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Ionic liquids as new solvents of natural polymers

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Fibre Chemistry Aims and scope

The study conducted led to the following conclusions: — Ionic liquids based on the 1-butyl-3-methylimidazolium cation are not solvents for most synthetic polymers, but dissolve natural polymers characterized by a large number of H bonds in the supramolecular structure up to high concentrations. — The dissolving power of IL based on the 1-butyl-3-methylimidazolium cation is a function of the nature of the anion and the value of the negative charge on its electron-donor sites: IL with an acetate anion dissolve natural polymers better than liquids with a chloride anion. — An increase in the length and number of hydrophobic alkyl radicals in the imidazolium cation increases the hydrophoby of the IL and is accompanied by a decrease in the dissolving power with respect to natural polymers. The charge distribution in the imidazolium cation is a function of the length and number of alkyl radicals, determines the strength of the cation—anion bond, and the dissolving power of the IL changes proportionally to this strength. — Incorporation of proton-donor diluents decreases the dipole moment and value of the negative charge of the IL anion, which results in loss of the dissolving power of the binary mixture. — Aprotic diluents can be incorporated in these IL, and the change in the dissolving power of the binary mixture will be a function of the donor capacity of the aprotic diluent: a smaller decrease in the dissolving power is observed for the binary mixture in which the diluent has a lower donor number and more weakly competes with the IL for formation of hydrogen bonds with the polymer.

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Authors and Affiliations

  1. St. Petersburg State University of Technology and Design, St. Petersburg, Russia

    E. S. Sashina, N. P. Novoselov, O. G. Kuz’mina & S. V. Troshenkova

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  1. E. S. Sashina
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  2. N. P. Novoselov
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  3. O. G. Kuz’mina
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  4. S. V. Troshenkova
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Translated from Khimicheskie Volokna, No. 3, pp. 75–80, May–June, 2008.

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Sashina, E.S., Novoselov, N.P., Kuz’mina, O.G. et al. Ionic liquids as new solvents of natural polymers. Fibre Chem 40, 270–277 (2008). https://doi.org/10.1007/s10692-008-9051-4

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  • DOI: https://doi.org/10.1007/s10692-008-9051-4

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