TY  - JOUR
AU  - Brás, Ana Rita Elias
AU  - Goossen, Sebastian
AU  - Krutyeva, Margarita
AU  - Radulescu, Aurel
AU  - Farago, Bela
AU  - Allgaier, J.
AU  - Pyckhout-Hintzen, Wim
AU  - Wischnewski, Andreas
AU  - Richter, Dieter
TI  - Compact structure and non-Gaussian Dynamics of ring polymer melts
JO  - Soft matter
VL  - 10
IS  - 20
SN  - 1744-6848
CY  - Cambridge
PB  - Royal Society of Chemistry (RSC)
M1  - FZJ-2014-01674
SP  - 3649-3655
PY  - 2014
AB  - 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
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000335927400013
DO  - DOI:10.1039/c3sm52717d
UR  - https://juser.fz-juelich.de/record/151795
ER  -