Study of some mechanical properties of PVA/TiO 2 composite at different ultrasonic frequencies

Abstract

The PVA/TiO2 composite polymer membranes were prepared by a solGel casting method, the weight of PVA is constant (1gm) while the TiO2 powder weights were (0.01, 0.02, 0.03, 0.04, 0.05) gm, the density of the samples were measured by the weight method. In order to evaluate the mechanical properties of PVA/TiO2 composite the ultrasonic measurements were performed at the composites these properties are ultrasonic velocity, compressibility, acoustic impedance and bulk modulus at different frequencies (25,30,35,40) kHz , another acoustic mechanical properties were measured and calculated at a same time such as the ultrasonic wave amplitude before and after absorption by composite were measured using oscilloscope, then we calculated absorption coefficient and transmittance, shear viscosity , relaxation time and relaxation amplitude. It was found that there is significant relationship between ultrasonic velocity and material properties also results show that adding TiO2 effect on the absorption of the ultrasonic waves inside the composites.