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Том 489, № 2 (2019)
- Год: 2019
- Статей: 4
- URL: https://journal-vniispk.ru/0012-5008/issue/view/9332
Chemistry
N-Heterocyclic Phosphorus Compounds Based on N,N '-Disubstituted 9,10-Phenanthrenediimines
Аннотация
N-Heterocyclic phospholes based on N,N '-disubstituted 9,10-phenanthrenediimines have been synthesized for the first time. Dimeric 1,3,2-diazaphospholes have been obtained by the reduction of 2-bromodiazaphospholes. In the case of the most sterically hindered phenanthrenediimine, diphosphole can dissociate into phosphorus-centered radicals at extremely low temperatures (220 K) for this class of compounds, which makes it possible to synthesize new organophosphorus and coordination compounds under mild conditions.
279-282
Migration of Carbon Nanoparticles to the Surface of a Polymer Composite Melt
Аннотация
The results of a study of migration of electrically conductive nano-sized carbon particles of different types to the surface of molten polymer composite are presented. The real-time measurements of the changes in electrical conductivity of the polymer composite melt at a constant temperature, carried out separately for the bulk and surface conductivity components, revealed the basic features of the process. The results indicate that the formation of a surface layer saturated with electrically conductive nanoparticles is a general phenomenon for composites where filler nanoparticles with different aspect ratios are used. The role of polymer macromolecules in the kinetics of migration of carbon nanoparticles to the polymer composite melt surface is discussed.
283-287
Cationic Copolymerization of Cholesterol Vinyl Ether with Methyl Vinyl Sulfide: Towards New Biologically Active Oligomers
Аннотация
288-291
Chemical Technology
Distribution of TR2O3, P2O5, and Nb2O5 between Two Immiscible Melts in the Monazite–SiO2–NaF–Nb2O5–Fe2O3 System
Аннотация
The monazite–SiO2–NaF–Nb2O5–Fe2O3 system in the isotherm at 1200°C is characterized by a wide region of two immiscible melts: a silicate melt and a phosphate–fluoride (salt) melt. The system is reciprocal; in the salt melt, new rare-earth metal (REM) phases form: binary phosphates and fluoride phosphates of REM and Na, which contain neither Fe, nor Nb. Iron has a strong effect on the immiscibility of the melts: in the absence of iron, the segregation region occupies 50% of the area of the diagram; at 5% Fe2O3, 57%; and at 10% Fe2O3, 70%. REM, P, and Nb oxides are contrastingly distributed between the immiscible melts. Most (95%) of REM and P are concentrated in the phosphate–salt melt, and Nb is concentrated in the iron–silicate melt. If the silicate melt contains no Fe2O3, then the Nb2O5 content is 4.91%; and at a Fe2O3 content of 15.33%, the Nb2O5 content is 6.89%, i.e. is 40% higher.
292-297