This title appears in the Scientific Report :
2021
Please use the identifier:
http://dx.doi.org/10.1039/D1CP01823J in citations.
Please use the identifier: http://hdl.handle.net/2128/28088 in citations.
Mobility of bound water in PNIPAM microgels
Mobility of bound water in PNIPAM microgels
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-isopropylacryl...
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Personal Name(s): | Kyrey, Tetyana (Corresponding author) |
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Witte, Judith / Lutzki, Jana / Zamponi, Michaela / Wellert, Stefan / Holderer, Olaf | |
Contributing Institute: |
JCNS-FRM-II; JCNS-FRM-II Neutronenstreuung; JCNS-1 JCNS-4; JCNS-4 Heinz Maier-Leibnitz Zentrum; MLZ |
Published in: | Physical chemistry, chemical physics, 23 (2021) S. 14252-14259 |
Imprint: |
Cambridge
RSC Publ.
2021
|
DOI: |
10.1039/D1CP01823J |
Document Type: |
Journal Article |
Research Program: |
Grenzflächennahe Dynamik nicht quervernetzter und quervernetzter Polymerarchitekturen auf festen planaren Oberflächen Materials – Quantum, Complex and Functional Materials Jülich Centre for Neutron Research (JCNS) (FZJ) |
Subject (ZB): | |
Link: |
OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/28088 in citations.
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 |