Dresden 2017 – wissenschaftliches Programm
CPP 49.8: Poster
Mittwoch, 22. März 2017, 18:30–21:00, P2-OG1
Local dynamics in macromolecules at the interface to inorganic fillers — Jana Schaber1, Franck Fayon2, and •Ulrich Scheler1 — 1Leibniz-Institut für Polymerforschung Dresden e.V. — 2CEMHTI CNRS Orleans
Dynamic NMR is well suited for the investigation of polymer chain dynamics. However NMR experiments are usually bulk measurements which yield an ensemble average. Two approaches are demonstrated for the selective excitation of protons from the polymer in the vicinity of the filler. A combination of T2 filter and chemical shift selection permits the selective excitation of the OH protons Hydroxyapatite nanoparticles. A second approach is based on heteronuclear magnetization transfer from the filler (29Si enriched silica) to the protons of the surrounding polymer. Subsequent spin diffusion transfers the magnetization further to the protons in the polymer matrix. A combination with relaxation experiments gives the relaxation time as a function of the distance to the filler particle. In the direct vicinity to the interface a shirt T2 indicative of restricted motion has been found. The combination with chemical shift resolution allows to attribute the observed relaxation times to functional groups or the water contained in the biomimetic nanoparticles.