Highly Hydrolysis-Resistant Polyimide Fibers Prepared by Thermal Crosslinking with Inherent Carboxyl Groups

Shi-Xu Zhou; Jie Dong; Xiu-Ting Li; Xin Zhao; Qing-Hua Zhang

doi:10.1007/s10118-023-3015-2

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Highly Hydrolysis-Resistant Polyimide Fibers Prepared by Thermal Crosslinking with Inherent Carboxyl Groups

RESEARCH ARTICLE | Updated：2024-01-12

- Highly Hydrolysis-Resistant Polyimide Fibers Prepared by Thermal Crosslinking with Inherent Carboxyl Groups
- Chinese Journal of Polymer Science Vol. 42, Issue 2, Pages: 247-255(2024)
- Affiliations：
  
  State Key Laboratory for Modification of Chemical Fibres and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China
- Author bio：
  
  qhzhang@dhu.edu.cn
- Funds：
- DOI：10.1007/s10118-023-3015-2
  CLC：
- Received：04 April 2023，
  
  Revised：2023-5-12，
  
  Accepted：05 June 2023，
  
  Online First：07 August 2023，
  
  Published：01 February 2024
- Accepted：
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Zhou, S. X.; Dong, J.; Li, X. T.; Zhao, X.; Zhang, Q. H. Highly hydrolysis-resistant polyimide fibers prepared by thermal crosslinking with inherent carboxyl groups. Chinese J. Polym. Sci. 2024, 42, 247–255

Shi-Xu Zhou, Jie Dong, Xiu-Ting Li, et al. Highly Hydrolysis-Resistant Polyimide Fibers Prepared by Thermal Crosslinking with Inherent Carboxyl Groups[J]. Chinese Journal of Polymer Science, 2024, 42(2): 247-255.
Zhou, S. X.; Dong, J.; Li, X. T.; Zhao, X.; Zhang, Q. H. Highly hydrolysis-resistant polyimide fibers prepared by thermal crosslinking with inherent carboxyl groups. Chinese J. Polym. Sci. 2024, 42, 247–255 DOI： 10.1007/s10118-023-3015-2.

Shi-Xu Zhou, Jie Dong, Xiu-Ting Li, et al. Highly Hydrolysis-Resistant Polyimide Fibers Prepared by Thermal Crosslinking with Inherent Carboxyl Groups[J]. Chinese Journal of Polymer Science, 2024, 42(2): 247-255. DOI： 10.1007/s10118-023-3015-2.

摘要

The hydrolysis resistance of polyimide fibers can be improved by crosslinking of the macromolecular chains. Crosslinked polyimide fibers were produced by intrinsic carboxyl decarboxylation. The oriented macromolecules and chemically crosslinked structure improved the tightness of the molecular chains and endowed the CPI fibers with excellent hydrolytic resistance.

Abstract

Easy hydrolysis in alkaline environments limits the use of polyimide fibers in environmental protection. The hydrolysis resistance levels of polyimide fibers can be improved by crosslinking of the macromolecular chains. In this work

crosslinked polyimide fibers (CPI fibers) were produced by intrinsic carboxyl decarboxylation for the first time. The thermal stability of the polyimide fibers containing the intrinsic carboxyl groups (PIC fibers) was studied

and the temperature of the decarboxylation-crosslinking reaction was determined to be 450 °C. The PIC fibers were hot-drawn to initiate thermal crosslinking of the carboxyl groups and molecular chain orientation at high temperature. The CPI fibers had high tensile strengths (0.72−1.46 GPa) and compressive strengths (401−604 MPa). The oriented macromolecules and chemically crosslinked structure improved the tightness of the molecular chains and endowed the CPI fibers with excellent hydrolytic resistance. The CPI-50 fiber did not dissolve in a 0.5 wt% NaOH solution during heating at 90 °C for 10 h

and the tensile strength retention reached 87% when treated in 0.5 wt% NaOH solutions at 90 °C for 1 h

providing a guarantee for its application in alkaline corrosive environments.

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