Journal Article

FZJ-2021-02701

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Mobility of bound water in PNIPAM microgels

Kyrey, T. (Corresponding author)FZJ* ; Witte, J.Extern* ; Lutzki, J. ; Zamponi, M.FZJ* ; Wellert, S.Extern* ; Holderer, O.FZJ*

2021
RSC Publ. Cambridge

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Please use a persistent id in citations: http://hdl.handle.net/2128/28088  doi:10.1039/D1CP01823J

Abstract: Polymer–solvent interactions play a crucial role in the stimuli-responsive behaviour of polymer networks. They influence the swelling/deswelling behaviour as well as the dynamics of the polymer chains. Scattering experiments provide insight into the polymer–water interaction of poly(N-isopropylacrylamide) (PNIPAM) microgels cross-linked with N,N′-methylenebisacrylamide (BIS) in dried and humidified state. The water mobility is studied by means of neutron spin-echo spectroscopy and neutron backscattering spectroscopy. The residual water amount has been determined with Karl Fischer titration. For both degrees of humidification, the relaxation time of the water molecules is much larger than that of free water due to the strong interactions with the polymer network and is only weakly depending on temperature and length scale of observation. The possible influence of the water on methyl group rotations is discussed

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

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Contributing Institute(s):

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

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)
3. DFG project 290879244 - Grenzflächennahe Dynamik nicht quervernetzter und quervernetzter Polymerarchitekturen auf festen planaren Oberflächen (290879244)

Experiment(s):

1. J-NSE: Neutron spin-echo spectrometer (NL2ao)
2. SPHERES: Backscattering spectrometer (NL6S)

Appears in the scientific report 2021

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Database coverage:
; ; ; Allianz-Lizenz / DFG ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF < 5 ; JCR ; National-Konsortium ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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