Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Unifying Framework to Quantify the Effects of Substrate Interactions,
  Stiffness, and Roughness on the Dynamics of Thin Supported Polymer Films   Changes in the dynamics of supported polymer films in comparison to bulk
materials involve a complex convolution of effects, such as substrate
interactions, roughness and compliance, in addition to film thickness. We
consider molecular dynamics simulations of substrate-supported, coarse-grained
polymer films where these parameters are tuned separately to determine how each
of these variables influence the molecular dynamics of thin polymer films. We
find that all these variables significantly influence the film dynamics,
leading to a seemingly intractable degree of complexity in describing these
changes. However, by considering how these constraining variables influence
string-like collective motion within the film, we show that all our
observations can be understood in a unified and quantitative way. More
specifically, the string model for glass-forming liquids implies that the
changes in the structural relaxation of these films are governed by the changes
in the average length of string-like cooperative motions and this model is
confirmed under all conditions considered in our simulations. Ultimately, these
changes are parameterized in terms of just the activation enthalpy and entropy
for molecular organization, which have predictable dependences on substrate
properties and film thickness, offering a promising approach for the rational
design of film properties.

9
The categories of this paper are: nlin
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
30
The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex
19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th