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Invited researcher Sergey Stanislavovich Sheiko
Contract number
14.W03.31.0022
Time span of the project
2018-2020

As of 30.01.2020

40
Number of staff members
4
scientific publications
General information

h-index: 53 (Web of Science)

Leading scientist's research interests: Polymer materials, shape memory, gels and elastomers, materials with programmed characteristics, tissue and biomimetic materials, atomic force microscopy

Quote by the head of the laboratory: Our approach - «architecture design» - will significantly broaden the range of possible characteristics for biocompatible polymers.

Goals and objectives

Research directions: Synthesis and research of cross-linked polymer systems based on molecular brushes with characteristics close to biological tissues

Project objective: Developing a new platform to designing materials for programmed synthesis of elastomers precisely imitating mechanical qualities of biological tissues


The practical value of the study

  • We have synthesized a number of new macromolecular brushes: with a poly arylene main chain and poly(meth)acrylate side chains, with a oligoester main chain and polyoxazoline side chains, with a polyfluorene main chain and polyoxazoline side chains.
  • We have shown that polymer silicone elastomers with the PMMA-PDMS-PMMA (PMMA composition – polymethylmethacrylate, PDMS – polydimethylsiloxane) demonstrate strengthening when stretching strain increases in a way similar to that of live tissues. Research of cellular and biological compatibility of PMMA-PDMS-PMMA samples with living tissues has shown that they support adhesion of human dermal fibroblasts (hDF).
  • By modeling using the Scheutjens–Fleer self-consistent field method we have shown that unfolding of unimolecular micelles formed by a amphiphilic molecular brush occurs in three main stages and is accompanied by microphase division into a «head» and a «tail». In the case of molecular brushes with side chains consisting of weak polyelectrolytes these side chains separate into two groups: one of the phases is not charged and forms the dense phase of the nuclei located along the main chain, the other group forms a crown consisting of elongated charged side chains.
  • We have developed a theory describing hierarchical structure of semidilute solution and molds of macromolecular brushes that manifests itself in a specific elastic behavior of molecular brushes under strain, more precisely in sigmoid dependencies of strength of reaction on deformation. The theory allows to connect parameters of deformation curves in different concentration modes with controlled architecture of molecular brushes.

Education and career development: 3 candidate dissertations and 2 masters dissertations have been defended

Collaborations:

  • University of North Carolina at Chapel Hill (USA): joint research, development of an elasticity theory for elasticity theory of macromolecular brush solutions and melts
  • Institut des Sciences Analytiques et de Physico-Chimie pour l’Environnement et les Matériaux (France), Saint Petersburg National Research University of Information Technologies, Mechanics and Optics – ITMO (Russia): joint research, development of a theory of flat brushes containing of molecular brushes sewn to a surface

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Liang H., Morgan B.J., Xie G., Martinez M.R., Zhulina E.B., Matyjaszewski K., Sheiko S.S., Dobrynin A.V.
Universality of the Entanglement Plateau Modulus of Comb and Bottlebrush Polymer Melts. Macromolecules 51(23): 10028–10039 (2018).
Filippov A.P., Krasova A.S., Tarabukina E.B., Meleshko T.K., Yakimansky A.V., Sheiko S.S.
The Behavior of Amphiphilic Molecular Brushes with Polyimide Backbone and Poly(methyl methacrylate) and Polystyrene Side Chains in the Vicinity of Θ Point. Polymer Science, Series C 60(suppl. 1): 219–227(2018).
Nekrasova T.N., Pautov V.D., Anan’eva T.D., Meleshko T.K., Ivanov I.V., Yakimansky A.V.
Structural Organization of Interpolymer Complexes Formed by Poly(N-vinylamides) and Poly(methacrylic acid) Chains Regularly Grafted to Polyimide in Aqueous Solutions. Polymer Science, Series C 60 (suppl. 1): 172–178 (2018).
Zhulina E.B., Neelov I.M., Sheiko S.S., Borisov O.V.
Planar Brush of End-Tethered Molecular Bottle-Brushes. Scaling Mode. Polymer Science, Series C 60 (suppl. 1): 76–83 (2018).
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