Synthesis of chitosan and N-vinylimidazole graft-copolymers and the properties of their aqueous solutions

  • Andrey V. Sorokin Voronezh State University, 1 Universitetskaya pl., Voronezh 394018, Russian Federation; Voronezh State University of Engineering Technologies, 19 Prospekt Revolutsii, 394036 Voronezh, Russian Federation https://orcid.org/0000-0001-5268-9557
  • Marina G. Kholyavka Voronezh State University, 1 Universitetskaya pl., Voronezh 394018, Russian Federation; Sevastopol State University 33 Universitetskaya ul., Sevastopol 299053, Russian Federation https://orcid.org/0000-0002-1390-4119
  • Maria S. Lavlinskaya Voronezh State University of Engineering Technologies, 19 Prospekt Revolutsii, 394036 Voronezh, Russian Federation https://orcid.org/0000-0001-9058-027X
Keywords: Graft copolymers, Aqueous solutions of polymers, Stimuli sensitivity, chitosan, N -vinylimidazole

Abstract

The aim of this work is to synthesise chitosan and N-vinylimidazole graft-copolymers of various compositions and to study the properties of their aqueous solutions.
Chitosan and N-vinylimidazole graft-copolymers were obtained by solution polymerisation in the presence of a ceric ammonium nitrate redox initiator. The synthesised graft copolymers were characterised by FTIR to determine their compositions and the grafted side chains of poly-N-vinylimidazole were characterised by gel permeation chromatography to determine their molecular wights and polydispersity indices. It was established that the obtained products are characterised by high values of yield and grafting efficiency and low values of the polydispersity index. It was found that when the content of the N-vinylimidazole links is above 57 wt%, the synthesised graft copolymers are water-soluble. Aqueous solutions of the obtained copolymers were characterised using dynamic light scattering, transmission electron microscopy, and laser
Doppler microelectrophoresis. The study showed that macromolecules of graft copolymers in aqueous solutions have stimuli-sensitive properties with respect to the medium reaction and at a concentration above 10–2 wt% are characterised by a tendency to self-association forming core-crown aggregates, the geometry of which depends on the molecular masses of the grafted chains. Associates of macromolecules in solutions are characterised by positive values of the electrokinetic potential, the values of which also depend on the medium reaction. Thus, it was found that the ceric ammonium nitrate initiator allows obtaining chitosan and N-vinylimidazole graft-copolymers showing stimuli-sensitive properties in aqueous solutions and prone to self-association at concentrations above 10–2 wt%.

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Author Biographies

Andrey V. Sorokin, Voronezh State University, 1 Universitetskaya pl., Voronezh 394018, Russian Federation; Voronezh State University of Engineering Technologies, 19 Prospekt Revolutsii, 394036 Voronezh, Russian Federation

postgraduate student at the
Polymer Science and Colloid Chemistry Department,
research assistant at the Department of Biophysics
and Biotechnology, Voronezh State University;
research assistant at the Laboratory of Metagenomics
and Food Biotechnologies, Voronezh State University
of Engineering Technologies, Voronezh, Russian
Federation; e-mail: andrew.v.sorokin@gmail.com

Marina G. Kholyavka, Voronezh State University, 1 Universitetskaya pl., Voronezh 394018, Russian Federation; Sevastopol State University 33 Universitetskaya ul., Sevastopol 299053, Russian Federation

DSc in Biology, Associate Professor, Professor at the Department of Biophysics
and Biotechnology, researcher at the Department of
Biochemistry and Cell Physiology, Voronezh State
University, Voronezh, Russian Federation; Professor
at the Department of Physics; leading researcher at
the Core Research Centre “Molecular Structure of
Matter”, Sevastopol State University, Sevastopol,
Russian Federation; e-mail: holyavka@rambler.ru

Maria S. Lavlinskaya, Voronezh State University of Engineering Technologies, 19 Prospekt Revolutsii, 394036 Voronezh, Russian Federation

PhD in Chemistry, researcher
at the Department of Biophysics and Biotechnology,
Voronezh State University, Voronezh, Russian
Federation; researcher at the Laboratory of
Metagenomics and Food Biotechnologies, Voronezh
State University of Engineering Technologies,
Voronezh, Russian Federation; e-mail: maria.lavlinskaya@gmail.com

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Published
2021-11-24
How to Cite
Sorokin, A. V., Kholyavka, M. G., & Lavlinskaya, M. S. (2021). Synthesis of chitosan and N-vinylimidazole graft-copolymers and the properties of their aqueous solutions. Kondensirovannye Sredy I Mezhfaznye Granitsy = Condensed Matter and Interphases, 23(4), 570-577. https://doi.org/10.17308/kcmf.2021.23/3676
Section
Original articles