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Rheological study of a new semi-rigid giant polysaccharide for the mechanical reinforcement of hydrogels

Abstract : We study the relationship structure/properties of rigid hydrogels composed of a new giant polysaccharide, sacran. This novel polysaccharide has a contour length larger than 10 μm and an intrinsic length of persistence of approximately 60 nm. By crosslinking the chains of this polysaccharide we expect prepare rigid networks, in which the mesh size is controlled by rigid chain segments. Physical (transient bonds) and chemical hydrogels of sacran have been prepared and their rheological properties have been studied. The formation of rigid networks of sacran has been demonstrated by using the non-conventional microrheology by DWS allowing to characterize the dynamics at single chain scale of the network. Different specific rheological signatures of these rigid networks have been highlighted and strain-hardening properties have been observed in the non-linear regime for the chemical gels, as well as for the physical gels. The strain-hardening observed for the chemical gels, which are large compared to those of other biopolymers reported in the literature, were modeled to obtain the structural parameters of these networks which lead to their hardening.
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https://tel.archives-ouvertes.fr/tel-01661493
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Submitted on : Tuesday, December 12, 2017 - 12:38:23 AM
Last modification on : Sunday, October 25, 2020 - 1:57:15 PM

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  • HAL Id : tel-01661493, version 1

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Tom Saint-Martin. Rheological study of a new semi-rigid giant polysaccharide for the mechanical reinforcement of hydrogels. Chemical Physics [physics.chem-ph]. Université Pierre et Marie Curie - Paris VI, 2017. English. ⟨NNT : 2017PA066165⟩. ⟨tel-01661493⟩

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