Direct observation of confined single chain dynamics by neutron scattering

Neutron spin echo has revealed the single chain dynamic structure factor of entangled polymer chains confined in cylindrical nanopores with chain dimensions either much larger or smaller than the lateral pore sizes. In both situations, a slowing down of the dynamics with respect to the bulk behavior...

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Bibliographic Details
Published in:Physical review letters 2010-05, Vol.104 (19), p.197801-197801, Article 197801
Main Authors: Martín, J, Krutyeva, M, Monkenbusch, M, Arbe, A, Allgaier, J, Radulescu, A, Falus, P, Maiz, J, Mijangos, C, Colmenero, J, Richter, D
Format: Article
Language:English
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Summary:Neutron spin echo has revealed the single chain dynamic structure factor of entangled polymer chains confined in cylindrical nanopores with chain dimensions either much larger or smaller than the lateral pore sizes. In both situations, a slowing down of the dynamics with respect to the bulk behavior is only observed at intermediate times. The results at long times provide a direct microscopic measurement of the entanglement distance under confinement. They constitute the first experimental microscopic evidence of the dilution of the total entanglement density in a polymer melt under strong confinement, a phenomenon that so far was hypothesized on the basis of various macroscopic observations.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.104.197801