Berlin 2012 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 23: Poster: Polymer Dynamics

CPP 23.4: Poster

Mittwoch, 28. März 2012, 11:00–13:00, Poster A

The behaviour of a nanoparticle in a polymer melt — •Anja Kuhnhold and Wolfgang Paul — Institut für Physik, Martin-Luther-Universität, 06099 Halle

The rheology of polymer melts can be observed by looking at the behaviour of suspended particles (microrheology). For this purpose MD simulations of a bead-spring model including one nanoscopic particle are performed. The dynamic behaviour of the nanoparticle is determined by its mean square displacement (MSD) and velocity autocorrelation function (VCF). Using a generalized Stokes-Einstein equation, we observe the complex shear modulus G^*(ω) of the melt. Furthermore, the influence of different particle sizes, interaction strengths and polymer chain lengths is studied. The results are in agreement with predictions of the Rouse model in the low frequency regime. Additional structural information of the polymer melt in the vicinity of the nanoparticle are given by radial distribution functions (RDFs).