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https://doi.org/10.15407/polymerj.46.01.015

SYNTHESIS OF COBALT NANOPARTICLES IN AQUEOUS

SOLUTIONS ASSISTED BY POLYMER/INORGANIC HYBRID

Nataliya PERMYAKOVA^1* (ORCID: 0000-0002-7622-1059), Tatyana ZHELTONOZHSKAYA¹ (ORCID: 0000-0001-5272-4244), Dmytro KLYMCHUK² (ORCID: 0000-0002-7076-8213), Valeriy KLEPKO¹ (ORCID: 0000-0001-8089-8305), Liudmyla GRISHCHENKO³ (ORCID: 0000-0002-0342-4859), Arina FOMENKO⁴, Liudmyla VRETIK⁴ (ORCID: 0000-0003-3456-7518)
¹Institute of Macromolecular Chemistry of the NAS of Ukraine, 48 Kharkivske highway, 02155 Kyiv, Ukraine,

²M.G. Kholodny Institute of Botany of the NAS of Ukraine, 2 Tereshchenkivska str., 01601 Kyiv, Ukraine,

³Taras Shevchenko National University of Kyiv, Faculty of Radiophysics, 4g Glushkova av., 03127 Kyiv, Ukraine,

⁴Taras Shevchenko National University of Kyiv, Faculty of Chemistry, Department of Macromolecular Chemistry, 60 Volodymyrska str., 01033 Kyiv, Ukraine,

^*e-mail: permyakova@ukr.net
Polym. J., 2024, 46, no. 1: 15-29.

Section: Structure and properties.

Language: English.

Abstract:

Hydrophilic polymer/inorganic hybrids (PIH) containing silica nanoparticles and polyacrylamide chains proved to be effective matrices for the in situ synthesis of cobalt nanoparticles. PIH sample was synthesized by free-radical polymerization of acrylamide from the unmodified surface of SiO2 nanoparticles and characterized by elemental analysis, dynamic thermogravimetric analysis, static light scattering, potentiometric titration, viscometry and transmission electron microscopy (TEM). The processes of borohydride reduction of cobalt ions from the Co(NO3)2·6H2O solution to nanoparticles in water medium and aqueous solutions of PIH were studied as a function of the concentrations of metal salt and hybrid concentrations using UV-Vis spectroscopy and TEM. A special approach to characterize the kinetics and efficiency of CoNPs formation in water medium and hybrid solutions using UV-Vis spectroscopy was implemented. The kinetic parameters of the CoNPs formation process as well as the yield, size, and morphology of nanoparticles in hybrid solutions and water medium at various concentrations of metal salt and hybrid were determined. The growth of both concentrations of reagents had a positive effect on the rate of formation of metal nanoparticles and their yield, but in all cases, the reduction process developed much slower in hybrid solutions compared to pure water. The morphology of the CoNPs/PIH nanocomposites was mainly represented by separate swollen hybrid particles containing metal nanoparticles with dav~3 nm.

Key words: polymer/inorganic hybrid, matrix, in situ synthesis, borohydride reduction, cobalt nanoparticles.

References

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https://doi.org/10.15407/polymerj.45.04.299

STUDY OF THE EFFECTIVENESS OF THE INFLUENCE OF PLASTICIZERS AND FUNCTIONAL ADDITIVES IN THE RECEIVING OF THERMOPLASTIC STARCH ON ITS FILM-FORMING AND DESTRUCTIVE PROPERTIES

T.V. Dmytrieva,
Institute of Macromolecular Chemistry NAS of Ukraine, 48, Kharkivske Shose, Kyiv, 02155, Ukraine,
ORCID: 0000-0002-3526-8395

S.K. Krymovska,
Institute of Macromolecular Chemistry NAS of Ukraine, 48, Kharkivske Shose, Kyiv, 02155, Ukraine,
ORCID: 0000-0002-9723-4633

G.E. Glieva,
Institute of Macromolecular Chemistry NAS of Ukraine, 48, Kharkivske Shose, Kyiv, 02155, Ukraine,
ORCID: 0000-0002-2916-0257

V.I. Bortnytskyi,
Institute of Macromolecular Chemistry NAS of Ukraine, 48, Kharkivske Shose, Kyiv, 02155, Ukraine,
ORCID: 0000-0003-4954-6533

S.V. Riabov,
Institute of Macromolecular Chemistry NAS of Ukraine, 48, Kharkivske Shose, Kyiv, 02155, Ukraine,
e-mail: imcnasusr@ukr.net
ORCID: 0000-0003-2996-3794

Polym. J., 2023, 45, no. 4: 299-305.

