Regensburg 2007 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 7: POSTER: INTERNAL SYMPOSIUM Scattering Experiments

CPP 7.17: Poster

Montag, 26. März 2007, 16:00–18:00, Poster B

Modelling the structure of fillers in rubber and their small angle scattering — •Klaus Nusser, Gerald Johannes Schneider, and Dietmar Göritz — Universität Regensburg, Universitätsstr. 31, 93053 Regensburg

Silicas are technically important fillers for elastomers with respect to several applications. In such a filler-rubber system the mechanical properties strongly depend on the kind and the concentration of the filler. Despite being cruciable for the adjustment of high performance materials, the exact correlation between the morphology of the filler and the related reinforcement of the material is still unknown.

An up-to-date constitutive model suggests that isotropic silica primary particles form fractal clusters, which work as a basic unit for larger cluster structures. This notion was gained by the analysis of small angle X-ray scattering curves, which show regions of constant slope in a log-log plot. However, conclusions from scattering curves are not unique. In order to examine the assumptions made in constitutive models, numerical investigations were performed. Scattering structures were generated and their scattering curves were calculated by means of a computer. In particular, the origin of regions of constant slope in log-log depicted scattering curves was investigated.