@article{3012703,
    title = "Phonon propagation in ordered diblock copolymer solutions",
    author = "Tommaseo, G. and Penciu, R.S. and Fytas, G. and Economou, E.N. and Hashimoto, T. and Hadjichristidis, N.",
    journal = "Macromolecules",
    year = "2004",
    volume = "37",
    number = "13",
    pages = "5006-5010",
    issn = "0024-9297, 1520-5835",
    doi = "10.1021/ma0496246",
    keywords = "Annealing;  Block copolymers;  Brillouin scattering;  Dispersions;  Elastic waves;  Light scattering;  Phonons;  Rayleigh scattering;  Refractive index;  Solutions;  Transmission electron microscopy;  Vectors;  X ray scattering, Elastic constants;  Grain orientation;  Microphase morphology;  Sensitive index, Macromolecules",
    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."
}