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31.
Viscosity of six (0.10, 0.33, 0.65, 0.97, 1.40, and 2.00) mol kg−1 binary aqueous CaCl2 solutions has been measured with a capillary-flow technique. Measurements were made at pressures up to 60 MPa. The range of temperature was from 293 to 575 K. The total uncertainty of viscosity, pressure, temperature, and composition measurements was estimated to be less than 1.6%, 0.05%, 15 mK, and 0.014%, respectively. The effect of temperature, pressure, and concentration on viscosity of binary aqueous CaCl2 solutions was studied. The measured values of viscosity of CaCl2(aq) were compared with data, predictions, and correlations reported in the literature. The temperature and pressure coefficients of viscosity of CaCl2(aq) were studied as a function of concentration and temperature. The viscosity data have been interpreted in terms of the extended Jones–Dole equation for the relative viscosity (η/η0) to accurate calculate the values of viscosity A- and B-coefficients as a function of temperature. The derived values of the viscosity B-coefficients were compared with the values calculated from the ionic B-coefficient data. The physical meaning parameters V and E in the absolute rate theory of viscosity and hydrodynamic molar volume (effective rigid molar volume of salt) Vk were calculated using present experimental viscosity data. TTG model has been used to compare predicted values of the viscosity of CaCl2(aq) solutions with experimental values at high pressures. 相似文献
32.
Kulieva I. M. Mamedov M. K. Azizov A. G. Alieva R. V. 《Russian Journal of Applied Chemistry》2010,83(7):1336-1338
The [4+2]-cycloaddition of cyclopentadiene to methacrylonitrile and addition of acrylic acids to the resulting exo-2-cyano-endo-2-methylnorborn-5-ene were studied. The possibility was explored of synthesizing cyano-containing bicyclic acrylates suitable
as reactive monomers for preparation of polymeric products. 相似文献
33.
Certain meromorphic matrix valued functions on , the so-called boundary coefficients, are characterized in terms of a standard symmetric operator S in a Pontryagin space with finite (not necessarily equal) defect numbers, a meromorphic mapping into the defect subspaces of S, and a boundary mapping for S. Under some simple assumptions the boundary coefficients also satisfy a minimality condition. It is shown that these assumptions hold if and only if for S a generalized von Neumann equality is valid. 相似文献
34.
New experimental data on the density of three
(0.2393, 0.4856 and 0.7390 mole fraction of ethylbenzene) binary n-heptane+ethylbenzene mixtures have been measured
with a constant-volume piezometer immersed in a precision liquid thermostat.
These new experimental data covering a temperature range from 306 to 527 K
and a pressure range of 0.1 to 11 MPa. The experimental data reported here
have an uncertainty less than 0.06% for the density, 0.05% for the pressure,
15 mK for the temperature, and 0.012% for the concentration. Excess molar
volumes were derived using measured values of density for the mixtures and
for the pure components calculated with reference equation of state for n-heptane (Span and Wagner, 2003) and for the pure
ethylbenzene (Frenkel et al., 2005). The
derived values of excess molar volumes at atmospheric pressure were compared
with the values reported by other authors in the literature. The effect of
pressure on the excess molar volumes was studied. 相似文献
35.
M. M. Ishanov U. A. Azizov M. S. Nigmankhodzhayeva Kh. U. Usmanov 《Journal of polymer science. Part A, Polymer chemistry》1971,9(4):1013-1025
The process of radiation-induced crosslinking of cellulose is found to be highly influenced by radiation dosage and dose as well as by the solvents used and their concentration. The best crease resistance has been obtained in cases when cellulose is crosslinked with acrolein in the vapor phase. Moreover, the process is entirely radiation-induced and practically no homopolymer is formed. Chemical analysis and investigations of infrared spectra indicate that crosslinking proceeds on vinyl as well as on aldehyde groups of acrolein. 相似文献
36.
37.
The results of the investigation of dark-current relaxation in EuGa2S4 single crystals are reported. The depth and concentration of the traps are found to be Et = 0.79 eV and Nt = 1.64 × 1014 cm?3, respectively.The charge accumulation region (dc = 3.3 × 10?5 cm) and contact capacitance (Cc = 1.23 × 10?10 F) are also estimated. 相似文献
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