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

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

doi:10.1002/marc.201900259

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

Journal Article · 10 July 2019 · Macromolecular Rapid Communications

DOI: https://doi.org/10.1002/marc.201900259 · OSTI ID:1574376

Jeon, Seungbae ^[1]; Jun, Taesuk ^[1]; Jo, Seongjun ^[2]; Ahn, Hyungju ^[3]; Lee, Seungwoo ^[4]; Lee, Byeongdu ^[5];

^[1]

Yonsei Univ., Seoul (South Korea). Dept. of Chemical and Biomolecular Engineering
S. Jeon, T. Jun, S. Jo, Prof. D. Y. RyuDepartment of Chemical and Biomolecular EngineeringYonsei University 50 Yonsei‐ro Seodaemun‐gu Seoul 03722 Korea
Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of). Pohang Accelerator Lab.
Korea Univ., Seoul (South Korea). HU-KIST Graduate School of Converging Science and Technology, and Dept. of Biomicrosystem Technology
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

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 (f_PDMS) ranging from 0.746 to 0.869. As determined by small-angle X-ray scattering analysis, the Frank-Kasper sigma and C14 phases are identified at f_PDMS = 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. Finally, 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.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: Samsung Electronics, Seoul (South Korea)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1574376

Journal Information:: Macromolecular Rapid Communications, Journal Name: Macromolecular Rapid Communications Journal Issue: 19 Vol. 40; ISSN 1022-1336

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Small‐Molecule Modulation of Soft‐Matter Frank–Kasper Phases: A Method for Adding Function to Form Lachmayr, Kätchen K.; Sita, Lawrence R. Angewandte Chemie, Vol. 132, Issue 9 https://doi.org/10.1002/ange.201915416	journal	January 2020
Small‐Molecule Modulation of Soft‐Matter Frank–Kasper Phases: A Method for Adding Function to Form Lachmayr, Kätchen K.; Sita, Lawrence R. Angewandte Chemie International Edition, Vol. 59, Issue 9 https://doi.org/10.1002/anie.201915416	journal	January 2020

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quasicrystals
self-assembly

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