Investigation into the Direct Fluorination Reaction of Colorless Polyimide Films and the Mechanism of Light Transmittance Enhancement

Ming-fei Zhong; Xiang Li; Kun Fan; Xu Wang; Xiang-yang Liu

doi:10.11777/j.issn1000-3304.2025.25091

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Investigation into the Direct Fluorination Reaction of Colorless Polyimide Films and the Mechanism of Light Transmittance Enhancement

Research Article | 更新时间：2025-10-14

- Investigation into the Direct Fluorination Reaction of Colorless Polyimide Films and the Mechanism of Light Transmittance Enhancement
- Acta Polymerica Sinica Vol. 56, Issue 10, Pages: 1757-1765(2025)
- 作者机构：
  
  1.四川大学高分子科学与工程学院成都 610065
  2.四川大学先进高分子材料全国重点实验室成都 610065
  3.四川大学电气工程学院成都 610065
- 作者简介：
  
  Xiang-yang Liu, E-mail:lxy@scu.edu.cn
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2025.25091
  CLC：
- CSTR：32057.14.GFZXB.2025.7421
- Received：04 April 2025，
  
  Accepted：23 May 2025，
  
  Published Online：14 August 2025，
  
  Published：20 October 2025
- 稿件说明：
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钟明霏, 李想, 樊坤, 王旭, 刘向阳. 无色聚酰亚胺薄膜的直接氟化反应及其增透效应研究. 高分子学报, 2025, 56(10), 1757-1765

Zhong, M. F.; Li, X.; Fan, K.; Wang, X.; Liu, X. Y. Investigation into the direct fluorination reaction of colorless polyimide films and the mechanism of light transmittance enhancement. Acta Polymerica Sinica, 2025, 56(10), 1757-1765
钟明霏, 李想, 樊坤, 王旭, 刘向阳. 无色聚酰亚胺薄膜的直接氟化反应及其增透效应研究. 高分子学报, 2025, 56(10), 1757-1765 DOI： 10.11777/j.issn1000-3304.2025.25091. CSTR： 32057.14.GFZXB.2025.7421.

Zhong, M. F.; Li, X.; Fan, K.; Wang, X.; Liu, X. Y. Investigation into the direct fluorination reaction of colorless polyimide films and the mechanism of light transmittance enhancement. Acta Polymerica Sinica, 2025, 56(10), 1757-1765 DOI： 10.11777/j.issn1000-3304.2025.25091. CSTR： 32057.14.GFZXB.2025.7421.

摘要

本文采用直接氟气氟化技术对无色透明聚酰亚胺(CPI)薄膜进行了表面氟化改性，即通过通入定量的F

混合气体，成功制备了表面氟化CPI薄膜. 在不影响其力学性能的情况下，F-CPI的透光率得到了大幅提升，其在400~800 nm可见光范围内的平均透光率由氟化前的87.5%增加至90.5%，整体透光率实现了3%的提升. X射线光电子能谱(XPS)测试结果表明，直接氟化后薄膜表面的F元素含量明显增加；进一步分析表明，F

主要进攻CPI分子链中的苯环结构，并在苯环上引入了大量的C―F和C―F

键. 同时，F-CPI透光率的提升不是由于氟化后表面形貌结构的改变，而是由于氟原子低的摩尔体积折射率带来的反射率降低，进而实现高效的增透作用. 最后，我们将直接氟化后的薄膜分别与柔性显示领域常用的光学胶(OCA)和表面硬涂液复合，其制备的两种复合薄膜均同样显示出良好的透光性增强效果，具有明显的应用前景.

Abstract

The surface of colorless polyimide (CPI) film was modified using a direct fluorination method

and a surface-fluorinated CPI (F-CPI) was successfully prepared by introducing a specific volume ratio of F

mixed gas. The transparency of the F-CPI film was significantly enhanced without compromising its mechanical properties. Specifically

the average transmittance (

avg

) of the F-CPI film in the visible light range of 400-800 nm increased from 87.5% before fluorination to 90.5%

corresponding to a 3% overall improvement in transmittance. X-ray photoelectron spectroscopy (XPS) analysis revealed a substantial increase in the fluorine content on the surface of the F-CPI film. Further investigation indicated that F

primarily targets the benzene ring and imide ring structures within the CPI molecular chain

leading to the formation of a large number of C―F and C―F

bonds on the benzene ring. Scanning electron microscopy (SEM) results demonstrated that the enhanced transmittance of the F-CPI film was not due to changes in surface morphology or structure following fluorination

but rather to the anti-reflection effect resulting from the low molar refractive index of fluorine atoms

which reduces reflectivity. Subsequently

the fluorinated film was combined with commonly used optical

OCA adhesives and surface hard coating solutions in the field of flexible displays to prepare two types of composite films. Both composite films exhibited significant improvements in transparency and hold broad application prospects in practical fields.

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Related Institution

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