title: Entanglement effects in capillary waves on liquid polymer films.
abstract: Overdamped surface capillary wave relaxations on molten polymer films were measured using x-ray photon correlation spectroscopy. We found a transition from a single through a stretched to another single exponential regime as the temperature is decreased from well above to near the bulk glass transition temperature. A universal scaling of the dynamics was discovered over a wide range of film thicknesses, temperatures, and molecular weights (except in the multiple relaxation regime). These observations are justified by hydrodynamic theory and the time-temperature superposition principle by considering an effective viscosity instead of the bulk zero shear viscosity.
authors.affiliation: Department of Physics, University of California at San Diego, La Jolla, California 92093, USA.
authors.forename: Zhang
authors.initials: Z
authors.lastname: Jiang
authors.forename: Mrinmay K
authors.initials: MK
authors.lastname: Mukhopadhyay
authors.forename: Sanghoon
authors.initials: S
authors.lastname: Song
authors.forename: Suresh
authors.initials: S
authors.lastname: Narayanan
authors.forename: L B
authors.initials: LB
authors.lastname: Lurio
authors.forename: Hyunjung
authors.initials: H
authors.lastname: Kim
authors.forename: Sunil K
authors.initials: SK
authors.lastname: Sinha