Compact structure and non-Gaussian Dynamics of ring polymer melts

Brás, Ana Rita Elias; Pyckhout-Hintzen, Wim; Richter, Dieter; Radulescu, Aurel; Krutyeva, Margarita; Farago, Bela; Wischnewski, Andreas; Goossen, Sebastian; Allgaier, J.

doi:10.1039/c3sm52717d

Journal Article

FZJ-2014-01674

Compact structure and non-Gaussian Dynamics of ring polymer melts

Brás, A. R. E. (Corresponding author) ; Goossen, S.FZJ* ; Krutyeva, M.FZJ* ; Radulescu, A.FZJ* ; Farago, B. ; Allgaier, J.FZJ* ; Pyckhout-Hintzen, W.FZJ* ; Wischnewski, A.FZJ* ; Richter, D.FZJ*

2014
Royal Society of Chemistry (RSC) Cambridge

Soft matter 10(20), 3649-3655 (2014) [10.1039/c3sm52717d]

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Please use a persistent id in citations: http://hdl.handle.net/2128/22892 doi:10.1039/c3sm52717d

Abstract: We present a neutron scattering analysis of the structure and dynamics of PEO polymer rings with a molecular weight 2.5 times higher than the entanglement mass. The melt structure was found to be more compact than a Gaussian model would suggest. With increasing time the center of mass (c.o.m.) diffusion undergoes a transition from sub-diffusive to diffusive behavior. The transition time agrees well with the decorrelation time predicted by a mode coupling approach. As a novel feature well pronounced non-Gaussian behavior of the c.o.m. diffusion was found that shows surprising analogies to the cage effect known from glassy systems. Finally, the longest wavelength Rouse modes are suppressed possibly as a consequence of an onset of lattice animal features as hypothesized in theoretical approaches

Keyword(s): Basic research (1st) ; Key Technologies (1st) ; Others (1st) ; Soft Matter, Macromolecules, Complex fluids, Biophysics (1st) ; Soft Condensed Matter (2nd)