Berlin 2012 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 23: Poster: Polymer Dynamics
CPP 23.9: Poster
Mittwoch, 28. März 2012, 11:00–13:00, Poster A
Structure and Dynamics of Polyethylene Glycol Polymer Rings — •Sebastian Gooßen1, Ana Rita Brás1, Wim Pyckhout-Hintzen1, Andreas Wischnewski1, O. Holderer2, A. Radulescu2, B. Farago3, M. Krutyeva1, Jürgen Allgaier1, and Dieter Richter1 — 1Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science JCNS (JCNS-1) & Institute for Complex Systems (ICS), 52425 Jülich, Germany — 2Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science, Outstation at FRM II, 85747 Garching, Germany — 3Institut Laue-Langevin, 38042 Grenoble, France
The structural analysis of highly pure polyethylene glycol (PEG) polymer rings in a theta solvent with SAXS and with SANS in the melt showed a significantly more compact structure for the ring polymers compared to their linear equivalents of same molecular weight. The dynamical behavior of ring polymers and linear chains was studied in the melt by NSE spectroscopy. In comparison the ring polymers showed a significantly faster center of mass diffusion than the linear chains. This turns out to be an explicit violation of the Rouse model. Furthermore blends of ring polymers in a matrix of linear polymer chains were investigated with these techniques. For PEG ring polymers with a molecular weight above the entanglement molecular weight Me the observed center-of-mass diffusion in the linear matrix is surprisingly low compared to PEG polymer rings below Me. This leads to the question if, due to the interpenetration of ring polymers and linear polymer chains, collective diffusion occurs in these blends.