Dresden 2017 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 22: Polymer Networks and Dynamics II: Structure and Dynamics

CPP 22.5: Vortrag

Dienstag, 21. März 2017, 10:30–10:45, ZEU 250

Cross-link fluctuations in entangled networks — •Michael Lang — Leibniz-Institut für Polymerforschung, Hohe Straße 6, 01069 Dresden, Germany

Cross-link fluctuations affect the instantaneous and time average bond orientations in entangled networks that are measured as birefringence or by Nuclear Magnetic Resonance respectively. In order to develop a quantitative model for cross-link fluctuations, computer simulation data on junction fluctuations in end-linked model networks are analyzed using the framework of the constrained junction model and the slip tube model of entangled networks. We discuss an analytical expression for cross-link fluctuations that compares well with simulation data on elasticity and residual bond orientations. As a consequence, cross-link fluctuation data can be used to estimate the tube diameter.