Mechanically robust and thermally stable electrochemical devices based on star-shaped random copolymer gel-electrolytes

Heedong Hwang, Jaeyong Lee, So Yeong Park, Yeseong Seo, Yong Min Kim, Jin Kon Kim, Hong Chul Moon

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


We synthesized 6-arm star-shaped polystyrene-ran-poly(methyl methacrylate) copolymers ((S-r-M)6) for mechanically robust and thermally stable ion gels containing an ionic liquid of 1-ethyl-3-methylimidazolium bis(trifluoromethyl sulfonyl)imide ([EMI][TFSI]). The (S-r-M)6-based gels exhibited higher elastic modulus (E ∼ 1.67 × 105 Pa), which is more than five-times that (∼0.29 × 105 Pa) of linear PS-r-PMMA-based ion gels at the same Sty content (∼29 mol%), irrespective of applied mechanical strains (stretching and compression). In addition, they showed outstanding thermal stability. For example, the gel-sol transition temperature (Tgel) of (S-r-M)6 gels was ∼72 °C, compared with that (∼56 °C) of linear PS-r-PMMA-based ion gels. These physical properties of gels were further improved by increasing total molecular weight and the fraction of styrene, giving E of ∼3.8 × 105 Pa and Tgel of ∼163 °C. The resulting gels were functionalized by introducing electrochemiluminescence luminophores (tris(2,2′-bipyridyl)ruthenium(II) hexafluorophosphate). By utilizing the mechanical robustness of the (S-r-M)6 gels, we fabricated emissive electrochemical displays through ‘cut-and-stick’ process. Moreover, the thermally stable (S-r-M)6 gels indicated good dimensional stability, offering a chance to demonstrate ECL devices that operate even at high temperatures.

Original languageEnglish
Pages (from-to)233-240
Number of pages8
JournalJournal of Industrial and Engineering Chemistry
StatePublished - 25 Aug 2020


  • Electrochemical displays
  • Electrochemiluminescence
  • Ion gels
  • Polymer gel electrolytes
  • Star-shaped random copolymers


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