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Conformational Asymmetry and Quasicrystal Approximants in Linear Diblock Copolymers
- Source :
- Physical Review Letters. 118
- Publication Year :
- 2017
- Publisher :
- American Physical Society (APS), 2017.
-
Abstract
- Small angle x-ray scattering experiments on three model low molar mass diblock copolymer systems containing minority polylactide and majority hydrocarbon blocks demonstrate that conformational asymmetry stabilizes the Frank-Kasper $\ensuremath{\sigma}$ phase. Differences in block flexibility compete with space filling at constant density inducing the formation of polyhedral shaped particles that assemble into this low symmetry ordered state with local tetrahedral coordination. These results confirm predictions from self-consistent field theory that establish the origins of symmetry breaking in the ordering of block polymer melts subjected to compositional and conformational asymmetry.
- Subjects :
- Materials science
Molar mass
Condensed matter physics
Scattering
media_common.quotation_subject
General Physics and Astronomy
Quasicrystal
02 engineering and technology
Frank Kasper phases
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
Asymmetry
0104 chemical sciences
Chemical physics
Phase (matter)
Tetrahedron
Symmetry breaking
0210 nano-technology
media_common
Subjects
Details
- ISSN :
- 10797114 and 00319007
- Volume :
- 118
- Database :
- OpenAIRE
- Journal :
- Physical Review Letters
- Accession number :
- edsair.doi.dedup.....5381b22ff59ef8b62ef3f18993ddadfa