Berlin 2018 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 5: Polymer Networks and Elastomers I

CPP 5.8: Talk

Monday, March 12, 2018, 11:45–12:00, PC 203

Application of the dynamic flocculation model for investigations of silica filled rubbers — •David Lockhorn and Manfred Klüppel — Deutsches Institut für Kautschuktechnologie e.V., Eupener Straße 33, D-30519 Hannover, Germany

The dynamic flocculation model (DFM) was introduced to describe the strong non-linear stress-strain behavior of filler reinforced rubbers. The model is able to describe stress-softening as well as hysteresis by a combination of well-established concepts for rubber elasticity and a micromechanical approach for the dynamic filler flocculation in strained rubbers. The stress value at a given strain leads back to an ongoing breakdown and reaggregation of filler clusters. Multihysteresis measurements of silica filled natural rubber (NR) and styrene-butadiene rubber (SBR) compounds will be described by the DFM and some of the physically meaningful parameters will be interpreted with respect to reinforcement in NR/Silica compounds. Besides this, the physicals as well as the modulus with increasing strain which is a measure for the Payne effect will be shown for the used model compounds. The results lead to the conclusion that there is a good coupling between silica and NR especially for the coupling agent silane as expected. But by looking at the Payne effect there is an unexpected high value for the coupling agent compounds in NR. This indicates that the micro-dispersion is not sufficient.