Berlin 2005 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 30: POSTER: Chemical physics
CPP 30.58: Poster
Dienstag, 8. März 2005, 16:30–18:30, Poster TU D
Dynamical relaxation of copolymeric structures — •Cristian Satmarel1, Alexander Blumen1, Andrei Gurtovenko2,3, and Christian von Ferber1 — 1Theoretische Polymerphysik, Universitaet Freiburg, Hermann-Herder-Str. 3, 79108 - Freiburg, Germany — 2Institute of Macromolecular Compounds, Russian Academy of Sciences, Bolshoi Prospect 31, V.O., St. Petersburg, 199004, Russia — 3Laboratory of Physics and Helsinki Institute of Physics, Helsinki University of Technology, P.O. Box 1100, FIN-02015 HUT, Finland
We treat the dynamics of copolymeric structures with heterogeneity in the mobility of the beads using the Rouse model. The structures that we treat are alternating copolymer chains and regular lattice networks built from these, dendrimers with alternating generations, as well as branched polymers synthesized by end-linking star-like units. We show the effects of alternating mobility of the beads. These effects are well seen in the mechanical relaxation quantities, such as the storage and the loss moduli. The dynamics of the end-linked star polymer structures combines the relaxation of the star arms (spacer chains) and the branching units. We analytically separate these two processes and map the eigenmode spectrum of a homogeneous system to that of a system with spacers. When the spectrum of the homogeneous system is known analytically, this allows for a full analytic solution. We discuss also the important effects connected to the length and mobility of the spacers. [Refs: C. Satmarel, A.A. Gurtovenko, A. Blumen, Macromolecules, (2003), vol.36, 486; Macromol. Theory Simul., (2004), vol.13, 487.]