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

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Melt processing of cellulose nanocrystals

Published on September 29, 2016
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PhD Defense September 23, 2016

Nagalakshmaiah Malladi, Ph.D. student of Laboratoire Rhéologie et Procédés and of LGP2, defended his Ph.D. thesis: "Melt processing of cellulose nanocrystals: thermal, mechanical and rheological properties of polymer nanocomposites".

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PAG-car_these3.jpg

This University Grenoble Alpes doctoral thesis was prepared under the supervision of Nadia El Kissi, CNRS Research Director (Laboratoire Rhéologie et Procédés, Grenoble), and the co-supervision of Alain Dufresne, Professor (Grenoble INP-Pagora / LGP2).

The low thermal stability and irreversible agglomeration issues are limiting the processing of polymer nanocomposites using cellulose nanocrystals as the reinforcing phase. In this context, thermally stable and highly dispersed cellulose nanocrystals were prepared by green processes (aqueous based methods) like physical adsorption and surface modification. These two different extrudable cellulose nanocrystals were used to reinforce hydrophobic polymers. Ensuing polymer nanocomposites had a positive impact on the storage modulus, tensile strength and Young’s modulus.

Importantly, no evidence of micro aggregates in the matrix was observed in the scanning electron microscopy images contrary to non-treated cellulose nanocrystals.

Both the surface modification and adsorption are water based methods and are industrially viable solutions.

Ph.D. thesis (2016)

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Date of update October 10, 2016

Grenoble INP Institut d'ingénierie Univ. Grenoble Alpes