The article presents the results of the synthesis and study of the structureof metal-polymer complexes based on polyethylene (propylene) glycol maleinates with acrylic acid and metals p-EGM:AA/Ag, p-EGM:AA/Ni, p-EGM:AA/Ag-Ni, p-PGM:AA/Ag, p-PGM:AA/Ni, p-PGM:AA/Ag-Ni using microscopy, spectroscopy and thermogravimetry methods. Theresulting nanocomposites contain isolated Ag0nanoparticles with a diameter of 60 ± 10 nm, predominantly spherical in shape and metallic Ni0, 70 ± 10 nm in size, cubic in shape, uniformly distributed in the polymer matrix, agglomerates on the surface of the polymer matrix in the range of 150–200 nm. The synthesized nanocomposites have thermal stability up to ~900 ºС. Theauthorshavestudiedthe antimicrobial activity of the p-PGM/AA-Ag metal-polymer complex, which showed high efficiency against standard strains of Pseudomonas aeruginosa, Escherichia coli, and Staphylococcus aureus.
Introduction. With the development of the chemical industry, the search for and synthesis of new, and modification of the existing nanocatalytic systems are of great importance. In view of this, the preparation of new catalysts by immobilization of transition metal metals in a polymer matrix becomes an important direction in chemical synthesis. Purpose of this work is to submit experimental data on the synthesis and study of the catalytic properties of silver and nickel nanostructures, immobilized in polymer matrices, based on a binary system of unsaturated polyester – polyethylene glycol maleate – with acrylic acid. Nanocomposites have been obtained by reducing a solution of nickel and silver metal salts with sodium hypophosphite in the presence of an ammonia solution of silver chloride. Methodology. By the methods of spectroscopy, microscopy the sizes, structure and morphology of polymer-stabilized nanoparticles are determined. Results. The obtained nanocomposites contain isolated Ag0 nanoparticles with a diameter of 60±10 nm, predominantly spherical in shape and metallic Ni0 with a cubic shape of 70±10 nm, uniformly distributed in the polymer matrix, as well as agglomerates on the surface of the polymer matrix, the dimensions of which vary within 150–200 nm. The catalytic activity of the synthesized nanocomposites, which show high efficiency in comparison with the standard metal catalysts, has been also studied.
Thermal performance of copolymer based on polyethylene glycol fumarate and methacrylic acid in a dynamic mode, in an inert nitrogen environment are considered in the present work. Kinetic evaluation of thermal decomposition process was conducted using three different data processing methods (Friedman, Ozawa-Flynn-Wall, Kissinger-Akahira-Sunose). Utilizing a mixed-method approach kinetic triplets Eа, A, g(a) were received. The received kinetic parameters were used to calculate the thermodynamic characteristics of Gibbs energy (∆G), enthalpy (∆H) and entropy of activation (∆S). Copolymer thermal gravimetric analysis (TGA) and differential thermogravimetric analysis (DTA) curves were studied under nitrogen environment using a heating rate of 2,5, 5, 10 or 20°C/min. The method of Invariant Kinetic Parameters was used to identify the reaction model and pre-exponential factor. The main phase of copolymer decomposition was set, which occurred within a narrow temperature interval and is evidenced by the spike on the differential curve. Values for 13 reaction models were received. Utilised methods resulted in a proper energy activation alignment within 223-229 kJ mol-1. Design and experimental data provided close values. TGA and DTA curve analysis has shown a sufficient thermal stability of these copolymers under the nitrogen environment.
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