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Theses

Étude de l'auto-réparation d'élastomères supramoléculaires

Abstract : In the last thirty year, an active research has been devoted to the design of selfhealing materials that are able to sense damage and respond autonomously in order to restore their original properties. For this work, we have studied the remarkable self-healing of supramolecular elastomers formed by a network of oligomers associated through weak and reversible hydrogen bonds. An experimental approach has been developed to characterize quantitatively the adhesion between two elastomer surfaces and more precisely to compare the self-adhesion of aged surfaces close to thermal equilibrium to the self-healing of out-ofequilibrium fracture surfaces. Over a wide range of contact times from 1s to 17h, we find that the separation of fracture surfaces that were brought back into contact requires an energy almost one order of magnitude larger than for aged surfaces. Combining these experiments to thermal treatments, we could verify that annealing fracture surfaces prior to contact greatly accelerate the loss of their self-healing power. These results strongly suggest that such a deactivation is governed by the reconstruction process of out-of-equilibrium surfaces and not by some contamination phenomenon. More generally, measuring the intensity and kinetics of healing and deactivation processes provides new data to better understand the molecular mechanisms at stake in the self-healing of these materials. In a last part, our approach has been applied to the characterization of self-adhesion of hybrid epoxy networks combining covalent cross-links and supramolecular bonds.
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Submitted on : Monday, January 16, 2012 - 4:39:54 PM
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Florine Maes. Étude de l'auto-réparation d'élastomères supramoléculaires. Matériaux. École Nationale Supérieure des Mines de Paris, 2011. Français. ⟨NNT : 2011ENMP0049⟩. ⟨pastel-00660450⟩

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