Oleksiy Kolendo




Oleksiy Kolendo

POSITION
Head of macromolecular chemistry Department

WORK EXPERIENCE
1981-1987
Chemical Engineer
Taras Shevchenko National University of Kyiv, Kyiv (Ukraine)

1986-1989
Post-graduate student
Taras Shevchenko National University of Kyiv, Kyiv (Ukraine)

1988-1994
Assistant Professor
Taras Shevchenko National University of Kyiv, Kyiv (Ukraine)

1994-2002
Docent
Taras Shevchenko National University of Kyiv, Kyiv (Ukraine)

2002-2003
Professor
Taras Shevchenko National University of Kyiv, Kyiv (Ukraine)

2003-2017
Head of macromolecular Chemistry department
Taras Shevchenko National University of Kyiv, Kyiv (Ukraine)

EDUCATION AND TRAINING

Design new multifunctional polymers and nanosystems for innovation technologies

Research Fields:
Chemistry

Previous and Current Research

Main field of research

  • Multifunctional polymers

Other fields

  • Photochemical modification of polymer surfaces
  • Quantum chemical calculation
  • Polymeric biocides

Current research interest

  • New photo switchable polymer materials with chromophore in side chain
  • Photochromic materials for microelectronics as switching elements, high-density data storage and nonlinear optics
  • Photo and thermal stabilization of polymers

Group leader: Prof., Dr. Chem. Sci. Oleksiy Kolendo

Switchable polymers for optical applications (O. Krupka, V. Smokal, O. Kharchenko)

Our group is interested in synthesis and characterization of photoactive polymers. Our activities are on new photo switchable polymer materials with chromophore in side chain; developing new polymer systems with different structures of photoactive fragments.

Photochemical properties of such polymers can be advantageous addressed for photonics and nonlinear optics. In addition, the spatial organization of the active side chain residues along the polymeric backbone is of critical importance regarding mechanical and structural properties of the material. This allows by an optical control to give rise to encoded images at the nanoscale.


Fig 1. Second harmonic generation image after recording (a)- erasing (b)- writing (c) on the coumarin-polymer film.

New method of optical storage based on the reversible photo switchable process of side chain polymer films, enables highly efficient optical data storage, opening promising perspectives in the important and sensitive field of hidden 3D data storage,(in collaboration with Angers University, Laboratory MOLTECH-Anjou, UMR CNRS 6200, Angers).


We have shown the potentiality of modified DNA for holographic recordings « Nature Photonics », Research Highlights, DNA stripes, 2, 6-7, (2008) 5-year Impact Factor: 34.159

Thermostabilization of polystyrene (N. Yukhimenko, V. Ovdenko)

Our group is interested in investigation of thermal stabilization effect of covalently introduced additives on polystyrene decomposition. Some of the investigated additives are shown not almost not effect on polystyrene thermal stability and others are inhibitors and retarders of polystyrene decomposition as well as in air or in inert atmosphere; some of them are polystyrene antioxidants.

It is ascertained that additives practically not effect on the molecular weight and chain-length distribution of polystyrene. Isomerism of monomer additive (meta- or para-derivative) practically is shown not effect on thermal stability of modified polystyrene. It is shown that the optimal concentration of additives introducing for polystyrene that stabilized polystyrene at it thermal decomposition on air is revealed to be near 5 % mol but in inert atmosphere is near 1 % mol.

It is shown that the mechanically mixed additives with polystyrene practically not reveal the thermal stabilizing effect to polystyrene and on the initial stages of decomposition even somewhat deteriorate the polymer thermostability.

The possible mechanism of the effect of introduced additives on the decomposition of polystyrene in inert atmosphere is suggested and recommendations about practical application of some discovered effective thermal stabilizers for polystyrene are submitted.

Functionalized photoactive polymers (V. Ovdenko, D. Vyshnevsky)

Interest of our group is mainly focused on synthesis and characterization of photoactive monomers and radical polymerization initiators with two active photochromic groups.

Our team is working on the two different research directions. The first one is dedicated to design, synthesis, characterization and spectroscopic analysis of photoactive polymers for applications in organic electronics. And the second one is connected with the synthesis and characterization of new types of initiators for photo- and thermally initiated radical polymerization.

Photoactive materials based on the azobenzene and azomethine chromophore have significant potential for holographic applications, nonlinear optics, and et. Increasing the number of photochromic groups in the monomer molecule will lead to improvement photo-switchable properties of the polymer materials and composites.

