Willow Lignin Recovered from Hot-Water Extraction for the Production of Hydrogels and Thermoplastic Blends

ChemSusChem
Aditi NagardeolekarBiljana Bujanovic

Abstract

A blend of commercial willow cultivars ( Salix  spp.)  of willow was subjected to hydrothermal pretreatment; hot-water extraction in a pilot plant 65-ft 3  digester. Lignin recovered from the autohydrolyzate (willow lignin, WL) was used to produce hydrogels and thermoplastic blends. Lignin-kaolin-acrylamide (WL 10.7% w/w) and lignin-poly(ethylene)glycol diglycidyl ether (WL 66.7% w/w) hydrogels exhibited favorable adsorption and absorption properties, respectively. Dye adsorption kinetics, swelling capacities, fragrance emanation, and compression moduli were measured for the hydrogels, along with SEM characterization. Additionally, willow lignin was esterified by acetylation (C 2 , WAc) and acylation with lauroyl chloride (C 12 , WFA, WFA H ). The crude and esterified lignin samples were blended (1-12% w/w) with polylactic acid (PLA) via lab-scale melt extrusion to produce thermoplastic blends. The physicochemical properties of the blends were evaluated. They exhibited an increase in degradation temperature and UV absorbance with potential to hinder photodegradation of PLA and may be leveraged in packaging applications.

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Citations

Apr 11, 2021·International Journal of Biological Macromolecules·Bharat MannaAmit Ghosh

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