Ultrasonic velocity and absorption and shear viscosity measurements were made as a function of concentration and temperature for binary aqueous solutions of the polymer polyvinylpyrrolidone. The polymer has a molecular weight of 360 000 and was mixed with water in several concentrations ranging from 0% to 9% by weight. The frequency used was 21 MHz and the temperature range was 20 °C to 45 °C. The velocity shows a nonlinear increase with temperature and a nearly linear increase with concentration. The α/f  ² and viscosity values increase monotonically with concentration, and these values decrease with temperature. The temperature behavior, in a general sense, for the velocity and α/f  ² of the solution is similar to that of pure water. As the concentration increases from 0% to 9%, the viscosity increases by more than two orders of magnitude, while the α/f  ² value increases by less than one order of magnitude. No strong evidence of a critical concentration was observed.

Title

The Journal of the Acoustical Society of America 85(3):1363 · January 1989

Publisher

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Publisher Country

Palestine

Publication Type

Both (Printed and Online)

Volume

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Year

1989

Pages

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