Ultrasonic velocity and absorption measurements for poly(acrylic acid) and water solutions

Abstract

The ultrasonic velocity and absorption at 21 MHz and the shear viscosity were measured for poly(acrylic acid) and water solutions, as a function of concentration and temperature. The concentrations used were 1, 3, 5, 9% by weight and the temperatures were 25 °, 30 °, 35 °, 40 °, 45 °C. It was found that the velocity increases with the concentration and temperature. The absorption α/f2 decreased with increasing temperature and increased with increasing concentration. The shear viscosity decreased with temperature and increased with concentration.