Entanglement effects in capillary waves on liquid polymer films.
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.
Jiang
Zhang
Z
Department of Physics, University of California at San Diego, La Jolla, California 92093, USA.
Mukhopadhyay
Mrinmay K
MK
Song
Sanghoon
S
Narayanan
Suresh
S
Lurio
L B
LB
Kim
Hyunjung
H
Sinha
Sunil K
SK