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CPP: Chemische Physik und Polymerphysik
CPP 9: Blockcopolymere, Blends und Kompositmaterialien
CPP 9.2: Vortrag
Dienstag, 12. März 2002, 13:50–14:10, H38
Diffusion in a ternary polymer blend in the bicontinuous microemulsion phase — •Stefan Gröger1, Frank Rittig1,2, Frank Stallmach1, Jörg Kärger1, Kristoffer Almdal3, Petr Štěpánek4, and Christine M. Papadakis1 — 1Department of Physics and Earth Sciences, University of Leipzig, Leipzig, Germany — 2Air Products and Chemicals, Inc., Allentown, PA, USA — 3Condensed Matter Physics and Chemistry Department, Risø National Laboratory, Roskilde, Denmark — 4Institute of Macromolecular Chemistry, Prague, Czech Republic
Ternary polymer blends form a variety of mesoscopically structured phases and can serve as a model system to study the influence of structure on dynamics.
Our system consists of poly(dimethylsiloxane) (PDMS) and poly(ethylethylene) (PEE) homopolymers and symmetric PEE-PDMS diblock copolymers. We have applied pulsed field gradient NMR to investigate the diffusional behavior of this ternary polymer blend in the bicontinuous microemulsion phase. Two processes were identified which are due to the diffusion of the PDMS and PEE homopolymers. The changes in the diffusional behavior with respect to the bulk state are discussed in the context of the tortuosity of the structure and exchange of the homopolymers between the PEE and the PDMS domains.