Fluorine Substitution Effect on the Material Properties in Transparent Aromatic Polyimides

Wei-Feng Peng; Huan-Yu Lei; Xin-Xin Zhang; Lu-Hao Qiu; Ming-Jun Huang

doi:10.1007/s10118-022-2702-8

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Fluorine Substitution Effect on the Material Properties in Transparent Aromatic Polyimides

RESEARCH ARTICLE | Updated：2022-06-22

- Fluorine Substitution Effect on the Material Properties in Transparent Aromatic Polyimides
- Chinese Journal of Polymer Science Vol. 40, Issue 7, Pages: 781-788(2022)
- Affiliations：
  
  a.South China Advanced Institute for Soft Matter Science and Technology, School of Emergent Soft Matter, South China University of Technology, Guangzhou 510640, China
  b.Guangdong Provincial Key Laboratory of Functional and Intelligent Hybrid Materials and Devices, South China University of Technology, Guangzhou 510640, China
- Author bio：
  
  huangmj25@scut.edu.cn
- Funds：
- DOI：10.1007/s10118-022-2702-8
  CLC：
- Received：24 November 2021，
  
  Revised：2022-1-19，
  
  Accepted：24 January 2022，
  
  Online First：24 April 2022，
  
  Published：01 July 2022
- Accepted：
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Peng, W. F.; Lei, H. Y.; Zhang, X. X.; Qiu, L. H.; Huang, M. J. Fluorine substitution effect on the material properties in transparent aromatic polyimides. Chinese J. Polym. Sci. 2022, 40, 781–788

Wei-Feng Peng, Huan-Yu Lei, Xin-Xin Zhang, et al. Fluorine Substitution Effect on the Material Properties in Transparent Aromatic Polyimides[J]. Chinese Journal of Polymer Science, 2022, 40(7): 781-788.
Peng, W. F.; Lei, H. Y.; Zhang, X. X.; Qiu, L. H.; Huang, M. J. Fluorine substitution effect on the material properties in transparent aromatic polyimides. Chinese J. Polym. Sci. 2022, 40, 781–788 DOI： 10.1007/s10118-022-2702-8.

Wei-Feng Peng, Huan-Yu Lei, Xin-Xin Zhang, et al. Fluorine Substitution Effect on the Material Properties in Transparent Aromatic Polyimides[J]. Chinese Journal of Polymer Science, 2022, 40(7): 781-788. DOI： 10.1007/s10118-022-2702-8.

摘要

The effect of fluorinated biphenyl diamine monomers on the properties of polyimides was systematically investigated. With comparable optical transparency to trifluoromethyl substitution

the simple fluoro group brings the advantages of dense polymer chain packing and thus improved thermal

dimensional and mechanical properties.

Abstract

The recent development of flexible display technology raised additional requirements for optical and electric properties of polyimides

accelerating the structure and property tunning of transparent polyimides. The unique electronic effect and steric hindrance effect of fluorine substitutions make fluorine-containing polyimides occupy an important position in the transparent polyimide family. In this work

a series of transparent aromatic polyimides were prepared from a fixed 4

4’-(hexafluoroisopropylidene) diphthalic anhydride (6FDA) and biphenyl diamines with different substitute groups at the 2

2’

6’-positions. We systematically studied the effects of pendant groups on the thermal

mechanical

optical and dielectric properties of these 6FDA-based polyimides with the aid of density function theory (DFT) calculation. In particular

we paid special attention to the simple but compact fluoro group substitution. The simple fluoro substitution brought the advantages of maintaining the linearity of the backbone and dense polymer chain packing

which would minimize the weakening of polyimides’ inherent thermal

dimensional and mechanical properties. Comparing with trifluoromethyl substituted polyimides with the best optical transparency

polyimides containing fluoro substitutes exhibited slightly decreased optical transparency

but increased thermal and dimensional stability and higher mechanical strength. These results could shed light on the ultimate transparent polyimide film development toward the application in extreme working condition

e.g

the colorless polyimide substrate film for the flexible display technology.

关键词

Keywords

references

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