杰, 赵昕, 张清华. 无色透明聚酰亚胺薄膜的制备及其在紫外老化和动态弯折下的性能演变. 高分子学报, doi: 10.11777/j.issn1000-3304.2026.26108. DOI： CSTR： 32057.14.GFZXB.2026.7633.

Zhang, Y.; Shang, R.; Gong, W. X.; Li, X. T.; Dong, J.; Zhao, X.; Zhang, Q. H. Preparation of colorless transparent polyimide films and their performance evolution under UV aging and dynamic bending. Acta Polymerica Sinica (in Chinese), doi: 10.11777/j.issn1000-3304.2026.26108. DOI： CSTR： 32057.14.GFZXB.2026.7633.

摘要

柔性显示盖板材料面临高透明、耐高温与复杂服役可靠性之间的平衡难题. 本工作通过调控分子链刚柔性与自由体积，制备了一系列无色透明聚酰亚胺(CPI)薄膜. 研究发现，随着分子链刚性的增大，样品的玻璃化转变温度(

)和疏水性更优而力学性能则与分子链堆砌密度和氢键含量呈现更强的相关性. 其中，含刚性非共轭环丁烷结构的CPI-CBDA因自由体积小、氢键多、分子链堆积紧密，兼具高透明(380~780 nm的平均透过率

=87.02%)、高耐热、低膨胀(50~250 ℃的平均热膨胀系数CTE=10.52×10

-6

/K)及优异的力学性能. 在服役评价方面，经50万次动态弯折(弯折半径

=2 mm)后，大部分样品的

损失率低于3%，拉伸强度保持率高于85%，而商业化PET薄膜的强度保持率低于56%. 值得注意的是，部分样品弯折后其杨氏模量反而增大，可能是由于局部循环应变诱导分子链取向造成的. 紫外老化研究表明，CPI-CBDA稳定性最佳，其老化机理呈现阶段性特征：初期环丁烷结构分解，随后弱键断裂，与此同时分子链间发生交联反应，协同补偿力学性能的劣化，使其经紫外辐照后

保持率高达97.1%，拉伸强度与模量保持率甚至达到119.4%和140.1%.

Abstract

Flexible display cover materials face the challenge of balancing high transparency

high temperature resistance

and complex service reliability. In this work

a series of colorless transparent polyimide (CPI) films were prepared by regulating the rigidity of molecular chains and free volume. It was found that as the rigidity of the molecular chains increased

the glass transition temperature (

) and hydrophobicity of the samples improved

while the mechanical properties showed a stronger correlation with the packing density of the molecular chains and the content of hydrogen bonds. Among them

CPI-CBDA

which contains a rigid non-conjugated cyclobutane structure

has small free volume

many hydrogen bonds

and a tightly packed molecular chain

and thus combines high transparency (average transmittance

in the range of 380-780 nm was 87.02%)

high heat resistance

low expansion (average thermal expansion coefficient CTE in the temperature range of 50-250 ℃ was 10.52×10

-6

/K)

and excellent mechanical properties. In terms of service evaluation

after 5×10

dynamic bends (bend radius

=2 mm)

the

loss rate of most samples was less than 3%

and the tensile strength retention rate was higher than 85%

while the strength retention rate of commercial PET films was lower than 56%. It is worth noting that after bending

the Young's modulus of some samples increased instead

possibly due to the local cyclic strain inducing molecular chain orientation. The ultraviolet aging study shows that CPI-CBDA has the b

est stability. Its aging mechanism shows a staged characteristic: initially

the cyclobutane structure decomposes

then weak bonds break

while cross-linking reactions occur between molecular chains simultaneously

compensating for the degradation of mechanical properties

and its

retention rate after ultraviolet irradiation is as high as 97.1%

and the retention rates of tensile strength and modulus even reach 119.4% and 140.1%.

关键词

Keywords

references

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