Dresden 2006 – scientific programme

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CPP: Chemische Physik und Polymerphysik

CPP 26: POSTER Dynamics and Diffusion

CPP 26.13: Poster

Thursday, March 30, 2006, 17:00–19:00, P2

Length scales and mechanisms of motion in entangled polymer melts — •Ekkehard Straube¹ and Ralf Everaers² — ¹Martin-Luther-Universität Halle-Wittenberg, Fachbereich Physik, Germany — ²Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Str. 38, Dresden, Germany

Using a lattice-free dynamical Monte-Carlo method for rod-bead chains up to 512 segments as models of entangled polymer melts the monitoring of the behavior of copies of the system subjected to identical entanglement conditions but different time evolutions created by different sequences of random numbers allows the investigation of the structure of the topological constraints. The investigation of systems with different segment densities supports that the packing length governs the local motion in entangled melts. The analysis of the fluctuation structure of the copies allows the construction of the corresponding tube axis, the tube radius, the step length of the primitive path and the Rouse-like dynamics of the tube axis due to constraint release processes.