Controlling the Polyelectrolyte Nature of Sulfite Lignin in Order to Obtain Nanostructures

• Published in: Russian Journal of Physical Chemistry A 2022-11, Vol.96 (11), p.2482-2489
• Main Authors: Lugovitskaya, T. N., Rogozhnikov, D. A., Mamyachenkov, S. V.
• Format: Article
• Language: English
• Subjects: Aqueous solutions; Chemistry; Chemistry and Materials Science; Lignin; Lignosulfonates; Macromolecules; Nanoparticles; Organic liquids; Physical Chemistry; Physical Chemistry of Nanoclusters and Nanomaterials; Polydispersity; Polyelectrolytes; Self-assembly
• ISSN: 0036-0244; 1531-863X
• DOI: 10.1134/S0036024422110152

A study is performed of the electrochemical and hydrodynamic properties of sulfite lignin (lignosulfonate) in mixed aqueous–organic (EtOH/Ac) media. It is established that in an aqueous medium, lignosulfonate macromolecules exhibit the properties of a polyelectrolyte with a charge partially compensated for. It is found that in mixed aqueous–organic media, a transition is observed between modes of the behavior of lignosulfonate, from polyelectrolyte–ionomeric to ionomeric, and thus the separation of phases of the lignosulfonate–water–organic liquid system. The hydrodynamic size, polydispersity index, and ζ-potential of lignosulfonate-containing associates are determined. Air-dried nanopowders are obtained from mixed aqueous–organic media. It is shown that by changing the concentration of polyelectrolyte (0.020–200 g/dm 3 ), the nature (EtOH/Ac) and content (φEtOH/Ac = 0.60–73.0 vol %), and the way of introducing an organic liquid, it is possible to flexibly control self-assembly processes and obtain aqueous dispersions or air-dried nanopowders of LS with different sizes (40–500 nm) and morphologies (nanoparticles, vesicles).