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2002:
Wischnewski A; Monkenbusch M; Willner L; Richter D; Likhtman A E; McLeish T C B; Farago B
Molecular observation of contour-length fluctuations limiting topological confinement in polymer melts.
Physical review letters 2002;
88(
5):.
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.
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