Direct Observation of confined Single Chain Dynamics by Neutron Scattering

Martin, J.; Krutyeva, M.; Monkenbusch, M.; Allgaier, J.; Richter, D.; Maiz, J.; Mijangos, C.; Colmenero, J.; Radulescu, A.; Arbe, A.; Falus, P.

doi:10.1103/PhysRevLett.104.197801

Journal Article

Direct Observation of confined Single Chain Dynamics by Neutron Scattering

Martin, J. ; Krutyeva, M.FZJ* ; Monkenbusch, M.FZJ* ; Arbe, A. ; Allgaier, J.FZJ* ; Radulescu, A.FZJ* ; Falus, P. ; Maiz, J. ; Mijangos, C. ; Colmenero, J. ; Richter, D.FZJ*

2010
APS College Park, Md.

Physical review letters 104, 197801 (2010) [10.1103/PhysRevLett.104.197801]

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Please use a persistent id in citations: http://hdl.handle.net/2128/7237 doi:10.1103/PhysRevLett.104.197801

Abstract: 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.

Keyword(s): J

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Physics, Multidisciplinary

Note: We thank M. Hernandez-Velez, A. R. Gonzalez-Elipe, J. Gil, R. Sastre, O. Garcia, and M. Brodeck, SoftComp NoE, MAT2007-63681, IT-436-07 (GV), the MEyC (CSD2006-53), Grants FPU AP2005-1063 and MAT2008-1073.

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Appears in the scientific report 2010

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