Berlin 2005 – scientific programme

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CPP: Chemische Physik und Polymerphysik

CPP 29: POSTER: Polymer physics

CPP 29.47: Poster

Tuesday, March 8, 2005, 16:30–18:30, Poster TU D

Hydrodynamic effects: polymers modelled by small world networks — •Mircea Galiceanu and Alexander Blumen — Theoretische Polymerphysik, Universität Freiburg, Hermann-Herder-Str. 3, D-79104 Freiburg, Germany

We investigate on polymers in the form of small world networks (SWN) the influence of hydrodynamic effects using the Zimm model, with a preaveraged Oseen tensor. The monomers (beads) are connected by harmonic springs and they are subjected to external fields. A SWN realization starts from a N-monomer ring, whose pairs of beads are randomly connected, with probability p, by additional links. Varying p from 0 to 0.5 we consider the averaged mean square displacement of the polymers, the storage and the loss moduli, G′(ω) and G″(ω).

In the Zimm model, as in the Rouse model [1], changes in structure are evident in an intermediate (time or frequency) domain; even very small but nonvanishing p lead to changes from the p=0 case. Furthermore, the long time domain is reached earlier by structures with more crosslinks (higher p).

[1] S. Jespersen, I. Sokolov and A. Blumen, J.Chem.Phys. 113, 7652, (2000).