Journal Article

FZJ-2022-00025

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Non-Gaussian and Cooperative Dynamics of Entanglement Strands in Polymer Melts

Kruteva, M. (Corresponding author)FZJ* ; Zamponi, M.MLZ*FZJ* ; Hoffmann, I.Extern* ; Allgaier, J.FZJ* ; Monkenbusch, M.FZJ* ; Richter, D.FZJ*

2021
Soc. Washington, DC

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Please use a persistent id in citations: http://hdl.handle.net/2128/30779  doi:10.1021/acs.macromol.1c01859

Abstract: 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.

Keyword(s): Polymers, Soft Nano Particles and Proteins (1st) ; Soft Condensed Matter (2nd)

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Contributing Institute(s):

1. Neutronenstreuung (JCNS-1)
2. Heinz Maier-Leibnitz Zentrum (MLZ)
3. JCNS-FRM-II (JCNS-FRM-II)
4. JCNS-4 (JCNS-4)
5. Streumethoden (JCNS-2)

Research Program(s):

1. 6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ) (POF4-6G4) (POF4-6G4)
2. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)

Experiment(s):

1. Measurement at external facility

Appears in the scientific report 2022

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Database coverage:
; ; Chemical Reactions ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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