Abstract
The ultrasonic speeds and densities of poly(dimethylsiloxane), viscosity grades 30 and 50×10−4 m · s−1 at 298.15 K, were measured at 298.15, 303.15, and 308.15 K. The measurements were carried out using new apparatuses, one for measurement of the speed under pressures up to 200 MPa and another for measurement of the density under pressures up to 100 MPa. The former is constructed with a sing-around technique of the fixed-path type operated at a frequency of 2 MHz, and the latter is a dynamic bellows piezometer. The probable uncertainty in the present results is within ±0.23% for speed and ±0.19% for density for all the experimental conditions. The ultrasonic speed in these fluids at first increases rapidly with pressure and then indicates a mild rise in the highpressure region. Similar pressure effects are observed for the density. The relationship between the speed and the density satisfied a first-order function well. The isentropic compressibility, derived from the speed and density, also showed a large pressure effect. The values and its pressure effects seemed almost independent of the viscosity of poly(dimethylsiloxane).
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References
M. Nakahara, N. Totok, N. Takisawa, and J. Osugi, J. Chem. Phys. 76:5154 (1982).
M. Okamoto and H. Teranishi, J. Phys. Chem. 88:5644 (1984).
T. Takagi, Rev. Phys. Chem. Jap. 48:10 (1978).
T. Takagi, J. Chem. Thermodyn. 12:277 (1980).
T. Takagi and H. Teranishi, J. Chem. Thermodyn. 14:577 (1982).
T. Takagi and H. Teranishi, J. Chem. Thermodyn. 16:1031 (1984).
T. Takagi and H. Teranishi, J. Soc. Mat. Sci. Jap. 33:134 (1984).
K. Tamura, K. Ohomura, and S. Murakami, J. Chem. Thermodyn. 15:859 (1983).
M. Bobic, J. Chem. Thermodyn. 10:1137 (1978).
M. S. Benson and J. Winnick, J. Chem. Eng. Data 16:154 (1971).
N. S. Isaacs, Liquid Phase High Pressure Chemistry (John Wiley and Sons, New York, 1981).
P. W. Bridgman, The Physics of High Pressure (G. Bell and Sons, London, 1949).
A. Weissler, J. Am. Chem. Soc. 71:93 (1949).
R. A. Fine and F. J. Millero, J. Chem. Phys. 59:5529 (1973).
G. S. Kell and E. Whalley, J. Chem. Phys. 62:3496 (1975).
T. Takagi and H. Teranishi, Fluid Phase Equil. 20:315 (1985).
H. Eyring, J. Chem. Phys. 4:283 (1936).
B. Jacobson, Acta Chem. Scand. 6:1485 (1952).
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Takagi, T., Teranishi, H. Ultrasonic speeds and densities of poly(dimethylsiloxane) (viscosity grades 30 and 50×10−4 m · s−1) at 298.15, 303.15, and 308.15 K under high pressures. Int J Thermophys 6, 451–463 (1985). https://doi.org/10.1007/BF00508890
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DOI: https://doi.org/10.1007/BF00508890