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1.
2.
The one-pot, three-step, four-component Ugi-IMDAF reaction with 5-hydroxymethylfurfural provides simple access to hydroxymethyl-substituted epoxyisoindolones in a diastereoselective and stereospecific manner. The protocol avoids the transfer or isolation of isocyanides, and the broad scope was illustrated by the synthesis of 22 different compounds bearing various substituents on the heterocyclic core. 相似文献
3.
V. V. Lemanov V. K. Yarmarkin V. M. Egorov G. A. Pankova N. V. Zaitseva L. A. Markova 《Physics of the Solid State》2012,54(2):346-349
It has been shown that the phase transitions observed at temperatures of about 250 K in crystals of protein amino acids and
of their compounds grown from water solutions are related to drops of these solutions trapped by crystals in their growth. 相似文献
4.
L. V. Zhoga A. V. Shil'nikov V. V. Shpeizman G. G. Pankova 《Russian Physics Journal》2004,47(2):172-174
The electrical durability (time since the application of a constant voltage up to the breakdown) as a function of the electric field strength E and the breakdown field intensity E
br as a function of the rate of rise of the electric field strength E are measured on ferroelectric-piezoceramic disks. It is concluded that the destruction of ferroelectric-piezoceramics has a kinetic character. 相似文献
5.
The temperature dependence of the piezoelectric response of many protein amino acids and their compounds exhibits a sharp
increase in the piezoelectric response signals at a certain temperature. It has been shown using the example of the known
ferroelectrics without a piezoelectric effect in the paraphase (triglycine sulfate, glycine phosphite, trisarcosine calcium
chloride) that such an increase in the piezoelectric response is associated with the structural phase transition to the low-symmetry
piezoelectric phase with a large number of piezoelectric coefficients. The specific features of the phase transitions with
the symmetry change D
2-C
2 have been discussed. 相似文献
6.
Vadim Baigildin Galina Pankova Tatyana Evseeva Nikolay Lavrov Irina Shirokova Gleb Vaganov 《Journal of Dispersion Science and Technology》2017,38(11):1570-1577
The present article investigates the influence of dispersion medium on the aggregate stability of cross-linked poly-(methyl methacrylate) particles on the surface layer of which aliphatic amino groups are localized. It is shown that particle size depends on the ionic strength of dispersion medium. The research determines the optimal content of cross-linked agent, ethylene glycol dimetharylate that results in the formation of cationic particles being stable in saline. Particle modification is performed by bovine serum albumin and luminophore fluorescein 5(6)-isothiocyanate. Protein sorption is observed not to influence luminescent properties of the particles. It is also determined that due to the aggregate stability of particles obtained from 5?wt% of ethylene glycol dimethacrylate in saline, the monodispersity and the absence of inversion of zeta potential in wide pH range is retained, such particles may be considered as perspective carriers of biologically active substances. 相似文献
7.
Natalia Shevchenko Galina Pankova Boris Shabsels Vadim Baigildin Alexander Khoshkin Timofei Ukleev 《Journal of Dispersion Science and Technology》2019,40(6):802-810
Monodisperse dye-containing crosslinked particles are promising for application in novel optical chemical sensors due to their intrinsic sensitivity. However, preparation of these particles in aqueous media still remains a challenge, since luminophores inhibit radical processes or else cannot embed into polymer chains because of difference in monomer reactivity ratios. In this work, novel dye-containing monodisperse crosslinked particles were prepared and characterized. In order to obtain dye-containing monodisperse crosslinked particles, we studied seed copolymerization of styrene in the presence of divinylbenzene. The influence of nature and concentration of the used comonomers and co-solvents on shape, size distributions and surface characteristics of the particles formed was investigated. Shapes and diameters of the particles were analyzed by DLS, TEM and SEM. The data of SEM and optical spectroscopy studies demonstrated that the synthesized particles were able to self-assemble into thin-film three-dimensional ordered structures. Finally, the structures under study are promising for development of sensor devices with optical response to acetone. 相似文献
8.
V. P. Stavrov V. V. Stavrov N. V. Pankova K. Friedrich 《Mechanics of Composite Materials》2000,36(2):155-162
The influence of displacements of tensioned fibers on the impregnation of fibrous layers with a polymer melt and on the final
composite structure is studied. Using computer simulation, it is shown that, during impregnation, the structure of tensioned
fibrous layers changes considerably depending on the initial arrangement and tensioning of fibers. The consolidated regions
formed under the melt front move inside the impregnated layer with the advancing melt front. Displacement of the tensioned
fibers as well as the formation of “washouts” favors the impregnation of internal layers, but cause significant inhomogeneity
of the polymer structure. The surface (on the side of the melt flow) regions are more saturated with the polymer than the
internal ones. A difference in the melt percolation mechanisms at various impregnation regimes is revealed. The effective
permeability coefficients of a tensioned fiber layer are not constant but depend on the conditions and regimes of impregnation.
Submitted to the 11th Conference on the Mechanics of Composite Materials (Riga, June 11–15, 2000).
Translated from Mekhanika Kompozitnykh Materialov, Vol. 36, No. 2, pp. 259–270, March–April, 2000. 相似文献
9.
Alexey L. Iordanskii Anatoliy A. Ol'khov Yulia N. Pankova Anton P. Bonartsev Garina A. Bonartseva Vladimir O. Popov 《Macromolecular Symposia》2006,233(1):108-116
We have integrated scientific research of polymer blends on the base of poly-3-hydroxybutyrate (PHB and its copolymers) with bench testing in blend preparation by both solvent casting and melt extrusion. As a second component, we have used traditional synthetic macromolecules with various hydrophilicity degree and hence with different morphologies and physical behavior. Besides, variation of polymer hydrophilicity permits to control both the service characteristic and the rate of (bio)degradation operating in the presence of water. Therefore, a substantial part of our work is devoted to water transport in the parent PHB and its blends. Combining the morphology knowledge (SEM, WAXS, FTIR tecynique), transport characteristics (permeability cells and McBain spring microbalance), and mechanical testing, we propose that blending of the parent biodegradable polymer with synthetic macromolecules is a perspective tool to design novel materials with improved characteristics. Both the water transport coefficients and the mechanical characteristics are essentially sensitive to structure and morphology of the blends. Hydrophilicity variation in the order LDPE < SPEU < PVA at blending with PHB shows that the morphology transformation in immicsible or partly miscible blends shifted along the PHB concentration scale as LDPE (at ∼16 wt% PHB) < PVA (∼30 wt% PHB) < SPEU (∼50 wt% PHB) Our instrumental monitoring the structural hierarchy of parent polymers and their blends as well as , simultaneously, the study of transport processes, their modeling, and computer simulating open up the way to understanding the precepts of polymer operation in corrosive and bioactive media. 相似文献
10.
A. M. Syroezhko Ya. I. Pankova S. N. Korchemkin N. N. Otchayannyi V. A. Proskuryakov 《Russian Journal of Applied Chemistry》2005,78(5):834-838
The source of raw materials for manufacturing softeners for rubber is extended through applying a nonwaste process of thermal dissolution of ordinary or enriched shale in crude producer-gas tar. The resulting products are less expensive than the conventional high-melting oil asphalts and oils.__________Translated from Zhurnal Prikladnoi Khimii, Vol. 78, No. 5, 2005, pp. 851–855.Original Russian Text Copyright © 2005 by Syroezhko, Pankova, Korchemkin, Otchayannyi, Proskuryakov. 相似文献