Dresden 2009 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 42: Polymer Physics IV
CPP 42.9: Talk
Friday, March 27, 2009, 12:30–12:45, ZEU 160
Static and Dynamic Properties of Hyperbranched Polymers Modelled by Generalized Vicsek Fractals — •Tobias Pardowitz1, Martin Oliver Steinhauser2, and Alexander Blumen1 — 1University of Freiburg, Freiburg, Germany — 2Fraunhofer Ernst-Mach-Institut for High-Speed Dynamics, Freiburg, Germany
We study the properties of hyperbranched polymers modelled by generalised Vicsek fractals (GVF) in dilute solution. Due to their fractal (self similar) structure one expects the static as well as the dynamic properties to exhibit typical power law behaviour. Both equilibrium as well as non-equilibrium Brownian dynamics simulations of dilute GVF polymer solutions are performed. Of special interest in both cases is the influence of the excluded volume (EV).
We find the static scaling in good solvent to differ significantly from previous results obtained by a generalised Flory argument. Thus we put forward a different expression for fractal polymers which enables us to explain the simulation data as well as recent experimental observations.
Studying non-equilibrium situations such as micromanipulations and polymers under shear we obtain results in very good agreement with predictions made in the generalised Gaussian structure (GGS) framework. We are furthermore able to establish the influence of the EV on dynamical quantities, effects which are beyond the range of the GGS approach.