Abstract
A method of measurement is described and the results of measurement of the modulus limit shear compliance J∞, of four samples of synthetic oil with different molecular weight compared. Oil properties have been measured acoustically by determining the characteristic shear resistance at a stress frequency of 30 MHz and 450 MHz and in the temperature range from 0°C to –100°C. It was found that the increase of molecular weight has only little influence on the limit of the modulus of shear compliance of the liquid.References
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[2] J. D. FERRY, Viscoelasticity of polymers, WNT, Warszawa 1965 [in Polish].
[3] K. OSAKI, Viscoelastic properties of dilute polymer solution, Advances in Polymer Science, 12, 1-64 (1973).
[4] R. PŁOWIEC, On the possibility of ultrasonic investigations of viscoelastic properties of liquids [in Polish], Polimery, 2, 27-72 (1967).
[5] J. WEHR, Measurements of the velocity and attenuation of ultrasonic waves [in Polish], PWN, Warszawa 1972.
