Hydrophobic Modification of Chitosan via Reactive Solvent-Free Extrusion

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 interact...

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Bibliographic Details
Published in:Polymers 2021-08, Vol.13 (16), p.2807
Main Authors: Akopova, Tatiana A, Demina, Tatiana S, Khavpachev, Mukhamed A, Popyrina, Tatiana N, Grachev, Andrey V, Ivanov, Pavel L, Zelenetskii, Alexander N
Format: Article
Language:English
Subjects:
3-D printers
Alkylation
Aqueous solutions
Chemical analysis
Chitosan
Composite materials
Degree of polymerization
Ethers
Extrusion
Hydrophobicity
Infrared analysis
Infrared spectroscopy
Macromolecules
Mechanical tests
Modulus of elasticity
Molecular chains
Molecular weight
Photon correlation spectroscopy
Physical properties
Polymers
Polysaccharides
Reagents
Rheological properties
Shear deformation
Solvents
Sorbents
Spectrum analysis
Twin screw extruders
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Summary: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.
ISSN:2073-4360
2073-4360
DOI:10.3390/polym13162807