Regensburg 2010 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 49: Elastomers and Gels
CPP 49.1: Talk
Friday, March 26, 2010, 10:15–10:30, H48
Reinforced elastomers: Measurement of the strain at various scales and mesoscale modelling of reinforcement and non linear properties. — •Paul Sotta1, Stéphane Dupres2, Samy Merabia3, Pierre-Antoine Albouy2, and Didier Long1 — 1Laboratoire Polymères et Matériaux Avancés CNRS/Rhodia, Saint-Fons, France — 2Laboratoire de Physique des Solides, CNRS/Université Paris 11, Orsay, France — 3Laboratoire de Physique de la Matière Condensée et Nanostructures, Université de Lyon, France
Combining mechanics, 2H NMR on stretched samples and measurement of strain-induced crystallization, we have measured the strain at various scales in polyisoprene elastomers reinforced with carbon black. We have shown that local strain inhomogeneity is more pronounced in the presence of more reinforcing carbon black grades [S. Dupres et al., Macromolecules, 2009, 42, 2634]. Related to these and other experimental results, we have developed a new mesoscale modelling of reinforced elastomers in which the glass transition temperature shift of the elastomer matrix close to fillers is implemented. The model gives a unified picture of an ensemble of complex phenomena in both the linear and nonlinear regimes of reinforced elastomers: reinforcement over a large temperature range, Payne and Mullins effects, plasticity [S. Merabia et al., Macromolecules, 2008, 41, 8252; S. Merabia et al., submitted to J. Polym. Sci. B, Polym. Phys., 2009].