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Novel polyethersulfone dielectric films with high temperature resistance, intrinsic low dielectric constant and low dielectric loss

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Abstract

In this work, a series of fluorene-containing fluorinated polyethersulfone (PES-6AF/BHPF) copolymers with high temperature resistance and intrinsic low dielectric constant (low-ε) have been designed and synthesized from 4,4′-dichlorophenyl sulfone (DCS) and polyphenol. The performance of obtained PES-6AF/BHPF can be controlled and optimized by controlling the copolymers structure. The thermal and dielectric properties of PES-6AF/BHPF were evaluated comprehensively. The obtained PES-6AF/BHPF copolymers show high glass transition temperatures (Tg) ranging from 200 to 260 °C, and 5% weight loss temperatures (Td5%) is stable up to 500 °C. The ε value of PES-6AF/BHPF-0% and PES-6AF/BHPF-100% are as low as 2.1 and 2.3, and the loss tangent (tan δ) are only 0.0088 and 0.003 at 1 kHz, respectively. In addition, all of PES-6AF/BHPF films show good stability of dielectric properties in high temperature conditions. More importantly, the PES-6AF/BHPF copolymers are soluble in common solvents (such as DMAc, NMP, DMF, THF). The PES-6AF/BHPF copolymers are amorphous and can be easily cast into transparent and flexible films with tensile strength of 62–74 MPa and an elongation at break of 13.3–15.8%. The outstanding comprehensive properties made it possible to be the most promising polymer candidates for high-performance interlayer dielectrics.

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Acknowledgements

The authors wish to thank for the Opening Project of Key Laboratories of Fine Chemicals and Surfactants in Sichuan Provincial Universities (2018JXY04), Opening Project of Material Corrosion and Protection Key Laboratory of Sichuan province (2019CL04) and Major Project of Education Department in Sichuan (18ZA0346), Key science and technology planning project of Zigong (2019YYJC04).

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Authors and Affiliations

  1. College of Materials Science and Engineering, Material Corrosion and Protection Key Laboratory of Sichuan province, Key Laboratories of Fine Chemicals and Surfactants in Sichuan Provincial Universities, Sichuan University of Science & Engineering, Zigong, 643000, China

    Zejun Pu, Jialing Xia, Xueyu Liu, Qi Wang, Jingyue Liu, Xiaohang He & Jiachun Zhong

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  1. Zejun Pu
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  2. Jialing Xia
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  7. Jiachun Zhong
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Zejun Pu and Jialing Xia contributed equally to this work, and they are the co-first author. Besides, all the authors approved the final version of the manuscript.

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Correspondence to Zejun Pu.

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Pu, Z., Xia, J., Liu, X. et al. Novel polyethersulfone dielectric films with high temperature resistance, intrinsic low dielectric constant and low dielectric loss. J Mater Sci: Mater Electron 32, 967–976 (2021). https://doi.org/10.1007/s10854-020-04873-8

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  • DOI: https://doi.org/10.1007/s10854-020-04873-8

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