Effect of Low-temperature Imidization on Properties and Aggregation Structures of Polyimide Films with Different Rigidity

Yan Jia; Lei Zhai; Song Mo; Yi Liu; Li-Xin Liu; Xin-Yu Du; Min-Hui He; Lin Fan

doi:10.1007/s10118-024-3137-1

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Effect of Low-temperature Imidization on Properties and Aggregation Structures of Polyimide Films with Different Rigidity

RESEARCH ARTICLE | Updated：2024-08-06

- Effect of Low-temperature Imidization on Properties and Aggregation Structures of Polyimide Films with Different Rigidity
- Chinese Journal of Polymer Science Vol. 42, Issue 8, Pages: 1134-1146(2024)
- Affiliations：
  
  a.Key Laboratory of Science and Technology on High-tech Polymer Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
  b.School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
- Author bio：
  
  zhailei@iccas.ac.cn (L.Z.)
  fanlin@iccas.ac.cn (L.F.)
- Funds：
- DOI：10.1007/s10118-024-3137-1
  CLC：
- Received：05 March 2024，
  
  Revised：2024-04-01，
  
  Accepted：07 April 2024，
  
  Online First：17 May 2024，
  
  Published：01 August 2024
- Accepted：
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Jia, Y.; Zhai, L.; Mo, S.; Liu, Y.; Liu, L. X.; Du, X. Y.; He, M. H.; Fan, L. Effect of low-temperature imidization on properties and aggregation structures of polyimide films with different rigidity. Chinese J. Polym. Sci. 2024, 42, 1134–1146

Yan Jia, Lei Zhai, Song Mo, et al. Effect of Low-temperature Imidization on Properties and Aggregation Structures of Polyimide Films with Different Rigidity[J]. Chinese Journal of Polymer Science, 2024, 42(8): 1134-1146.
Jia, Y.; Zhai, L.; Mo, S.; Liu, Y.; Liu, L. X.; Du, X. Y.; He, M. H.; Fan, L. Effect of low-temperature imidization on properties and aggregation structures of polyimide films with different rigidity. Chinese J. Polym. Sci. 2024, 42, 1134–1146 DOI： 10.1007/s10118-024-3137-1.

Yan Jia, Lei Zhai, Song Mo, et al. Effect of Low-temperature Imidization on Properties and Aggregation Structures of Polyimide Films with Different Rigidity[J]. Chinese Journal of Polymer Science, 2024, 42(8): 1134-1146. DOI： 10.1007/s10118-024-3137-1.

摘要

A series of polyimide films with different flexible and rigid structures were prepared by low-temperature imidization method using the catalyst of imidazole

and the effect of chemical catalysis on film properties and aggregation structures was investigated. The chemically catalyzed imidization method promotes the degree of imidization reaction and induces the orientation of molecular chains

and the tensile strength and elongation at break of films are significantly improved.

Abstract

The traditional high-temperature preparation process of polyimide can cause many problems and limits the wider application in extreme conditions. An important challenge to be solved urgently is the reduction of imidization temperature. In this work

twelve kinds of polyimide films with different chain rigidity were prepared at low temperature of 200 °C

in the absence or presence of imidazole used as the catalyst. The molecular rigidity and free volume were theoretically calculated

and relationship between structure and properties were systematically studied. The results show that imidization reaction under low temperatures is significantly affected by the rigidity of molecular chains. The rigid structure of polyimide is not conducive to the low-temperature imidization

but this adverse effect can be eliminated by adding catalyst

resulting the notably increased imidization degree. The optical and thermal properties can be improved to a certain extent for the chemically catalyzed system

resulting in relatively higher heat resistance and thermal stability. While the mechanical performance could be determined by complicating factors

greatly different from polyimide films prepared by high temperature method. To investigate aggregation structures of films

the effect of chain rigidity and catalyst on the stacking or orientation of molecular chains was further elaborated. This work can contribute to the understanding of chemically catalyzed imidization that is rarely reported in the existing research

and will provide guidance for the low-temperature preparation of high-performance polyimides.

关键词

Keywords

references

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