Abstract
The acoustic absorption has been measured in the ♯200 series of silicones (linear polysiloxanes) over the frequency range 30–350 MHz, and the temperature range −30° to +30°C. The results are compared to measurements of dynamic viscosity made in the same fluids by Barlow, Harrison, and Lamb in approximately the same experimental region. It is found that a knowledge of the dynamic viscosity enables one to predict, quite precisely, the value of the acoustic absorption coefficient. The negligible volume viscosity and surprisingly low values of acoustic absorption and dynamic viscosity in this experimental range are discussed in terms of the theories of Rouse and Zimm for polymeric liquids of very long chain length.
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