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Molecular observation of contour-length fluctuations limiting topological confinement in polymer melts

Wischnewski, A., Monkenbusch, M., Willner, L., Richter, D., Likhtman, A.E., McLeish, T.C.B. and Farago, B. (2002) Molecular observation of contour-length fluctuations limiting topological confinement in polymer melts. Physical Review Letters, 88 (5). Art. No. 058301. ISSN 0031-9007

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Abstract

In order to study the mechanisms limiting the topological chain confinement in polymer melts, we have performed neutron-spin-echo investigations of the single-chain dynamic-structure factor from polyethylene melts over a large range of chain lengths. While at high molecular weight the reptation model is corroborated, a systematic loosening of the confinement with decreasing chain length is found. The dynamic-structure factors are quantitatively described by the effect of contour-length fluctuations on the confining tube, establishing this mechanism on a molecular level in space and time.

Item Type: Article
Copyright, Publisher and Additional Information: © 2002 The American Physical Society. Reproduced in accordance with the publisher's self-archiving policy.
Institution: The University of Leeds
Academic Units: The University of Leeds > Faculty of Maths and Physical Sciences (Leeds) > School of Physics and Astronomy (Leeds)
The University of Leeds > University of Leeds Research Centres and Institutes > Interdisciplinary Research Centre in Polymer Science and Technology (Leeds)
Depositing User: Repository Officer
Date Deposited: 17 Aug 2006
Last Modified: 06 Jun 2014 09:24
Published Version: http://link.aps.org/abstract/PRL/v88/e058301
Status: Published
Publisher: American Physical Society
Refereed: Yes
Identification Number: 10.1103/PhysRevLett.88.058301
URI: http://eprints.whiterose.ac.uk/id/eprint/1507

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