Phonon propagation in ordered diblock copolymer solutions

G. Tommaseo, R. S. Penciu, G. Fytas*, E. N. Economou, T. Hashimoto, Nikolaos Hadjichristidis

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

High-resolution inelastic light scattering was employed to measure the dispersion relations for the acoustic excitations in ordered concentrated solutions of poly(styrene)-block-poly(isoprene) copolymers with both symmetric and asymmetric composition and large spacing (220-415 nm). The morphology is manifested in the rich phonon spectrum recorded for different scattering wave vectors q in the range 0.003-0.034 nm-1. The experimental ωa,(q) of the sth branch is directly compared with the theoretical dispersion from band structure calculations performed for different directions of q in the reciprocal lattice of lamellar and cylindrical periodic structures. The dispersion relations turn out to be a sensitive index of the microphase morphology and the grain orientation.

Original languageEnglish (US)
Pages (from-to)5006-5010
Number of pages5
JournalMacromolecules
Volume37
Issue number13
DOIs
StatePublished - Jun 29 2004

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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