Conformational Asymmetry and Quasicrystal Approximants in Linear Diblock Copolymers

Morgan W. Schulze; Ronald M. Lewis; James H. Lettow; Robert J. Hickey; Timothy M. Gillard; Marc A. Hillmyer; Frank S. Bates

doi:10.1103/PhysRevLett.118.207801

Conformational Asymmetry and Quasicrystal Approximants in Linear Diblock Copolymers

Morgan W. Schulze, Ronald M. Lewis, James H. Lettow, Robert J. Hickey, Timothy M. Gillard, Marc A. Hillmyer, Frank S. Bates

Research output: Contribution to journal › Article › peer-review

52 Scopus citations

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 σ 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.

Original language	English (US)
Article number	207801
Journal	Physical review letters
Volume	118
Issue number	20
DOIs	https://doi.org/10.1103/PhysRevLett.118.207801
State	Published - May 16 2017

Bibliographical note

Funding Information:
The Dow Chemical Company and Northwestern University. Use of the APS, an Office of Science User Facility operated for the U.S. Department of Energy (DOE) Office of Science by Argonne National Laboratory, was supported by the U.S. DOE under Contract No.DE-AC02-06CH11357. Data were collected using an instrument funded by the National Science Foundation under Grant No.0960140.

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© 2017 American Physical Society.

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MRSEC IRG-3: Hierarchical Multifunctional Macromolecular Materials
Reineke, T. M., Bates, F. S., Dorfman, K., Dutcher, C. S., Hillmyer, M. A., Lodge, T., Morse, D. C., Siepmann, I., Barreda, L. & Ganewatta, M. S.
1/1/98 → …
Project: Research project
University of Minnesota MRSEC (DMR-1420013)
Lodge, T.
11/1/14 → 10/31/20
Project: Research project

Cite this

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title = "Conformational Asymmetry and Quasicrystal Approximants in Linear Diblock Copolymers",

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 σ 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.",

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AU - Bates, Frank S.

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Conformational Asymmetry and Quasicrystal Approximants in Linear Diblock Copolymers

Abstract

Bibliographical note

How much support was provided by MRSEC?

Reporting period for MRSEC

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MRSEC IRG-3: Hierarchical Multifunctional Macromolecular Materials

University of Minnesota MRSEC (DMR-1420013)

Cite this