Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the Dynamics and Disentanglement in Thin and Two-Dimensional Polymer
  Films   We present results from molecular dynamics simulations of strictly
two-dimensional (2D) polymer melts and thin polymer films in a slit geometry of
thickness of the order of the radius of gyration. We find that the dynamics of
the 2D melt is qualitatively different from that of the films. The 2D monomer
mean-square displacement shows a $t^{8/15}$ power law at intermediate times
instead of the $t^{1/2}$ law expected from Rouse theory for nonentangled
chains. In films of finite thickness, chain entanglements may occur. The impact
of confinement on the entanglement length $N_\mathrm{e}$ has been analyzed by a
primitive path analysis. The analysis reveals that $N_\mathrm{e}$ increases
strongly with decreasing film thickness.

18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
2
The categories of this paper are: math
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
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The categories of this paper are: solv-int
3
The categories of this paper are: physics