TY  - JOUR
AU  - Kruteva, Margarita
AU  - Zamponi, Michaela
AU  - Hoffmann, Ingo
AU  - Allgaier, Jürgen
AU  - Monkenbusch, Michael
AU  - Richter, Dieter
TI  - Non-Gaussian and Cooperative Dynamics of Entanglement Strands in Polymer Melts
JO  - Macromolecules
VL  - 54
IS  - 24
SN  - 0024-9297
CY  - Washington, DC
PB  - Soc.
M1  - FZJ-2022-00025
SP  - 11384 - 11391
PY  - 2021
AB  - A study on tracer diffusion of short poly(ethylene oxide) (PEO) in a strongly entangled PEO melt by neutron spin echo spectroscopy (NSE) is presented. It has been found that within the entanglement volume, the dynamics of the entanglement strands is significantly Non-Gaussian. Following theoretical predictions the Non-Gaussian correction were quantified in terms of a logarithmic Gaussian function with a maximum at a time in the order of the Rouse times of the different tracers and a width that is independent of the tracer’s length. The strength of the Non-Gaussian correction is found to be equal for all tracers providing another proof that the tracers mirror the host dynamics, which needs to be independent of the tracer length. independent of their molecular weight, the tracer’s center-of-mass mean square displacements are sub-diffusive at short times until they have reached the size of the reptation tube d. We this it has been shown that the host dynamics within the tube is not only cooperative but also significantly Non-Gaussian.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000755658700018
DO  - DOI:10.1021/acs.macromol.1c01859
UR  - https://juser.fz-juelich.de/record/904676
ER  -