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

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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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Acknowledgments

This work was financially supported by the Scientific Research Innovation Plan of Shanghai Education Commission (No. 2019-01-07-00-03-E00001), the National Natural Science Foundation of China (Nos. U21A2087 and 21975040) and the Natural Science Foundation of Shanghai (No. 21ZR1400200).

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Authors and Affiliations

  1. State Key Laboratory for Modification of Chemical Fibres and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, China

    Shi-Xu Zhou, Jie Dong, **u-Ting Li, **n Zhao & Qing-Hua Zhang

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  1. Shi-Xu Zhou
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  2. Jie Dong
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  4. **n Zhao
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Correspondence to Qing-Hua Zhang.

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Zhou, SX., Dong, J., Li, XT. et al. Highly Hydrolysis-Resistant Polyimide Fibers Prepared by Thermal Crosslinking with Inherent Carboxyl Groups. Chin J Polym Sci 42, 247–255 (2024). https://doi.org/10.1007/s10118-023-3015-2

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