Solvent-free catalyst-free microwave-assisted acylation of lignin

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Journal titleIndustrial Crops and Products
Pages446453; # of pages: 8
SubjectAcetylation; Acylation; Catalysts; Esters; Solvents; Catalyst-free; Degrees of substitution; Maleation; Microwave assisted; Microwave-assisted methods; Polymeric matrices; Softwood kraft lignins; Solvent free; Lignin; Acetylation; Esterification; Lignins; Purification
AbstractValorization of lignin into biomaterials requires its good compatibility with the polymeric matrix it is incorporated into. Softwood Kraft lignin was esterified with various anhydrides (acetic, propionic, butyric, methacrylic, maleic) using a solvent-free, catalyst-free, microwave-assisted method. The esterification was fast and efficient (degrees of substitution >90% after 10 min). The reaction was worked up using water or ethanol as purification agent. Esterified lignins were characterized by FT-IR, GPC, quantitative 31PNMRand TGA/DSC.NMR analyses indicated that non-cyclic anhydrides reacted with both aliphatic and phenolic OH groups, while maleic anhydride reacted exclusively with aliphatic OH groups. All acylated lignins except the maleated one showed higher thermal stability than the unmodified lignin. Lignins acylated with non-cyclic anhydrides can be applied as green fillers in apolar polyolefins while maleated lignin can serve as metal adsorbent or macroreagent for the synthesis of polyesters or polyamides. We showed in this study that lignin can be modified in a fast and easy way.
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AffiliationNational Research Council Canada (NRC-CNRC); Aquatic and Crop Resource Development
Peer reviewedYes
NPARC number21277428
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Record identifiere0228745-b837-490b-aa43-ad8b4cc33dbe
Record created2016-03-09
Record modified2016-05-09
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