Preparation PVA/TiO2 composite and study some acoustic properties by ultrasound

Abstract

The PVA/TiO₂ composite polymer membranes were prepared by a sol-Gel casting method, the weight of PVA is constant (1gm) while the TiO₂ powder ratios were (0.01, 0.02, 0.03, 0.04, 0.05) gm. In order to evaluate the mechanical properties of PVA/TiO₂ composite the ultrasonic measurements were performed at the samples , these properties are ultrasonic velocity, compressibility, acoustic impedance, relaxation time, bulk modulus, shear viscosity and density were analyzed 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 showed on oscilloscope ,then we calculated absorption coefficient and transmittance. It was found that the frequency effect on the ultrasonic velocity except the first concentration (1gmPVA) stay constant and the material properties also shows that (20 KHz) frequency has the best results for other frequencies under search, results also shows that adding TiO₂ enhances PVA polymer and the composite became good membrane foe reflecting ultrasound waves.

Keywords: composite polymer; ultrasound technique; mechanical properties; sol-gel method.