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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 8: Responsive and Adaptive Systems
CPP 8.3: Vortrag
Montag, 27. März 2023, 11:30–11:45, ZEU 255
Hydration Water Dynamics in a Thermoresponsive Polymer Solution Under Pressure — Bart-Jan Niebuur1, Bahar Yazdanshenas1, Feifei Zheng1, Wiebke Lohstroh2, Marcell Wolf2, Marie-Sousai Appavou3, Michaela Zamponi3, Alfons Schulte4, and •Christine M. Papadakis1 — 1Technical University of Munich, TUM School of Natural Sciences, Garching, Germany — 2Technical University of Munich, Heinz Maier-Leibnitz Zentrum (MLZ), Garching, Germany — 3Jülich Centre for Neutron Science (JCNS) at MLZ, Garching, Germany — 4University of Central Florida, Department of Physics, Orlando FL, U.S.A.
The water dynamics is key to functionality and phase behavior of synthetic and biological polymers. We investigate the dynamic behavior of hydration water in a concentrated aqueous solution of the thermoresponsive polymer poly(N-isopropyl acrylamide) (PNIPAM) in dependence on temperature and pressure employing quasi-elastic neutron scattering (QENS) [1]. The susceptibility spectra reveal the relaxation peak of the hydration water in addition to the known dynamic processes of bulk water. We find that the dehydration process at the phase transition depends strongly on pressure. Using perdeuterated PNIPAM along with QENS allows us to suppress the signal of the chain segments and to identify and characterize the behavior of the different types of bound water at the phase transition.
1. B.-J. Niebuur, W. Lohstroh, M.-S. Appavou, A. Schulte, C. M. Papadakis, Macromolecules 2019, 52, 1942.