Structure and Dynamics of Polymer Rings by Neutron Scattering: Breakdown of the Rouse Model

Bras, A.R.; Wischnewski, A.; Pasquino, R.; Vlassopoulos, D.; Holderer, O.; Koukoulas, T.; Radulescu, A.; Mavrantzas, V.; Allgaier, J.; Pykchout-Hintzen, W.; Tsolou, G.

doi:10.1039/c1sm06257c

Journal Article

Structure and Dynamics of Polymer Rings by Neutron Scattering: Breakdown of the Rouse Model

Bras, A. R. ; Pasquino, R. ; Koukoulas, T. ; Tsolou, G. ; Holderer, O.FZJ* ; Radulescu, A.FZJ* ; Allgaier, J.FZJ* ; Mavrantzas, V. ; Pykchout-Hintzen, W.FZJ* ; Wischnewski, A.FZJ* ; Vlassopoulos, D.

2011
Royal Society of Chemistry (RSC) Cambridge

Soft matter 7, 11169 - 11176 (2011) [10.1039/c1sm06257c]

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Please use a persistent id in citations: http://hdl.handle.net/2128/7339 doi:10.1039/C1SM06257C

Abstract: We present a static and quasi-elastic neutron scattering study on both the structure and dynamics of a ring polymer in a ring and linear polymer melt, respectively. In the first case, the ring structure proved to be significantly more compact compared to the linear chain with the same molecular weight. In the mixture, the ring molecules swell as was confirmed by small angle neutron scattering ( SANS) in accordance with both theory and simulation work. The dynamical behavior of both systems, which for the first time has been explored by neutron spin echo spectroscopy (NSE), shows a surprisingly fast center of mass diffusion as compared to the linear polymer. These results agree qualitatively with the presented atomistic MD simulations. The fast diffusion turned out to be an explicit violation of the Rouse model.

Keyword(s): Basic research (1st) ; Others (1st) ; Soft Condensed Matter (2nd) ; J

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Note: The authors thank T. Chang (Pohang University of Science and Technology, South Korea) for the LCCC analysis. The authors acknowledge EU for funding through the ITN-214627 (DYNACOP). ARB and RP acknowledge DYNACOP for a post-doc grant.

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Appears in the scientific report 2011
Notes: First published on the web 13 Oct 2011

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