Section: Structure and properties.

Language: Ukrainian.

Abstract:

A literature review on the production of thermoplastic starch (TPS) with various plasticizing additives as a component of biodegradable polymer compositions was conducted. Plasticizing additives with different functional groups, due to which starch modification occurs, were analyzed. In order to expand the spectrum of functional additives for the formation of TPS, the introduction of acids with different amounts of carboxyl groups: citric, oxalic, oleic, stearic was studied. The technological parameters of thermomechanical processing of starch compositions and the quantitative composition of the components are determined. Physical and mechanical tests of strength and elasticity of film samples of TPS compositions and compatible with synthetic polymer were carried out. In order to obtain the structural characteristics of TPS and TPS films with polyethylene, studies were carried out by IR-Fourier spectroscopy and mass spectrometry. Studies of the effect of UV irradiation on the degradability of TPS compositions after exposure in a climate chamber for 90 days were conducted. It was found that the loss of strength and elasticity of TPS and TPS+PE film samples is (82–90)%, elasticity (60–70)%, depending on plasticizing and structure-forming additives and their amounts.

Keywords: thermoplastic starch, structure-forming additives, film formation.

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https://doi.org/10.15407/polymerj.44.04.304

THE STUDY OF INTERMOLECULAR INTERACTIONS IN THE POSS-CONTAINING NANOCOMPOSITES BASED ON POLYURETHANE AND POLYURETHANE/POLY(HYDROXYPROPYL METHACRYLATE) MATRICES

L.V. Karabanova,

Institute of Macromolecular Chemistry NAS of Ukraine, 48, Kharkivske shose, Kyiv, 02155, Ukraine,
ORCID: 0000-0002-5909-0042

L.A. Honcharova,
Institute of Macromolecular Chemistry NAS of Ukraine, 48, Kharkivske shose, Kyiv, 02155, Ukraine,
ORCID: 0000-0003-2529-9945
N.A. Busko,

Institute of macromolecular Chemistry NAS of Ukraine, 48, Kharkivske shose, Kyiv, 02155, Ukraine,

ORCID: 0000-0001-9831-6748

S.M. Ostapiuk,
Institute of macromolecular Chemistry NAS of Ukraine, 48, Kharkivske shose, Kyiv, 02155, Ukraine,
ORCID: 0000-0001-8436-9080
Polym. J., 2022, 44, no. 4: 304-315.

Section: Polymer synthesis.

Language: Ukrainian.

Abstract:

The nanocomposites based on polyurethane matrix and multicomponent polymer matrices consisting of polyurethane and poly(hydroxypropyl methacrylate) with different contents of the last, and 1,2-propanediolisobutyl polyhedral oligomeric silsesquioxane (1,2-propanediolisobutyl-POSS), which was used as a functionalized nanofiller, were synthesized. The influence of the content of 1,2-propanediolisobutyl-POSS on intermolecular interactions and structural features of the nanocomposites was investigated by the method of IR-spectroscopy with Fourier transformation and attenuated total reflection (FTIR-ATR). The study of thermal curing of the model system, which consists of the adduct of trimethylolpropane with toluene diisocyanate and 1,2-propanediolisobutyl-POSS, made it possible to conclude that 1,2-propanediolisobutyl-POSS participates in the reaction of urethane formation using of one of the terminal hydroxyl groups, and it is incorporated into the polymer chain between cross-linking of  polyurethane networks. The investigation of multicomponent polymer matrices by FTIR-ATR spectroscopy was done and was shown that photopolymerization of second polymer poly(hydroxypropyl methacrylate) in the matrix of polyurethane was completed by the opening of a double bond and the formation of a linear polymer in the composition of semi-IPN. Studies of nanocomposites based on  multicomponent polymer matrices consisting of polyurethane and poly(hydroxypropyl methacrylate) with 15 and 30 % of the last by FTIR-ATR spectroscopy demonstrated the presence of POSS in the nanocomposites and the influence of POSS content on the structure of the studied systems and on the degree of phase separation. The POSS is “embedded” into the polymer chain between cross-linking of the polyurethane networks, with the additional formation of a complex system of intermolecular hydrogen bonds between the carboxyl and amine components of urethane groups in the nanocomposites.

Key words: nanocomposites, 1,2-propanediolisobutyl-POSS, polyurethane, poly(hydroxypropyl methacrylate), semi-interpenetrating polymer networks, FTIR-ATR spectroscopy.

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