%0 Journal Article
%A Brás, Ana Rita Elias
%A Goossen, Sebastian
%A Krutyeva, Margarita
%A Radulescu, Aurel
%A Farago, Bela
%A Allgaier, J.
%A Pyckhout-Hintzen, Wim
%A Wischnewski, Andreas
%A Richter, Dieter
%T Compact structure and non-Gaussian Dynamics of ring polymer melts
%J Soft matter
%V 10
%N 20
%@ 1744-6848
%C Cambridge
%I Royal Society of Chemistry (RSC)
%M FZJ-2014-01674
%P 3649-3655
%D 2014
%X 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
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000335927400013
%R 10.1039/c3sm52717d
%U https://juser.fz-juelich.de/record/151795