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Article

Hydrophobic Modification of Chitosan via Reactive Solvent-Free Extrusion

1
Enikolopov Institute of Synthetic Polymeric Materials, Russian Academy of Sciences, 70 Profsoyuznaya St., 117393 Moscow, Russia
2
Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, 4 Kosygina St., 119991 Moscow, Russia
*
Author to whom correspondence should be addressed.
Academic Editors: Roland Kuen Ren Chen and Yancheng Wang
Polymers 2021, 13(16), 2807; https://doi.org/10.3390/polym13162807
Received: 29 July 2021 / Revised: 17 August 2021 / Accepted: 18 August 2021 / Published: 21 August 2021
(This article belongs to the Special Issue Polymer Composites for 3D Printing)
Hydrophobic derivatives of polysaccharides possess an amphiphilic behavior and are widely used as rheological modifiers, selective sorbents, and stabilizers for compositions intended for various applications. In this work, we studied the mechanochemical reactions of chitosan alkylation when interacting with docosylglycidyl and hexadecylglycidyl ethers in the absence of solvents at shear deformation in a pilot twin-screw extruder. The chemical structure and physical properties of the obtained derivatives were characterized by elemental analysis, FT-IR spectroscopy, dynamic light scattering, scanning electron microscopy, and mechanical tests. According to calculations for products soluble in aqueous media, it was possible to introduce about 5–12 hydrophobic fragments per chitosan macromolecule with a degree of polymerization of 500–2000. The length of the carbon chain of the alkyl substituent significantly affects its reactivity under the chosen conditions of mechanochemical synthesis. It was shown that modification disturbs the packing ability of the macromolecules, resulting in an increase of plasticity and drop in the elastic modulus of the film made from the hydrophobically modified chitosan samples. View Full-Text
Keywords: chitosan alkylation; alkyl glycidyl ethers; solid state organic reactions; mechanochemical synthesis; hydrophobic derivatives chitosan alkylation; alkyl glycidyl ethers; solid state organic reactions; mechanochemical synthesis; hydrophobic derivatives
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MDPI and ACS Style

Akopova, T.A.; Demina, T.S.; Khavpachev, M.A.; Popyrina, T.N.; Grachev, A.V.; Ivanov, P.L.; Zelenetskii, A.N. Hydrophobic Modification of Chitosan via Reactive Solvent-Free Extrusion. Polymers 2021, 13, 2807. https://doi.org/10.3390/polym13162807

AMA Style

Akopova TA, Demina TS, Khavpachev MA, Popyrina TN, Grachev AV, Ivanov PL, Zelenetskii AN. Hydrophobic Modification of Chitosan via Reactive Solvent-Free Extrusion. Polymers. 2021; 13(16):2807. https://doi.org/10.3390/polym13162807

Chicago/Turabian Style

Akopova, Tatiana A., Tatiana S. Demina, Mukhamed A. Khavpachev, Tatiana N. Popyrina, Andrey V. Grachev, Pavel L. Ivanov, and Alexander N. Zelenetskii. 2021. "Hydrophobic Modification of Chitosan via Reactive Solvent-Free Extrusion" Polymers 13, no. 16: 2807. https://doi.org/10.3390/polym13162807

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