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Mechanochemical Synthesis of Ethoxyaminohumic Acids and Surface-Active Properties of Their Solutions at Solution–Air Interface

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Abstract—

Ethoxyamine derivatives of humic acids have been obtained by mechanochemical synthesis via the simultaneous interaction of humic acids with poly(ethylene glycol) (PEG-6000 and PEG-1500) and an aminating reagent (urea, hydroperitum, or cyanoguanidine) in a vibrating apparatus. Reaction products have been characterized by IR spectroscopy, acid–base potentiometric titration, and viscometry. Tensiometric and rheological characteristics of the surface layers of solutions of salts of the synthesized derivatives of humic acids have been studied by the pendant drop and oscillating pendant drop methods. The solutions of the salts of ethoxyaminohumic acids have been found to exhibit a pronounced surface activity at the air–water interface. The experimental dependences of the viscoelastic modulus on the surface pressure and the concentration of the solutions of ethoxyaminohumic acid salts are in satisfactory agreement with the functions calculated in terms of the theoretical model of bimolecular adsorption. The presence of amino groups in the structure of ethoxyaminohumic acids predetermines their high solubility in the acidic pH region. The simultaneous incorporation of ethoxy and amino groups into humic acid macromolecules makes it possible to obtain a novel type of surfactants, which combine three functions, i.e., the functions of anionic, cationic, and nonionic surfactants.

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Funding

This work was supported by the Ministry of Science and Higher Education of the Russian Federation, budget scope “Study of reactions of mechanochemical synthesis involving natural and synthetic polymers and organic compounds (FRES-2023-0002).”

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  1. Litvinenko Institute of Physical-Organic Chemistry and Coal Chemistry, 283114, Donetsk-114, Russia

    S. L. Khil’ko, V. S. Shelest, M. I. Rogatko, R. A. Makarova & R. G. Semenova

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  1. S. L. Khil’ko
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Khil’ko, S.L., Shelest, V.S., Rogatko, M.I. et al. Mechanochemical Synthesis of Ethoxyaminohumic Acids and Surface-Active Properties of Their Solutions at Solution–Air Interface. Colloid J 85, 1002–1013 (2023). https://doi.org/10.1134/S1061933X23600963

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