Berlin 2005 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 29: POSTER: Polymer physics

CPP 29.46: Poster

Dienstag, 8. März 2005, 16:30–18:30, Poster TU D

Dynamic Structure Factor of Constrained Polymer Chains — •Strauch Michael and Straube Ekkehard — University of Halle, Department of Theoretical Physics, D-06099 Halle, GERMANY

The poster presents investigations concerning the analytical calculation and numerical simulation of the dynamic structure factor S_q(t) of polymer chains.

The dynamic structure factor for a network of chains with fixed end-to-end distances is calculated strictly analytically. This calculation was first done for the equilibrium end-to-end distance R. An integration over distributions of end-to-end vectors in the network gives an estimation of the influence of chain localisation on S_q(t). – In agreement with plausible considerations, the dynamic structure factor of the network reaches a finite plateau value rather than zero for long times because the correlations between chain segments do not completely vanish.

Additionally, an extension of a model originally introduced by de Gennes is studied. In the original model, the dynamic behaviour of the chain is calculated as a one-dimensional, longitudinal diffusion along the primitive path being described as a random walk. The effect of including transverse fluctuations is studied.