Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 20: Poster Session I
CPP 20.27: Poster
Montag, 12. März 2018, 17:30–19:30, Poster A
The elasticity of real polymer networks without entanglements — •Michael Lang1, Toni Müller1,2, and Jens-Uwe Sommer1,2 — 1Institut Theorie der Polymere, Leibniz-Institut für Polymerforschung Dresden, Hohe Straße 6, 01069 Dresden, Germany — 2Technische Universität Dresden, Institut für Theoretische Physik, Zellescher Weg 17, 01069 Dresden, Germany
We develop a method that allows to analyze directly the local contributions of individual strands to rubber elasticity. This method is used to quantify the impact of cyclic defects on elasticity for 4-functional model networks that were prepared at a different polymer volume fraction and with a different degree of polymerization between the cross-links. Using the bond fluctuation model for simulations, entanglements and excluded volume can be switched off separately, which allows for a direct quantification of the effect of excluded volume on the phantom modulus of a network. We test our estimate of the phantom modulus with the modulus as measured from shearing the networks without excluded volume. For networks with excluded volume switched on, we find that excluded volume renormalizes fluctuations but has virtually no impact on the elasticity of the networks. However, the inactive material, which is connected to the network through a single point now couples partially to the shear deformation of the elastically active network, such that considering a zero contribution of the inactive material underestimates the phantom modulus.