Regensburg 2022 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 2: Polymer Networks and Elastomers
CPP 2.1: Talk
Monday, September 5, 2022, 09:30–09:45, H39
The non-ideal preparation state of polymer (model) networks — •Michael Lang1 and Toni Müller1,2 — 1Institut Theorie der Polymere, Leibniz Institut für Polymerforschung Dresden, Hohe Straße 6, 01069 Dresden, Germany — 2Institut für Theoretische Physik, Technische Universität Dresden, Zellescher Weg 17, 01069 Dresden, Germany
We demonstrate that the phantom modulus can be split into two major contributions: the cycle rank of the active network structure and a correction resulting predominantly from non-ideal chain conformations at the instance of cross-linking. The correction contains several contributions related to loop formation, an effective repulsion between network junctions, and an excess strain of chains that develops towards the end of the reactions, if reaction partners become sparse. This challenges the text-book assumption that network strands are incorporated into the network with the same conformations as a free chain inside the reaction container. Our results are relevant for developing a better understanding of rubber elasticity and its dependence on the network formation process.