Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Glass transitions of freely suspended polymer films   We present a modified version of our "sliding model", where chain arcs,
between two contacts at the surface, may move if all the barriers along the arc
are weaker than a certain threshold.An important advance of the revised model
is that the high limiting chain lengths N* observed in the experiments are
naturally accoundted for. In this model, a film of thickness h, smaller than
the coil size, can show either a "sandwich" structure with two mobile sublayers
(at low temperatures T<T(h)), or a single mobile layer at T>T(h). But the
accident occurring at T=T(h), does not necessarily coincide with the apparent
glass transition, determined by the intersection of two tangents in a plot of
thickness versus temperature.

29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
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The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat
2
The categories of this paper are: math
3
The categories of this paper are: physics
0
The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th