Chemical Modification of Plasticized Lignins Using Reactive Extrusion: From Biomass to Advanced Bio-Based Chemicals & Materials: A Multidisciplinary Perspective

The reaction of esterification of plasticized Kraft lignin (KL) with succinic and maleic anhydrides using reactive extrusion (REX) was studied in detail. DMSO, glycol and glycerol were found to be efficient plasticizers for lignin. The chemical structure of these new lignin esters was determined usi...

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Bibliographic Details
Published in:Frontiers in chemistry 2019-09, Vol.7
Main Authors: Milotskyi, Romain, Szabo, Laszlo, Takahashi, Kenji, Bliard, Christophe
Format: Article
Language:English
Subjects:
Chemical engineering
Chemical Sciences
Life Sciences
Material chemistry
Organic chemistry
Other
Polymers
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Summary:The reaction of esterification of plasticized Kraft lignin (KL) with succinic and maleic anhydrides using reactive extrusion (REX) was studied in detail. DMSO, glycol and glycerol were found to be efficient plasticizers for lignin. The chemical structure of these new lignin esters was determined using Solid-state 13C CP-MAS NMR and FT-IR analysis. 31P NMR analysis of phosphitylated lignins showed that the aliphatic OH groups of lignin had superior reactivity under the reactive extrusion reaction conditions. The formation of monoesters was confirmed by HSQC NMR spectroscopy. Molecular weight changes after extrusion process were studied using GPC/SEC chromatography. Thermal properties of these polymers were assessed by TGA analysis. The results were compared to lignin esters modified in classical batch conditions. These results show that REX can be used as a new fast, solvent free, and continuous process for lignin valorization.
ISSN:2296-2646
DOI:10.3389/fchem.2019.00633