Regensburg 2013 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 48: (Hydro)gels and Elastomers
CPP 48.1: Hauptvortrag
Freitag, 15. März 2013, 09:30–10:00, H39
The distribution of segmental order in polymer networks — •Michael Lang1 and Jens-Uwe Sommer1,2 — 1Leibniz Institut für Polymerforschung Dresden, Hohe Straße 6, 01069 Dresden — 2Institut für Theoretische Physik, Technische Universität Dresden, 01062 Dresden
The monomer fluctuations and the distribution of segmental order is derived for a slip tube model of polymer entanglements assuming random walk statistics of the tube sections [M. Lang, J.-U. Sommer, Physical Review Letters 104 (2010) 177801]. The predictions are compared with simulation data of model networks that were created using the bond fluctuation method. The comparison reveals that local fluctuations of the tube statistics do not affect the distribution function as averaged over the full sample. Instead, length fluctuations of the confining tube control the shape of the distribution function. Furthermore, a narrowing of the distribution function is determined, if the cross-linking occurs on the time scale of the relaxation of the network strands. Almost instantaneously cross-linked poly-disperse samples do not show this narrowing and are well described by tube length fluctuations that agree to previous work on the dynamics of melts of star polymers. The difference between the stress optical law and the time average segment orientations is discussed and our results are compared to previous simulation studies in literature.