Dynamics in filled elastomers and consequences

Abstract : Model filled elastomers are studied in order to relate their microscopic structure to their macroscopic mechanical behavior. First, the polymer dynamics is studied by NMR and we highlight the existence of a gradient glass transition temperature around the solid fillers. We interpret the behavior of several samples at different temperatures with only two parameters: the thickness due to the grafters and the characteristic size of the gradient. This gradient model is still valid in the presence of solvent, as well as for the interpretation of calorimetric measurements. Moreover, the mechanical properties of the samples are measured in oscillatory shear. In addition to the Payne effect typically observed for reinforced elastomers, a non-harmonic signal is detected. The signal analysis shows the presence of strain-hardening and shearthinning within each cycle of solicitation. By comparison to the glassy bridge reinforcement model, we can attribute this behavior to the kinetics of destruction-rebirth of the glassy bridges during the solicitation. Finally, the arrangement of particles in each sample is determined by reverse Monte Carlo simulations based on neutron scattering measurements. Relating this to the polymer dynamics measurements, we show that there is not only a glassy polymer layer around the particles, but also a polymer fraction that is only slightly slowed-down but that contributes significantly to the non linear mechanical behavior of the samples.
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  • HAL Id : pastel-00733056, version 1

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Aurélie Papon. Dynamics in filled elastomers and consequences. Polymers. Université Pierre et Marie Curie - Paris VI, 2011. English. ⟨pastel-00733056⟩

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