Study the Rheological and Mechanical Properties of PVA/NH4Cl by Ultrasonic

Abstract

Some of physical properties of polyvinyl alcohol dissolves in distilled water had been studied at different concentration (0.25%, 0.5%, 0.75%, 1.0%, and 1.25%) before and after adding 1gm from NH₄Cl for all concentrations, the Rheological properties such as shear viscosity, relative viscosity and reduced viscosity are measured and after that the ultrasonic velocity had been measured by ultrasonic waves system at frequency 40 KHz, other mechanical properties had been calculated such as absorption coefficient of ultrasonic waves, relaxation time, relaxation amplitude, specific acoustic impedance, compressibility and bulk modules. Another acoustic mechanical properties were measured and calculated at a same time such as the ultrasonic wave amplitude before and after absorption by solution were showed on oscilloscope ,then we calculated absorption coefficient. The results show that all these properties are increasing with the increase of the polymer concentration except velocity is decreasing with increase the concentration; results also show that when adding NH₄Cl these properties are increasing.

Keywords: PVA solution, mechanical properties, rheological properties, ultrasound technique.