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Low Dielectric Benzocyclobutene-type Polymers Based on Facile Synthesis of Linear Fluorinated Monomer

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Abstract

A linear fluorinated benzocyclobutene-type monomer (4F-bis-BCB) was facilely synthesized by a one-step copper-catalyzed etherification reaction and a simple precipitation post-purification method. Moreover, a series of BCB-based polymeric low-dielectric (low-k) materials were obtained by the thermal-induced ring-opening copolymerization of 4F-bis-BCB with divinyl tetramethyl disiloxane-bisbenzocyclobutene (DVS-BCB) monomer and further simple thermal curing at high temperature (200–300 °C). The resultant fully cured materials demonstrated excellent low dielectric properties at high frequency of 10 GHz (dielectric constant (Dk)<2.6, dielectric loss (Df)<1.57×10−2), great hydrophobicity (water contact angle >116°), ultra-low water absorption (<0.19% after soaked in water at room temperature for 60 h) and excellent planarization ability (surface roughness<0.56 nm of 3 µm-thick film). Overall, this new fluorinated BCB-type monomer provides us an alternative for the facile preparation of low-k polymeric materials and exhibits great potential for future applications in high-frequency communication and three-dimensional high-density packaging technologies.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (No. 22075298) and the Beijing Municipal Natural Science Foundation (No. 2212053).

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Authors and Affiliations

  1. Key Laboratory of Science and Technology on High-Tech Polymer Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China

    Quan Sun, Wen-Jie Fan, Meng-Lu Li & Wen-Xin Fu

  2. School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China

    Quan Sun, Wen-Jie Fan, Meng-Lu Li & Wen-Xin Fu

  3. Key Laboratory of Chemical Biology of Hebei Province, College of Chemistry and Environmental Science, Hebei University, Baoding, 071002, China

    Zi-Wei Yuan

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  1. Quan Sun
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Correspondence to Wen-Xin Fu.

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Sun, Q., Yuan, ZW., Fan, WJ. et al. Low Dielectric Benzocyclobutene-type Polymers Based on Facile Synthesis of Linear Fluorinated Monomer. Chin J Polym Sci 41, 1760–1766 (2023). https://doi.org/10.1007/s10118-023-2955-x

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  • DOI: https://doi.org/10.1007/s10118-023-2955-x

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