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

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Cellulose pretreatments for a nanofibrillation by twin-screw extrusion

Published on March 15, 2019
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PhD Defense February 1, 2019

Fleur ROL, Ph.D. student of LGP2, defended her thesis: "Cellulose pretreatments for a nanofibrillation by twin-screw extrusion".

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PAG-car_these5.jpg

This University Grenoble Alpes doctoral thesis was prepared under the supervision of Julien BRAS, Associate Professor HDR (Grenoble INP-Pagora / LGP2).

Fleur ROL presented the results of her research work entitled Cellulose pretreatments for a nanofibrillation by twin-screw extrusion.

F. Rol PhD thesis 2019The CERISE project, conducted under the auspices of the Tec21 Laboratory of Excellence and the Carnot PolyNat Institute, aims to develop a new process for manufacturing cellulose nanofibrils (CNF) with a high dry matter content and low energy consumption. Twin screw extrusion (TSE) – industrially well-known energy-efficient and highly adaptable technique – was optimized to produce CNF at 20 % dry content. By decreasing considerably their water content, this new strategy improves their transport cost, their storage and extends their field of application.

The objectives were to
• Develop new pretreatments of cellulose fibers to facilitate the nanofibrillation and produce high quality functionalized CNF.
• Optimize TSE screw profile and conditions to produce CNF.
• Prepare new materials made of this new type of CNF.

Four chemical pretreatments, identified as easily industrializable, have been optimized. Extrusion nanofibrillation was simulated by software to obtain optimal extrusion conditions. This cost-effective approach was validated at semi-industrial scale. Various applications are considered for these new NFC with a high dry matter content.
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Date of update March 15, 2019

Grenoble INP Institut d'ingénierie Univ. Grenoble Alpes