title: Origin of dynamic heterogeneities in miscible polymer blends: A quasielastic neutron scattering study
abstract: In order to investigate the origin of the often invoked nanoheterogeneities in miscible polymer blends, we have performed quasielastic neutron scattering experiments on the component dynamics within the miscible polymer blend polyisoprene/polyvinyl ether including the pure components as a reference. We find that the apparent local heterogeneities observed by spectroscopic techniques originate from the chain specific crossover properties between entropy driven and local chain dynamics and are, thus, a purely dynamical phenomenon.
authors.affiliation: Institut fur Festkorperforschung, Forschungszentrum Julich, 52425 Julich, Germany and Institut Laue-Langevin, 156X, 38042 Grenoble CEDEX, France.
authors.initials: S
authors.lastname: Hoffmann
authors.initials: L
authors.lastname: Willner
authors.initials: D
authors.lastname: Richter
authors.initials: A
authors.lastname: Arbe
authors.initials: J
authors.lastname: Colmenero
authors.initials: B
authors.lastname: Farago