Construction and self‐healing properties of thermoplastic polyimide based on dynamic covalent bonding

Author:

Gao Yuanjie1ORCID,Shi Jiahao2ORCID,Zhang Xiaorui12,Weng Ling12ORCID,Sun Xue2,Liu Laiweiqing1

Affiliation:

1. School of Materials Science and Chemical Engineering Harbin University of Science and Technology Harbin People's Republic of China

2. Key Laboratory of Engineering Dielectrics and Its Application, Ministry of Education Harbin University of Science and Technology Harbin People's Republic of China

Abstract

AbstractMechanical damage to the surface of polyimide during manufacture and utilization may act as critical determinants of the properties and longevity of the material. In order to address this issue, this study prepared thermoplastic polyimide (TPI) films through the copolymerization of isocyanate and acid anhydride, which possesses superior self‐healing ability after being mechanical damaged. Moreover, polyimide films still retain its exceptional tensile strength (>90 MPa) with Young's modulus (E) (>3 GPa), high thermal stability (glass transition temperature (Tg) >220°C), and excellent insulation performance (breakdown strength (Eb) >180 kV/mm) after self‐healing. Introducing cross‐linked structures and flexible groups into the thermoplastic resin matrix appropriately not only imparts self‐healing capabilities to the material but also retains its excellent mechanical properties. The combination of straightforward copolymerization and distinctive self‐healing prowess renders it an appropriate strategy for confronting self‐healing challenges.

Funder

National Key Research and Development Program of China

Publisher

Wiley

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