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DYNAMIQUE, DÉFORMATIONS LOCALES ET IRRÉVERSIBILITÉS DANS DES ÉLASTOMÈRES RENFORCÉS PAR DU NOIR DE CARBONE.

Abstract : Reinforced elastomers are nanocomposite materials made of an elastomer matrix filled with nanometric inorganic particles or aggregates. Great interest is focussed at the moment on their remarkable mechanical properties, on both the industrial and fundamental sides: reinforcement, non-linear behaviour, irreversibility, outstanding resistance to tear and abrasion.Filled rubbers of practical interest are most often reinforced with carbon black aggregates, which exhibit fractal structures with various morphologies. We shall present some experimental results which give some insight into the microscopic processes which are responsible for the mechanical behaviour of these systems. By correlating deuterium NMR and stress measurements at large draw ratio, we show that the elastic energy stored in the system at the scale of polymer chains depends essentially on the carbon black morphology.Plasticity is an important aspect of the behaviour of reinforced elastomers. This is a challenge in industrial applications as well. It may be related to two phenomena that can lead to microscopic irreversibility : the presence of a rigid polymer layer in the vicinity of filler particles, and/or non-affine deformation of the network of solid particles/aggregates, at a scale that remains to be defined. SAXS allowed us to prove the existence of non affine deformations at the scale of the CB aggregates under large draw ratios.
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https://tel.archives-ouvertes.fr/tel-00154875
Contributor : Stephane Dupres <>
Submitted on : Thursday, June 14, 2007 - 10:34:50 PM
Last modification on : Wednesday, October 14, 2020 - 4:00:13 AM
Long-term archiving on: : Friday, September 21, 2012 - 4:35:15 PM

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  • HAL Id : tel-00154875, version 1

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Stephane Dupres. DYNAMIQUE, DÉFORMATIONS LOCALES ET IRRÉVERSIBILITÉS DANS DES ÉLASTOMÈRES RENFORCÉS PAR DU NOIR DE CARBONE.. Matière Condensée [cond-mat]. Université Paris Sud - Paris XI, 2006. Français. ⟨tel-00154875⟩

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