Dresden 2011 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 34: Poster: Elastomers and Gels

CPP 34.3: Poster

Wednesday, March 16, 2011, 17:00–19:00, P2

Polymer dynamics and crosslink density of SBR nanocomposites containing fillers with different surface area — •Anas Mujtaba, M. Keller, S. Ilisch, H.-J Radusch, T. Thurn-Albrecht, K. Saalwächter, and M. Beiner — Faculty of Natural Sciences II & Center of Engineering Sciences, Martin-Luther-University, 06099 Halle/Saale, Germany

Styrene butadiene rubber (SBR) samples filled with different amounts of silica nanoparticles or mixtures of high-surface silica and low-surface borosilicate particles are investigated by dynamic shear measurements and solid state NMR. Aim is to study the influence of filler surface area on the properties of the SBR matrix. Shear data shows that substituting high- with low-surface filler at constant volume fraction is not only affecting reinforcement and plateau modulus but also energy dissipation in the plateau range. Glass temperature and frequency-temperature position of the main transition α of SBR matrix, however, are not much affected. Dynamic strain sweeps reveal the contribution of the filler network which breaks at large deformations. Double-quantum NMR data are used to determine crosslink densities. Absolute values for the crosslink densities of SBR composites are calculated using additional information from shear measurements on unfilled samples. The results imply that the effective crosslink density of the SBR matrix is slightly decreasing if filler content or filler surface area increases. In general, our findings indicate a strong influence of filler surface area on the composite properties. The implications for the optimization of SBR based composites for tyre applications are discussed.