Berlin 2005 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

CPP: Chemische Physik und Polymerphysik

CPP 9: SYMPOSIUM: Polymer networks and beyond: From molecular structure to materials and biological functions POSTER

CPP 9.15: Poster

Samstag, 5. März 2005, 16:45–18:45, Poster TU D

Length scales and mechanisms of motion in entangled polymer melts — •Ekkehard Straube¹ and Ralf Everaers² — ¹Martin-Luther-Universität Halle-Wittenberg, Fachbereich Physik, 06099 Halle — 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 scale and orientational correlations of the fluctuation structure of the copies gives estimations of the tube radius and the step length of the primitive path.