The radical copolymerization of poly(ethylene glycol maleate) with acrylamide was performed for the fi rst time to obtain 3D cross-linked polymers. The infl uence of temperature, pH of the medium, and organic solvents on the behavior of the synthesized copolymers was studied. The possibility of obtaining nickel nanoparticles in the bulk of the polymer gel for pyridine hydrogenation was demonstrated.Active progress of basic research in the fi eld of radical copolymerization, allowing control of the properties, structure, and molecular mass of the copolymers and the reaction rate, makes it topical to search for new monomers for preparing polymers with a wide spectrum of valuable properties.Unsaturated polyester resins are of much interest from this viewpoint. They readily copolymerize with vinyl monomers. Copolymerization of unsaturated polyester resins was considered for the fi rst time by Boenig [1].The capability of polyester resins to copolymerize with vinyl monomers, e.g., with styrene, was discovered in the middle of the XX century [2].Unsaturated polyester resins based on maleates and fumarates, cured with vinyl monomers, exhibit specifi c physicochemical and physicomechanical properties [1][2][3][4]. Therefore, the production of decorative fi nishing materials and structural items from polyester-styrene copolymers is being actively developed today.Copolymerization of unsaturated polyester resins with acrylates has been studied previously [5][6][7], but data on the related reactions with acrylamide are lacking.The latest studies on copolymerization of unsaturated polyester resins were published in the 1980s. They mainly deal with the development of new formulations for preparing structural materials based on styrene and acrylates. On the other hand, 3D cross-linked copolymers based on unsaturated polyester resins can be highly effective polymeric supports for nanocatalysts based on transition metals. Such compounds are stable and prevent metal particles from aggregation and oxidation for a long time [8].Here we report on a first study of the radical copolymerization of poly(ethylene glycol maleate) with acrylamide in solution to obtain 3D cross-linked polymers and consider the possibility of using these polymers as matrices for preparing catalysts based on nickel nanoparticles.
EXPERIMENTALPoly(ethylene glycol maleate) (p-EGM) was prepared by polycondensation of maleic anhydride with ethylene glycol according to the standard procedure [9]. The reaction progress was monitored by determining the acid number and the volume of the released water.The molecular mass (MM) of p-EGM (2350 amu on the average) was determined by the methods of light scattering with a 2100 AN nephelometer (NACH) and of gel permeation chromatography with an Agilent 1260 Infi nity device.
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.
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