N. P. Kuznetsova

Sorption of Noble Metal Compounds by Cross-Linked Copolymer of 1-Vinyl-1,2,4-Triazole with Acrylic Acid

Sorption properties with respect to noble metal compounds were examined for a new divinyl benzene cross-linked nitrogen-containing heterocyclic copolymer of 1-vinyl-1,2,4-triazole with acrylic acid. The sorption recovery of chloride complexes of Au(III), Pt(IV), Pd(II), and Ag(I), as well as of silver nitrate from acidic solutions was examined in relation to the nature and concentration of acids and the contact time between the phases.

Reactions of glutaraldehyde with dipolar ions of amino acids and proteins

The review covers studies of the reactions of glutaraldehyde with dipolar ions of amino acids and proteins in neutral aqueous solutions. The formation of imines and the accompanying aldol condensation of glutaraldehyde are acid-catalyzed reactions.

Modification of polyvinyl chloride with Na(K) salts of 1,2,4-triazole and 1,2,3-benzotriazole

The possibility of polyvinyl chloride modification by nucleophilic substitution of chlorine with sodium and potassium salts of 1,2,4-triazole and 1,2,3-benzotriazole in dimethylformamide at 40-80°C was examined.

Synthesis and characterization of silver polymer nanocomposites of 1-vinyl-1,2,4-triazole with acrylonitrile

Novel organic-inorganic nanocomposites were synthesized by chemical reduction of silver ions from silver acetate in DMSO and DMF solutions in the presence of the stabilizing copolymer of 1-vinyl-1,2,4-triazole-acrylonitrile. The solvents DMSO and DMF can act as efficient reducing agents for silver ions, which makes it possible to carry out the reaction under mild conditions and simplify procedures of nanocomposite isolation. The structure and properties of the starting copolymer and related nanocomposites were characterized by UV, IR, and 1H and 13C NMR spectroscopy, as well as transmission electron microscopy and thermogravimetry. The prepared polymer nanocomposites contain 6.8–7.2% silver in the form of nanoparticles with a size of 2–20 nm uniformly dispersed in the polymer matrix. The nanocomposites are readily soluble in DMSO and DMF and do not decompose on heating to 260 °C.

1-Vinyl-1,2,4-triazole in copolymerization reaction with 1-vinyl-4,5,6,7-tetrahydroindole: synthesis and properties of copolymers

A radical copolymerization of 1-vinyl-1,2,4-triazole (VTA) with 1-vinyl-4,5,6,7-tetrahy-droindole (VTHI) was studied. New thermally stable functional copolymers of different composition, well soluble in organic solvents were synthesized. It was found that VTA has higher reactivity as compared to VTHI. A new soluble polymeric nanocomposite with metallic silver nanoparticles encapsulated into the matrix of synthesized copolymer was obtained.

The Reactivity of 1-Vinyl-1,2,4-triazole in the Radical Copolymerization with Crotonic Aldehyde

Copolymerization of 1-vinyl-1,2,4-triazole with crotonic aldehyde under the conditions of free-radical initiation has been studied. 1-Vinyl-1,2,4-triazole was found to be more reactive than crotonic aldehyde. The composition and structure of copolymers were determined by the elemental analysis, IR and quantitative 13C NMR spectroscopy. New polyfunctional water-soluble copolymers possessing thermostability up to 300°C were obtained.

Sorption recovery of noble metal ions with a copolymer of 1-vinyl-1,2,4-triazole with acrylonitrile

Suspension copolymerization of 1-vinyl-1,2,4-triazole with acrylonitrile was used to synthesize an insoluble heat-resistant copolymer possessing sorption activity. An effect of the nature and concentration of acids on the recovery of noble metal ions Pt(IV), Pd(II), Au(III), and Ag(I) was observed. The kinetic and sorption characteristics of the copolymer were evaluated and the possibility of its application was assessed. IR and Raman spectroscopies were used to elucidate the mechanism of interaction of the copolymer with noble metal ions.

Silver recovery with complexing sorbents based on 1-vinyl-1,2,4-triazole

The sorption activity of copolymers based on 1-vinyl-1,2,4-triazole toward silver ions was studied in relation to the copolymer structure and to the kind and concentration of acids. The copolymers were prepared by radical copolymerization of 1-vinyl-1,2,4-triazole with 1,1,3-trihydrotetrafluoropropyl methacrylate and divinylbenzene, with 1,1,3-trihydrotetrafluoropropyl methacrylate, methyl methacrylate, and N,N′-methylenebisacrylamide, with diethylene glycol divinyl ether, and with divinyl sulfide. The copolymers exhibit high sorption activity. They efficiently recover silver cations from acid solutions and behave as anion exchangers.

New network copolymers of 1-vinyl-1,2,4-triazole as efficient sorbents of mercury

The possibility of preparing copolymers by radical copolymerization of 1-vinyl-1,2,4-triazole with divinyl sulfide and divinyl diethylene glycol ether in the bulk was examined. The sorption characteristics of the new cross-linked copolymers with respect to mercury(II) ions under static conditions in acid solutions were studied.

Modelling of gas transport function of erythrocytes in haemoglobin sorption immobilization

Colloid-disperse systems based on haemoglobin sorption immobilization in reticular polyelectrolytes are proposed and investigated. The efficiency of oxygen transport of these systems is much higher than that of native haemoglobin and is comparable with the efficacy of gas transport of erythrocytes. This is believed to be due to highly selective sorption immobilization of haemoglobin in microdisperse forms of permeable carboxylic reticular polyelectrolytes. Microparticles exhibit high local concentration of haemoglobin, the protein mass being by one order of magnitude higher than that of the polymer carrier.