Extraction de nanofibrilles de cellulose à structure et propriétés contrôlées : caractérisation, propriétés rhéologiques et application nanocomposites

Abstract : The cellulose nanofibrils (CNF), obtained by TEMPO oxidation of native cellulose microfibrils as colloidal aqueous suspensions, are biosourced nanoparticles having rheological and optical properties well adapted for the conception of new nanomaterials with high performance.The main purpose of this study was to control and optimize the conditions for preparing these NFCs extracted from date palm tree by examining the oxidation time and the number of passes through the homogenizer..The success of the reaction was demonstrated by FT-IR spectroscopy. The rate of the carboxylic groups has been calculated by conductometric titration and ranged between 221 and 772 mol / g of anhydroglucose. Morphological studies show that oxidized CNFs are very individualized by introducing negative charges on their surfaces that induce electrostatic repulsion forces between the fibrils. Particular attention has been given to the viscoelasticity of oxidized-TEMPO CNF suspensions whose monitoring was carried out by a rheometer ARES-G2TA. These nanocharges were incorporated in a thermoplastic (PVAc) and nanocomposite materials obtained were characterized by SEM, TGA, DSC, DMA and mechanical testing.
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Karima Ben Hamou. Extraction de nanofibrilles de cellulose à structure et propriétés contrôlées : caractérisation, propriétés rhéologiques et application nanocomposites. Autre. Université Grenoble Alpes, 2015. Français. ⟨NNT : 2015GREAI073⟩. ⟨tel-01260323⟩

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