Regensburg 2013 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 33: Poster: Charged Soft Matter

CPP 33.15: Poster

Mittwoch, 13. März 2013, 16:30–18:30, Poster C

Charge and Mobility of Polyelectrolyte Complex Nanoparticles — Karsten Gelfert, Uwe Lappan, Simona Schwarz, and •Ulrich Scheler — Leibniz-Institut für Polymerforschung Dresden e.V.

Polyelectrolyte Complex nanoparticles formed from poly(maleicanhydride-coethylene) and poly(diallyldimethylamonium chloride) have been studied by a combination of NMR, EPR and light scattering under variation of the overall composition of the complexes. Dynamic light scattering and PFG NMR yield complementary information on the hydrodynamic size, where PFG NMR is more sensitive to primary complexes and DLS to the nanoparticles. The importance of primary particles for the total stability of the system has been shown. Electrophoresis NMR permits the measurement of the effective charge of both the primary complexes and nanoparticles. In conjunction with the NMR spectroscopic on the chemical species involved, free polyelectrolytes are excluded all excess material is contained in primary complexes. Selective placements of spin labels on the polyanion permits the investigation of molecular dynamics by EPR lineshape analysis showing strong hinderance of teh local mobility in the minority component.