Collective Motion in the Interfacial and Interior Regions of Supported Polymer Films and Its Relation to Relaxation
Wengang Zhang, Francis W. Starr, Jack F. Douglas
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.
, Starr, F.
and Douglas, J.
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)