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LGP2, a center of innovative research
LGP2, a center of innovative research

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Cellulose nanofibrils & nanocomposites

Published on January 26, 2016
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PhD Defense October 24, 2015

Karima Ben Hamou, LGP2's Ph.D. student, defended her thesis: "Extraction of structure and properties controlled cellulose nanofibrils: characterization, rheological and nanocomposites applications".

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PAG-car_these4.jpg

This Université Grenoble Alpes doctoral thesis was prepared under the supervision of Alain Dufresne, Professor (Grenoble INP-Pagora / LGP2) and of Hamid Kaddami, Professor (Faculty of Science and Technology Marrakech, Morocco).

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 well 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 nanofillers were incorporated in a thermoplastic polymer (PVAc) and nanocomposite materials obtained were characterized by SEM, TGA, DSC, DMA and mechanical testing.

LGP2 Ph.D. thesis (2015)

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Date of update February 2, 2016

Grenoble INP Institut d'ingénierie Univ. Grenoble Alpes