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Research Article | Open Access

Molecular design of recyclable thermosetting polyimide and its composite with excellent mechanical and tribological properties

Xiaoyue WANG1,2,3, Zenghui YANG1, Tingmei WANG1,2, Qihua WANG1,2,3, Xinrui ZHANG1( ), Song LI1( )
Key Laboratory of Science and Technology on Wear and Protection of Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
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Abstract

Recyclability of thermosetting polymers and their composites is a challenge for alleviating environmental pollution and resource waste. In this study, solvent-recyclable thermosetting polyimide (PI) and its composite were successfully synthesized. The tensile strength, elongation at break, and Young’s modulus of PI are 108.70 ± 7.29 MPa, 19.35% ± 3.89%, and 2336.42 ± 128.00 MPa, respectively. The addition of reduced graphene oxide (RGO) not only enhances the mechanical properties of PI but also endows it with excellent tribological properties. The PI illustrates a high recycling efficiency of 94.15%, but the recycled composite exhibits inferior mechanical properties. The recycling and utilization of PI and its composite are realized through imine bonds (–C=N), which provides new guidance for solving the problem of environmental pollution and resource waste and is potential application in the field of sustainable tribology.

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Keywords

thermosetting polyimide (PI)recyclabilitydynamic covalent bondsfriction and wearpolymer composites

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Friction
Volume 12 Issue 3,
March 2024
Pages 452-461
DOI: 10.1007/s40544-023-0770-6

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Cite this article:
WANG X, YANG Z, WANG T, et al. Molecular design of recyclable thermosetting polyimide and its composite with excellent mechanical and tribological properties. Friction, 2024, 12(3): 452-461. https://doi.org/10.1007/s40544-023-0770-6

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Received: 17 September 2022
Revised: 15 February 2023
Accepted: 21 April 2023
Published: 04 December 2023
© The author(s) 2023.

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