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1.
G. M. Pavlov I. I. Zaitseva A. S. Gubarev I. I. Gavrilova E. F. Panarin 《Russian Journal of Applied Chemistry》2006,79(9):1490-1493
Samples of sodium polystyrenesulfonate of molecular weights varying in a 20-fold range were synthesized. The hydrodynamic behavior of the samples was studied in a 0.2 M NaCl solution in which the initial polyelectrolyte effects are suppressed. Relationships between the molecular weight and the translational friction coefficient and intrinsic viscosity were obtained. The theory describing the hydrodynamic behavior of wormlike chains with taking into account both the percolation effects and the excluded-volume effects was applied to estimation of the length of the statistical segment and the cross section of the sodium polystyrenesulfonate molecules in 0.2 M NaCl solution. 相似文献
2.
N. P. Evlampieva A. V. Yakimanskii A. V. Dobrodumov O. V. Nazarova Yu. B. Pashkov E. F. Panarin E. I. Ryumtsev 《Russian Journal of General Chemistry》2005,75(5):751-758
A butylamine derivative of fullerene was prepared by the reaction of butylamine with fullerene C60. The experimental electrooptical and dipole characteristics of the derivative were compared with the corresponding calculated PM3 data. The reaction product proved to be inhomogeneous in the number of the amine molecules added; it contains polar multiadducts of C60 with noncentrosymmetric distribution of covalently bound amino groups over the fullerene core.__________Translated from Zhurnal Obshchei Khimii, Vol. 75, No. 5, 2005, pp. 795–802.Original Russian Text Copyright © 2005 by Evlampieva, Yakimanskii, Dobrodumov, Nazarova, Pashkov, Panarin, Ryumtsev. 相似文献
3.
E. F. Panarin V. V. Kopeikin V. M. Denisov A. I. Kol'tsov 《Russian Chemical Bulletin》1976,25(3):532-535
1. | Carbon-chain polymers with -diketone and -keto ester functional groups in the side chains have been synthesized. |
2. | The tautomeric equilibrium of the polymeric -dicarbonyl compounds polymethacryloylacetone and poly(vinyl acetoacetate) and low-molecular models of these polymers has been studied. The effect of the macromolecular nature of the polymeric -diketones on the tautomeric equilibrium is expressed as a significant difference between their thermodynamic equilibrium parameters and those of the low-molecular analog. |
4.
5.
V. D. Pautov T. N. Nekrasova T. D. Anan’eva R. T. Imanbaev M. L. Levit A. A. Nikiticheva O. V. Nazarova E. F. Panarin 《Polymer Science Series A》2013,55(3):171-176
With the use of polarized luminescence, relaxation times characterizing the intramolecular mobility of luminescent labeled copolymers of 2-deoxy-2-methacrylamido-D-glucose and unsaturated acids in solutions are determined in both nonionized and ionized states. Elements of the secondary structure typical for poly(methacrylic acid) are formed in copolymers with a high content of methacrylic acid (≥50 mol %) in their nonionized state. This structure is destroyed during ionization. Equilibrium stability constants for complexes of the copolymers with cationic surfactants are determined. Quantitative characteristics of the effects of the surfactant and copolymer structures and the ionic strength of solution on complex formation are estimated. 相似文献
6.
E. A. Sosnin V. A. Panarin V. S. Skakun A. A. Pikulev V. F. Tarasenko 《Technical Physics》2016,61(8):1209-1213
The energy redistribution in barrier-discharge Xe2 excilamp in various excitation regimes is investigated using the pressure jump method. Analytic expressions are derived for calculating power W dissipated in the excilamp discharge plasma in the form of heat and for calculating total discharge heat power PT spent on heating the excilamp. It is shown that the mechanism of the thermal energy dissipation gradually changes upon an increase in the xenon pressure in the excilamp. The conditions for generating the maximal radiation power of the excilamp are determined. It is shown that the maximum of the average radiation power is attained for an excitation pulse duration of 500 ns and the maximal pulse power is attained for a pulse duration of 100 ns. It is found that the optimal operation regime for the excilamp corresponds to the maximal values of the PT–W difference. 相似文献
7.
A. M. Bochek N. M. Zabivalova I. I. Gavrilova I. V. Gofman I. V. Abalov E. N. Popova V. E. Yudin V. K. Lavrent’ev E. F. Panarin 《Polymer Science Series A》2014,56(2):158-168
The rheological properties of dilute and moderately concentrated solutions of methyl cellulose blends with poly(N-methyl-N-vinylacetamide) in water and dimethylacetamide are studied, and the stressstrain characteristics of the composite films based on these blends are estimated. DSC, X-ray diffraction, and thermomechanical analysis are used to investigate the structural organization of composite films, to estimate the temperatures of relaxation transitions, and to determine the composition ranges in which the polymers are compatible and form mixed structures. 相似文献
8.
L. I. Kutsenko Yu. G. Santuryan E. B. Karetnikova I. V. Gofman A. M. Bochek E. F. Panarin 《Russian Journal of Applied Chemistry》2007,80(5):771-776
Rheological properties of dilute and moderately concentrated aqueous solutions of methyl cellulose-polyvinylpyrrolidone blends, as well as the conditions of gelation in them, were studied. Films were obtained from solutions of the polymer blends, and their physicomechanical properties were examined. The range of the compositions corresponding to thermodynamic compatibility of methyl cellulose with polyvinylpyrrolidone was identified by the solvent vapor sorption method and by thermomechanical examinations of the films. 相似文献
9.
N. A. Nesterova I. I. Gavrilova E. F. Panarin 《Russian Journal of Applied Chemistry》2007,80(12):2129-2131
The possibility of using horse radish peroxidase as a catalyst for polymerization of monomers (vinylformamide and sodium vinylsulfonate) in the presence of hydrogen peroxide and 2,4-pentanedione in aqueous medium at room temperature was studied. 相似文献
10.
N. P. Yevlampieva B. M. Okrugin M. L. Levit A. S. Gubarev O. V. Nazarova E. I. Ryumstev E. F. Panarin 《Polymer Science Series A》2014,56(4):414-421
Hydrodynamic properties of the homologous series of the homopolymer 2-deoxy-2-methacryla-mido-D-glucose and the copolymers of 2-deoxy-2-methacrylamido-D-glucose with unsaturated acids in 0.2 M NaCl are studied via static and dynamic light scattering, viscometry, refractometry, and translational diffusion. The copolymers synthesized via the free-radical copolymerization of 2-deoxy-2-methacrylamido-D-glucose with acrylic acid or methacrylic acid contain ~20 mol % acid units. At this amount of acid units, the equilibrium rigidity of copolymer chains corresponds to that of homopolymer chains. The copolymers are distinguished by the hydrodynamic characteristics of molecules. The copolymer with methacrylic acid is similar to the homopolymer, whereas the copolymer with acrylic acid features substantially different parameters of relationships relating the hydrodynamic characteristics of homologs to their molecular masses. 相似文献