Frank–Kasper Phases Identified in PDMS-b-PTFEA Copolymers with High Conformational Asymmetry

Seungbae Jeon, Taesuk Jun, Seongjun Jo, Hyungju Ahn, Seungwoo Lee, Byeongdu Lee, Du Yeol Ryu

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43 Citations (Scopus)


In the search for the formation of Frank–Kasper phases from diblock copolymer self-assembly, a series of compositionally asymmetric poly(dimethylsiloxane)-b-poly(2,2,2-triflouroethyl acrylate)s (PDMS-b-PTFEAs) are synthesized to produce PDMS-rich phases with PDMS volume fractions (fPDMS) ranging from 0.746 to 0.869. As determined by small-angle X-ray scattering analysis, the Frank–Kasper σ and C14 phases are identified at fPDMS = 0.796 and 0.851, respectively, plausibly due to high conformational asymmetry (ε ≈ 2.20) between the two blocks. Intriguingly, the σ phase develops during heating from a short-range liquid-like packing (LLP) state, whereas the C14 phase is achieved at room temperature, which are both followed by a disordering at higher temperatures. Based on thermal experiments from a super cooled disordered state, the findings further provide compelling evidence of an LLP-hexagonally packed cylinder-σ transition and a direct pathway to the C14 phase during heating from an LLP state.

Original languageEnglish
Article number1900259
JournalMacromolecular Rapid Communications
Issue number19
Publication statusPublished - 2019 Oct 1


  • Frank–Kasper phases
  • block copolymers
  • conformational asymmetry
  • quasicrystals
  • self-assembly

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry


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