| Issue |
Europhys. Lett.
Volume 52, Number 6, December II 2000
|
|
|---|---|---|
| Page(s) | 719 - 720 | |
| Section | Interdisciplinary physics and related areas of science and technology | |
| DOI | https://doi.org/10.1209/epl/i2000-00497-y | |
| Published online | 01 September 2002 | |
Comment on "What is the entanglement length in a polymer melt?” by M. Pütz, K. Kremer and G. S. Grest
Institut für Festkörperforschung, Forschungszentrum
Jülich - D-52425 Jülich, Germany
Received:
5
May
2000
Accepted:
17
October
2000
In a recent letter Pütz, Kremer and Grest claim that
finite-chain-length effects have significant influence on the
single-chain dynamic structure factor S(Q,t)/S(Q) measured by
neutron-spin-echo (NSE) technique with regard to results obtained for
a polyethylene (PE) melt with a molecular weight of 
g/mol. As a consequence of these finite-length effects, they
assert the tube diameter, determined by this NSE measurement in the
framework of the reptation model, to be too high by a factor of
≈ 1.5. We demonstrate that this is by no means the case.
PACS: 61.25.Hq – Macromolecular and polymer solutions; polymer melts; swelling / 83.20.Fk – Reptation theories
© EDP Sciences, 2000
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