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Collective Motion in the Interfacial and Interior Regions of Supported Polymer Films and Its Relation to Relaxation

Published

Author(s)

Wengang Zhang, Francis W. Starr, Jack F. Douglas

Abstract

We investigate the extent of collective motion in the interfacial regions of a thin supported polymer film and within the film interior by molecular dynamics simulations to understand the role of collective motion in the often large changes in interfacial molecular mobility observed in polymer films. Contrary to commonly stated expectations, we find that the extent of collective motion determining the temperature dependence of the structural relaxation time does not vary significantly within the film, a finding consistent with Adam-Gibbs proposal that the extent of collective motion in glass-formingliquidsisrelatedtotheconfigurationalentropy, a thermodynamic property that cannot vary with position within the film.
Citation
Journal of Physical Chemistry B

Keywords

thin polymer films, interfacial dynamics, collective motion, strings, Adam-Gibbs theory, glass-formation

Citation

Zhang, W. , Starr, F. and Douglas, J. (2019), Collective Motion in the Interfacial and Interior Regions of Supported Polymer Films and Its Relation to Relaxation, Journal of Physical Chemistry B (Accessed February 28, 2024)
Created June 13, 2019, Updated April 24, 2020