title: Dynamic heterogeneity in fully miscible blends of polystyrene with oligostyrene.
abstract: Binary blends of polystyrene with oligostyrene are perfectly miscible (χ=0) yet dynamically heterogeneous. This is evidenced by independent probing of the dipole relaxation perpendicular to the backbone by dielectric spectroscopy and molecular dynamics. The self-concentration model with a single intramolecular length scale qualitatively describes the slower segmental dynamics. A quantitative comparison based on MD, however, requires a composition-dependent length scale. The pertinent dynamic length scale that best describes the slow segmental dynamics in miscible blends relates to both intra- and intermolecular contributions.
authors.affiliation: Department of Applied Mathematics, University of Crete, and IACM FORTH GR-71110 Heraklion, Greece. vagelis@tem.uoc.gr
authors.forename: Vagelis A
authors.initials: VA
authors.lastname: Harmandaris
authors.forename: Kurt
authors.initials: K
authors.lastname: Kremer
authors.forename: George
authors.initials: G
authors.lastname: Floudas