Berlin 2012 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 20: (Hydro)gels and Elastomers
CPP 20.6: Vortrag
Mittwoch, 28. März 2012, 10:45–11:00, C 264
Polymer Dynamics and Crosslink Density of SBR Nanocomposites Containing Fillers with Different Surface Area — •Anas Mujtaba1, Melanie Keller2, Sybill Ilisch2, Hans-Joachim Radusch2, Thomas Thurn-Albrecht1, Kay Saalwächter1, and Mario Beiner1 — 1Faculty of Natural Sciences II, Martin-Luther-University Halle-Wittenberg, Germany — 2Center of Engineering Sciences, Martin-Luther-University Halle-Wittenberg, 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 composites. 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 effective crosslink density of the SBR matrix is slightly decreasing if filler content or filler surface area increases. Shear data show that substituting high- with low-surface area silica 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 composite, however, are not much affected. Dynamic strain sweeps in the plateau reveal the contribution of the filler network which breaks at large deformations.