Cleavage of initiator molecule at the first stage of radical polymerization generally leads to formation of two radical centers with the same structure hence with the same reactivity. In the case of polyfunctional initiators many radical centers with different reactivity formed and it significantly affects on polymerization process and, as a result, on characteristics of obtained polymer products.

Methodological and Technical Expertise

  • Quantum chemical calculations
  • Chemical modeling of polymers
  • All experimental approaches for characterization of polymers: self-exclusion chromatography, thermogravimetric analysis, differential scanning calorimetry, viscometry, atom-force microscopy etc.

Selected Publications

O. Kharchenko, V. Smokal, . Krupka, A. Kolendo
Design, Synthesis, and Photochemistry of Styrylquinoline
Containing Polymers. Mol. Cryst. Lyq. Cryst., – Vol. 640, 2016, P. 71-77.

H. El Ouazzani, K. Iliopoulos, M. Pranaitis, O. Krupka, V. Smokal, A. Kolendo, B. Sahraoui
Second- and third-order nonlinearities of novel push-pull azobenzene polymers
J. Phys. Chem. B 115, (2011), 1944-1949. (IF 3.14 WS 10/2016: 43 citations)

I. Papagiannouli, K. Iliopoulos, D.Gindre, B. Sahraoui, O. Krupka, V. Smokal, A. Kolendo
Third-order nonlinear optical response of push pull azobenzene polymershem.
Phys. Lett., 544, (2012), 107-112. (IF 1.86, WS 10/2016: 46 citations)

V. Smokal, O. Krupka, A. Kolendo
Synthesis of photoactive styrylquinoline containing polymers
In book “Nanoconposites, Nanophotonics, Nanobiotechnology, and Applications”, Springer proceedings in Physics, Editor: Olena Fesenko, Leonid Yatsenko, Springer International Publishing Switzerland ISBN: 978-3-319-06610-3.- 2015.- P.486-500.

V. Smokal, O. Krupka, A. Kolendo
Modification and bio-testing of polyethylene films
Materialwissenschaft und Werkstofftechnikvol. 42, 2, (2011), 147-150. (IF 0.50)

V. Smokal, A. Kolendo, O. Krupka, B. Derkowska, R. Czaplicki, B. Sahraoui
Nonlinear optical properties of thiazolidine derivatives
Optical Materials. 31, (2009), 554-557. (IF 2.18)

V. Smokal, R. Czaplicki, B. Derkowska, O. Krupka, A. Kolendo, B. Sahraoui.
Synthesis and study of nonlinear optical properties of oxazolone containing polymers.
Synthetic metals, 157, (2007), 708-712. (IF 2.25)

V. Smokal, A. Kolendo, O. Krupka, B. Derkowska, R. Czaplicki, B. Sahraoui
New methacrylic oxazolone and thiozolidone containing monomers for nonlinear optical application
Mol. Cryst. Lyq. Cryst., 485, (2008), 269-276. (IF 0.491)

Y. Karabets, A. Kolendo, O. Demchenko, N. Iukhymenko, A. Byeda
Synthesis and investigation of bromine containing oxy- and propionoxy-phenylimides for polymers thermostabilization.
Molecular Crystals and Liquid Crystals, 640:1, (2016). 54-58

Karabets, Yu., Kolendo, A., Demchenko, O., Iukhymenko, N.
Brominating of oxyphenylimides for enhancement of stabilizing properties of their derivatives.
Molecular Crystals and Liquid Crystals, 590 (1), (2014), 90-96.

Yuriy Karabets, Alexey Kolendo, Olga Demchenko, Alexander Byeda, Boris Mischanchuk
Thermal decomposition of the bromine containing oxyphenylimides.
French-Ukrainian Journal of Chemistry, V.1, (2013), 125-128

Nestorak, I., Kolendo, A., Demchenko, O., Iukhymenko, N., Byeda, A., Mischanchuk, B.
Investigation of inhibiting action mechanism of succinimidophenylmethacrylate derivatives prepared by the diels-alder reaction on polystyrene decomposition.
Molecular Crystals and Liquid Crystals, 536, (2011), 208-214.

Contacts

Homepage: http://macrochem.univ.kiev.ua/pages/history/history.html


akolendo@ukr.net