This title appears in the Scientific Report :
2022
Please use the identifier:
http://hdl.handle.net/2128/30779 in citations.
Please use the identifier: http://dx.doi.org/10.1021/acs.macromol.1c01859 in citations.
Non-Gaussian and Cooperative Dynamics of Entanglement Strands in Polymer Melts
Non-Gaussian and Cooperative Dynamics of Entanglement Strands in Polymer Melts
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...
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Personal Name(s): | Kruteva, Margarita (Corresponding author) |
---|---|
Zamponi, Michaela / Hoffmann, Ingo / Allgaier, Jürgen / Monkenbusch, Michael / Richter, Dieter | |
Contributing Institute: |
Streumethoden; JCNS-2 JCNS-4; JCNS-4 JCNS-FRM-II; JCNS-FRM-II Heinz Maier-Leibnitz Zentrum; MLZ Neutronenstreuung; JCNS-1 |
Published in: | Macromolecules, 54 (2021) 24, S. 11384 - 11391 |
Imprint: |
Washington, DC
Soc.
2021
|
DOI: |
10.1021/acs.macromol.1c01859 |
Document Type: |
Journal Article |
Research Program: |
Materials – Quantum, Complex and Functional Materials Jülich Centre for Neutron Research (JCNS) (FZJ) |
Subject (ZB): | |
Link: |
Published on 2021-12-15. Available in OpenAccess from 2022-12-15. Restricted |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1021/acs.macromol.1c01859 in citations.
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. |