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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 8: POSTER: Polymer Physics

CPP 8.22: Poster

Monday, March 26, 2007, 16:00–18:00, Poster B

Thermomechanical Investigations of Filled Rubbers — •Willibald Hengl, Gerald Johannes Schneider, and Dietmar Göritz — Institut für Physik, Universität Regensburg, 93040 Regensburg

The reinforcing mechanism of rubber fillers is still an interesting topic. We made investigations of uniaxial elongation of filled rubbers by deformation calorimetry, whereby the change of internal energy can be calculated from the measured mechanical work and heat.

We present experiments mainly on silica-filled Polydimethylsiloxane (PDMS) with varying filler content and silica with and without a silane additive. As filled elastomers usually show strain-softening, the extensions have been repeated.

Although there are different stress-strain relations for each experiment, it is found, that the change of internal energy is predominantly controlled by the true stress acting on the specimen, independent of the composition and the history of the samples.