Abstract
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 language | English |
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Article number | 1900259 |
Journal | Macromolecular Rapid Communications |
Volume | 40 |
Issue number | 19 |
DOIs | |
Publication status | Published - 2019 Oct 1 |
Bibliographical note
Funding Information:S.J. and T.J. contributed equally to this work. This research was supported by the Samsung Research Funding Center of Samsung Electronics under the Project Number SRFC-MA1801-04.
Publisher Copyright:
© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Keywords
- Frank–Kasper phases
- block copolymers
- conformational asymmetry
- quasicrystals
- self-assembly
ASJC Scopus subject areas
- Polymers and Plastics
- Organic Chemistry
- Materials Chemistry