Catalytic hydroesterification of lignin: A versatile and efficient entry into fully biobased tunable materials
Résumé
Hydroxyl groups of several industrial grade lignins are esterified thanks to palladium-catalyzed hydroesterification reactions with CO and olefins, fatty esters or 1,3-butadiene. The reaction is efficient, salt-free and allows introducing aliphatic chains to lignin through ester linkage. Technical and modified lignins are characterized by NMR, IR, SEC and thermal properties are evaluated by DSC. The esterified lignins show modified glass transition temperatures that depend on the substitution degree of the hydroxyl groups and on the nature of the aliphatic chains that have been introduced. The implementation of this catalysis also opens up the possibility of inserting new reactive functionalities such as esters or unsaturations from abundant and/or biobased reactants.
Mots clés
Domaines
Chimie
Origine : Fichiers produits par l'(les) auteur(s)