Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 37: Poster Session 2
CPP 37.2: Poster
Mittwoch, 2. April 2014, 15:00–19:00, P3
Different Polymer Architectures under External Oscillatory Forces — •Ron Dockhorn1,2, Tom Gießgen1,2, and Jens-Uwe Sommer1,2 — 1Leibniz-Institut für Polymerforschung Dresden e.V., D-01069 Dresden, Germany — 2Technische Universität Dresden, Institut für Theoretische Physik, D-01069 Dresden, Germany
We are studying the force-extension behavior of different polymer architectures (linear chains, ring polymer, 31-trefoil knot, two connected or concatenate rings) by using the bond-fluctuation simulation method. First, we apply a constant force f0 on the chain ends and determine the response of the end-to-end-distance R. The simulation results for the linear and ring structures follow the scaling prediction of the linear ∼ f0 and Pincus-regime ∼ f02/3, but the connected/concatenate rings show small deviations. Second, we apply an oscillatory force f= f0 + fa · sin(ω t) acting on the chain ends and investigate the response of the end-to-end-distance R on the oscillatory frequency ω. An analytical expression for the end-to-end-distance R(f) is derived by using the Rouse model. For the dissipation of energy we are calculating the hysteresis loop A = ∮df R(f) and find a maximum of hysteresis if ω τR = 1 for ideal structures with τR as Rouse time which is confirmed by the simulations. The hysteresis for the different polymer architectures follow the predicted trend, but show specific deviations.