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Synthese et propriétés mécaniques d'hydrogels polyélectrolytes modifiés par des groupements hydrophobes

Abstract : In this work, we synthesized a new type of hydrophobically modified hydrogels. These hydrogels were obtained by chemically crosslinking, using a thiol-ene reaction, polyelectrolytes (PAA) modified with alkyl groups grafted along the backbone. We obtained a hydrogel displaying both physical –due to the clustering of the hydrophobic groups- and chemical crosslinks. By comparing this system to a model PAA chemical hydrogel, we studied the role of the transient network on the mechanical properties, especially at large strains.
In the linear elastic region, we showed that the hydrophobic micelles strongly affect the loss modulus of the hydrogel without changing its storage modulus. At large strains, compression experiments suggested a second aggregation mechanism due to attractive electrostatic interactions between PAA chains. This phenomenon is strain induced and strongly coupled with the dissipative mechanisms induced by the reorganizations of the hydrophobic clusters occurring when the network is deformed. These dissipative mechanisms enhanced the mechanical strenght of the hydrogels. Preliminary results on fracture experiments are also presented.
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Contributor : Guillaume Miquelard-Garnier Connect in order to contact the contributor
Submitted on : Tuesday, December 2, 2008 - 11:56:51 PM
Last modification on : Thursday, December 16, 2021 - 3:58:18 AM
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  • HAL Id : tel-00343871, version 1


Guillaume Miquelard-Garnier. Synthese et propriétés mécaniques d'hydrogels polyélectrolytes modifiés par des groupements hydrophobes. Matériaux. Université Pierre et Marie Curie - Paris VI, 2007. Français. ⟨tel-00343871⟩



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