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Modulation of dielectric properties of bismaleimide laminates by hyperbranched polyimides with different structures

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Abstract

5G communications offer high-speed transmission, low latency and high interconnect density, which requires widely used 5G devices fabricated with low dielectric constant, low loss at high frequency, high thermal conductivity, good heat resistance and high reliability, among other characteristics. In this work, hyperbranched polyimide (HBPI) was prepared by a one-step process using hexamethylenediisocyanate trimer (HDI) and toluene diisocyanate trimer (TDI) as cores and coated with methylnaldehyde. A new type of laminate was prepared using a hyperbranched polyimide resin modified with bismaleimide as the matrix resin. The hyperbranched structure of HBPI was characterised by nuclear magnetic resonance and FT-IR techniques. Dielectric property tests showed that HBPI can reduce the dielectric constant (Dk) and dielectric loss of the laminate. At 107 Hz, the dielectric constant of BMI-HBPI (HDI) laminate is 3.349 and the dielectric loss is 0.0018; the dielectric constant of BMI-HBPI (TDI) laminate is 3.501 and the dielectric loss is 0.00119. The reduction of Dk is achieved by increasing the free volume fraction in the system or reducing the content of polarisable functional groups in the system. Insulation and mechanical tests showed that the laminate has good performance characteristics, and its breakdown field strength, bending strength and fire resistance meet the requirements for copper-clad laminate of electronic class.

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Authors and Affiliations

  1. School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin, 150040, People’s Republic of China

    Qingye Wang, Xiaorui Zhang, Ling Weng, Shaohui Yan, Yuhang Wu & Chenhao Li

  2. Key Laboratory of Engineering Dielectrics and Its Application, Ministry of Education, Harbin University of Science and Technology, Harbin, 150080, People’s Republic of China

    Jiahao Shi, Xiaorui Zhang & Ling Weng

Authors
  1. Qingye Wang
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  2. Jiahao Shi
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  3. Xiaorui Zhang
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  4. Ling Weng
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  5. Shaohui Yan
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  6. Yuhang Wu
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  7. Chenhao Li
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Contributions

QW: conceptualization, methodology, formal analysis, writing—original draft. JSC: validation, writing—review & editing. XZ: conceptualization, validation, writing—review & editing, supervision. LW: supervision, project administration. SY: data curation. YW: resources. Ci: data curation.

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Correspondence to Xiaorui Zhang.

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In accordance with the code of academic ethics, I undertake the following: I declare that there is no multiple submission of this paper. I will not submit the paper elsewhere until the journal editorial process has been completed. This paper has been completed independently by me under the supervision of my supervisor. To the best of my knowledge, the quoted portions of this paper are cited with attribution, those who have contributed to the paper are stated at the author, and there is no text that infringes intellectual property rights. I accept full responsibility for any breach of intellectual property rights resulting from this paper.

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Wang, Q., Shi, J., Zhang, X. et al. Modulation of dielectric properties of bismaleimide laminates by hyperbranched polyimides with different structures. J Mater Sci: Mater Electron 35, 300 (2024). https://doi.org/10.1007/s10854-024-12015-7

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  • DOI: https://doi.org/10.1007/s10854-024-12015-7

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