Regensburg 2016 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 4: Nanoparticles, Nanocrystals and Composites I

CPP 4.10: Vortrag

Montag, 7. März 2016, 12:00–12:15, H41

Dynamics and interfaces in functional polymer nanocomposites — •Ulrich Scheler — Leibniz-Institut für Polymerforschung Dresden e.V.

Nanoparticles from hydroxyapatite (HAp) and layered double hydroxides (LDH) have been investigated using solid-state NMR. 27Al NMR provides a local probe for the interface of the nanoparticles and the modifications applied to enhance to compatibility with the polymer matrix. The coordination and the local symmetry manifested in the quadrupolar coupling constant is monitored. Dedicated solid-state NMR experiments permit the selective excitation of the protons in the Hap particles. Spin diffusion from there transfers the magnetization to the nearby protons in the polymer matrix. Thus distance-dependent solid-state NMR spectroscopy becomes feasible, allowing the investigation of structure and local mobility of the polymers in contact with the inorganic filler compared to the bulk material, showing reduced polymer segment motion in the vicinity of the the particles. Additional dynamic information is available from EPR using spin-labelled polyelectrolytes in multilayers covering the nanoparticles.