Dresden 2017 – wissenschaftliches Programm
CPP 29.2: Vortrag
Dienstag, 21. März 2017, 14:15–14:30, ZEU 250
Analysis of entanglement effect on deformed polymer melts in non-linear viscoelastic regime — •Hsiao-Ping Hsu and Kurt Kremer — Max Planck Institute for Polymer Research
Dynamics of polymer melts are strongly affected by the entanglement effect due to the topological constraints between chains in melts both in linear and non-linear viscoelastic regime. Starting from the fully equilibrated and highly entangled bead-spring chains in melts we deform the melts by isochoric uniaxial-elongation with fixed strain rate. The strain rate is chosen such that it is fast compared to the global relaxation but slow compared to the local relaxation on the scale of the tube diameter. We study the dynamic and static properties, and the topological structures of strongly deformed polymer melts during the relaxation process in detail by molecular dynamics simulations using the package ESPResSo++. Through the primitive path analysis (PPA), the entanglement points are identified according to the curvature along the primitive path of chains. We show that the distribution of entanglement points of polymer melts becomes inhomogeneous, and the tension forces along the original and primitive paths in the stretching direction are equivalent.