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Ionic Liquid Lignosulfonate: Dispersant and Binder for Preparation of Biocomposite Materials
Author(s) -
Guterman Ryan,
Molinari Valerio,
Josef Elinor
Publication year - 2019
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201907385
Subject(s) - dispersant , ionic liquid , lignin , lignosulfonates , cellulose , chemical engineering , chemistry , biocomposite , polyelectrolyte , ionic bonding , organic chemistry , materials science , polymer chemistry , polymer , ion , composite material , dispersion (optics) , catalysis , composite number , physics , optics , engineering
Ionic liquid lignins are prepared from sodium lignosulfonate by a cation exchange reaction and display glass transition temperatures as low as −13 °C. Diethyleneglycol‐functionalized protic cations inhibit lignin aggregation to produce a free‐flowing “ionic liquid lignin”, despite it being a high‐molecular‐weight polyelectrolyte. Through this approach, the properties of both lignin and ionic liquids are combined to create a dispersant and binder for cellulose+gluten mixtures to produce small microphases. Biocomposite testing pieces are produced by hot‐pressing this mixture, yielding a material with fewer defects and improved toughness in comparison to other lignins. The use of unmodified lignosulfonate, acetylated lignosulfonate, or free ionic liquid for similar materials production yields poorer substances because of their inability to maximize interfacial contact and complexation with cellulose and proteins.