Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Solid-like rheological response of non-entangled polymers in the molten
  state   We show that non-entangled polymers display an elastic-like behaviour at a
macroscopic scale (probed at some 0.100 mm thickness) up to at least hundred
degrees above the glass transition temperature. This observation, found under
non-slippage conditions, both for side-chain liquid crystalline polymers and
ordinary polymers, is in contradiction with the typically found flow behaviour
of polymer melt. Our measurements were carried out with a conventional
rheometer at thicknesses of several tenths millimetres. Thus, we were probing
bulk properties. The observed elasticity supposedly implies that even in the
melt the chains experience a cohesive effect of macroscopic distances,
involving collective motions over time scales longer than the individual
relaxation time of an individual polymer chain. The detection of such a
solid-like property of molten non-entangled polymers is of considerable
importance for a better understanding of the polymer dynamics.

30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga