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Fabrication of high-performance polyimide films by tailoring coordination bond and chain rigidity

[Display omitted] •The effect of coordination bond and chain rigidity on the crystalline structure was discussed.•Novel polyimide films with low linear thermal expansion coefficients were made.•Mechanical Properties of polyimides were enhanced by introducing coordination bonds. Coordination bonds an...

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Published in:European polymer journal 2024-06, Vol.214, p.113161, Article 113161
Main Authors: Jiang, Senjie, Zhou, Zhenjing, Zhang, Junxian, Yi, Ningbo, Wang, Junkang, Zhao, Jing, Fan, Longfei, Wu, Yancheng, Gan, Feng
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container_title European polymer journal
container_volume 214
creator Jiang, Senjie
Zhou, Zhenjing
Zhang, Junxian
Yi, Ningbo
Wang, Junkang
Zhao, Jing
Fan, Longfei
Wu, Yancheng
Gan, Feng
description [Display omitted] •The effect of coordination bond and chain rigidity on the crystalline structure was discussed.•Novel polyimide films with low linear thermal expansion coefficients were made.•Mechanical Properties of polyimides were enhanced by introducing coordination bonds. Coordination bonds and chain rigidities play severe roles in crystalline structure and property of polyimides (PIs). This study developed various polyimides with metal-diimine coordination bonds and varying chain rigidities. How coordination bonds and chain stiffness affect the semi-crystalline structure of polyimide films was investigated. Results from Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS) spectra confirmed the successful synthesis of coordinated polyimide films. Wide-angle diffraction (WAXD) results revealed that the crystallization behavior of PIs with flexible chains is significantly affected by additional coordination bonds, while the crystallization of PIs with rigid structures is primarily influenced by the chain rigidities. Compared to coordinated PIs with amorphous structure, PIs with both coordination bonds and semi-crystalline structures exhibited enhanced heat resistance, crystallinity, and dimensional stability. Notably, the coordinated PI-BP-Cu film with the highest chain rigidity in this study demonstrated excellent mechanical properties, with a tensile strength of 280 MPa, initial modulus of 5.7 GPa, and outstanding dimensional stability, characterized by a linear thermal expansion coefficient of 8.9 ppm/K (40–300 °C). These findings significantly enhance its suitability for use in metal/non-metal bonding composite materials.
doi_str_mv 10.1016/j.eurpolymj.2024.113161
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subjects Coordination bond
Dimensional stability
Polyimide
Semi-crystalline structure
title Fabrication of high-performance polyimide films by tailoring coordination bond and chain rigidity
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