[PHD DEFENSE] – 3C3M – CLAUDIE SIMON

Pr Nicolas BROSSE 

Thesis reporter

EC, LERMAB, Université de Lorraine

Dr Paul-Henri DUCROT 

Thesis reporter

DR, INRAE, Université Paris-Saclay

Dr Cédric FISHMEISTER 

Thesis examiner

EC, ISCR, Université de Rennes

Pr Sofiane GUESSASMA

Invited member

DR, INARE, Université de Nantes

Dr Tiphaine RICHARD

Invited member

EC, Icam de Lille

Pr Mathieu SAUTHIEUR 

Thesis supervisor

EC, UCCS, Université de Lille

Dr Clément DUMONT

Thesis supervisor

EC, Icam de Lille

Dr Ghinwa El-hajj SLEIMAN 

Thesis Advisor

EC, Icam de Nantes

Lignin, functionalization, catalysis, 3D printing

   Lignin, an abundant by-product of the pulp and paper industry, was investigated as a resource for the development of 3D printing materials. The ANR project MAGNELIN4D aims to utilize lignin for the production of filaments for 4D printing, by combining it with bio-based polymers and magnetite. This thesis focused on the chemical modification of lignin to improve its compatibility with polymer matrices. Two complementary approaches were implemented. The first consisted of preparing functional molecules for lignin grafting through ring-opening reactions, in particular using glycerol carbonate and methyl undec-10-enoate. The second aimed to modulate the introduced unsaturations via cross-metathesis reactions. These strategies led to functionalized lignins with high hydroxyl substitution degrees and enriched with aliphatic chains. Finally, several modified lignins were incorporated into polymer formulations and processed into 3D printing filaments. Preliminary shaping and printing tests validated the printability of this approach and paved the way for the development of bio-based materials suitable for innovative 3D printing applications. This work was supported by a wide range of measuring techniques, including NMR and FT-IR spectroscopy, DSC, TGA, GPC, and tensile testing.