Regensburg 2004 – wissenschaftliches Programm
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DY: Dynamik und Statistische Physik
DY 51: Polymers and Colloids
DY 51.6: Vortrag
Freitag, 12. März 2004, 12:00–12:15, H3
Rheology and Microscopic Topology of Entangled Polymeric Liquids — •Ralf Everaers1, Sathish K. Sukumaran2, Gary S. Grest3, Carsten Svaneborg1, Arvind Sivasubramanian2, and Kurt Kremer2 — 1Max-Planck-Institut fr Physik komplexer Systeme, Nöthnitzerstr. 38, 01187 Dresden, Germany — 2Max-Planck-Institut für Polymerforschung, Ackermannweg 10, 55128 Mainz, Germany — 3Sandia National Laboratories, Albuquerque, New Mexico 87185, USA
The viscoelastic properties of entangled polymeric liquids are dominated by topological constraints on a molecular level. These entanglements confine the motion of individual polymers to a curvilinear diffusion along the coarse grained chain contours, the reptation tube. The relationship between the reptation tube and the static structure of the entangled polymers, however, has remained unclear. Here, we present a “primitive path” analysis of the microscopic topological state of (bead-spring) model polymer solutions and melts and show that the predicted plateau moduli, GN0, are in quantitative agreement with the experimentally determined values for all major classes of synthetic polymers. Our approach opens the way to a systematic study of structure-property relations and a direct observation of the major relaxation mechanisms for polymers discussed in the literature: reptation, constraint release and contour length fluctuations of the primitive path.