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Propriétés structurales et dynamiques des solutions de polyélectrolytes rigides et semi-rigides et de polysaccharides associatifs

Abstract : Dynamic and static light scattering experiments were performed on aqueous solutions of semirigid and rigid polyelectrolytes in the dilute and semidilute regime in the presence of 0.1M NaCl. In the dilute regime typical good solvent behavior is found. However, in the semidilute regime, the time autocorrelation function is found to be bimodal. The short time relaxation is characterized by the cooperative diffusion of blobs. The behavior of the long time relaxation indicates the presence of associations or microgels. We have also examined the structure and the dynamics of alkyl chitosans. We observed four regions in the phase diagram in aqueous solution: (i) a supernatant phase (unimers phase) at low concentration; (ii) solutions of intermolecularly bridged "flowerlike" micelles at intermediate polymer concentration; (iii) a phase separation between a viscous solution and a solid-like gel and (iv) an associative gel phase at high polymer content consisting of interconnected flowers.
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Contributor : Catherine Esquenet <>
Submitted on : Thursday, March 25, 2004 - 4:03:32 PM
Last modification on : Friday, November 6, 2020 - 4:09:16 AM
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Catherine Esquenet. Propriétés structurales et dynamiques des solutions de polyélectrolytes rigides et semi-rigides et de polysaccharides associatifs. Matériaux. Université Joseph-Fourier - Grenoble I, 2003. Français. ⟨tel-00005468⟩

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