Synthesis of Low-k Poly(ether ether ketone) Films and Surface Functionalization for Exceptional Copper Adhesive Properties

Moonseok Jang, Ji Hun Seo

Research output: Contribution to journalArticlepeer-review


Developing low-dielectric metal-adhesive polymer substrates for next-generation high-frequency communications and miniaturized electronic devices remains challenging. In this study, poly(ether ether ketone)-based copolymers (TBxBPy-PEEK) were synthesized via nucleophilic aromatic substitution of two aromatic alcohols: tert-butylhydroquinone and 4,4′-(α-methylbenzylidene)bisphenol. Neat film-type specimens, fabricated via solution casting with chloroform, exhibited a low dielectric constant and loss of 2.49 and 5.84 × 10-3, respectively, with a low water uptake of less than 0.5%. Furthermore, the films demonstrated excellent mechanical and thermal properties, achieving elastic moduli exceeding 0.884 GPa and initial decomposition temperatures exceeding 458.9 °C. Moreover, Cu-adhesive monomers glycidyl methacrylate and 3-(trimethoxysilyl)propyl methacrylate were successfully grafted onto the polymer surface by using the self-initiating property of the benzophenone moiety within the PEEK structure. The final Cu-polymer laminate displayed an outstanding peel strength of 11.45 N/m, more than double that of a commercially bonded sheet-laminated polyimide film.

Original languageEnglish
Pages (from-to)398-406
Number of pages9
JournalACS Applied Polymer Materials
Issue number1
Publication statusPublished - 2024 Jan 12

Bibliographical note

Publisher Copyright:
© 2023 American Chemical Society.


  • bulky side group
  • copper adhesive
  • high-frequency communication
  • low-k material
  • poly(ether ether ketone)
  • polymer grafting

ASJC Scopus subject areas

  • Process Chemistry and Technology
  • Polymers and Plastics
  • Organic Chemistry


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