Effect of Fatty Acid Esterification on the Thermal Properties of Softwood Kraft Lignin

Klaus A.Y. Koivu*, Hasan Sadeghifar, Paula A. Nousiainen, Dimitris S. Argyropoulos, Jussi Sipilä

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

41 Citations (Scopus)

Abstract

Esterification of kraft lignin inherently addresses its potential for thermoplastic applications either on its own or as a component of polymer blends. In this effort, we have investigated the selectivity of softwood kraft lignin toward esterification via acylation. LignoBoost kraft lignin was esterified with acetyl (C2), octanoyl (C8), lauroyl (C12), and palmitoyl (C16) chlorides at various molar ratios with respect to the total hydroxyls present. Quantitative 31P NMR spectroscopy, Fourier transform infrared spectroscopy (FTIR), and gel permeation chromatography (GPC) were used to evaluate the selectivity and efficiency of these reactions on the various hydroxyl groups present. The C8-C16 acyl chlorides showed distinct enhanced reactivity toward the aliphatic hydroxyl groups, whereas C2 acyl chloride was found to react uniformly with any available OH irrespective of their chemical nature. The effects of long chain acylation on the polymer and material properties were also examined using solution viscosity, thermal, and rheological measurements. Polymer blends were also produced and studied by melt extrusion. The long aliphatic chains when installed on the lignin displayed peculiar association effects in solution and enhanced the melt flow characteristics of the lignin-polymer blends.

Original languageEnglish
Pages (from-to)5238-5247
Number of pages10
JournalACS Sustainable Chemistry and Engineering
Volume4
Issue number10
DOIs
Publication statusPublished - 3 Oct 2016
MoE publication typeA1 Journal article-refereed

Keywords

  • Characterization
  • Fatty acid esterification
  • Methylation
  • Polymer blends
  • Quantitative P NMR
  • Softwood kraft lignin
  • Thermal and rheological properties

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