Regensburg 2016 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 25: Focus: Functional Polymer Hybrids II
CPP 25.5: Vortrag
Dienstag, 8. März 2016, 15:30–15:45, H51
structure and dynamics of nanocomposite hydrogels based on HEUR polymers and coated magnetite nanoparticles. — •Antonella Campanella1, Olaf Holderer1, Konstantinos Raftopoulos2, Peter Müller-Buschbaum2, and Henrich Frielinghaus1 — 1JCNS@FRMII, Lichtenbergstrasse 1, 85747 Garching, Germany — 2Technische Universität München, Physik-Department, LS Funktionelle Materialien, James-Franck-Strasse 1, 85748 Garching, Germany
Magnetic nanoparticles as component in the nanocomposite hydrogel formulation lead to a wide variety of applications, e.g. cancer treatment, separation devices, electromagnetic waves absorbers. The structure and the dynamics of nanocomposite hydrogels based on HEUR (hydrophobically modified ethoxylated urethanes) polymers and coated magnetite magnetite nanoparticles are investigated with small angle neutron scattering (SANS) and with dielectric relaxation spectroscopy (DRS) in combination with neutron spin echo (NSE), respectively. The embedding of the magnetite nanoparticles in the HEUR polymer network leads to i) an increase of the domain spacing of the polymer network, i.e. the distance between the hydrophobic domains composed of the alkyl ends of the HEUR polymer and ii) a partial suppression of the segmental motion of the middle polar block of the HEUR polymer.