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Structural Study Of Rheological And Mechanical Properties Of Polyvinyl Alcohol By Ultrasonic | ||
| Journal of University of Babylon | ||
| Article 1, Volume 21, Issue 3, 2013, Pages 968-977 | ||
| Authors | ||
| Abdul Kareem J. Al-Bermany; Rawaa Mizher Obiad | ||
| Abstract | ||
| Some of physical properties of polyvinyl alcohol dissolves in distilled water had been studied. These properties are classified of two kinds, first Rheological properties such as shear viscosity, relative viscosity, reduced viscosity, intrinsic viscosity, average viscosity molecular weight, effective molecular radius and density . Second mechanical properties, such as ultrasonic velocity had been measured by ultrasonic waves system of frequency 21 KHz, other properties had been calculated such as absorption coefficient of ultrasonic waves, relaxation time, relaxation amplitude, specific acoustic impedance, compressibility and bulk modules .The results show that all these properties are increasing with the increase of the polymer concentration except velocity is decreasing with increase the concentration since adding more PVA lead to solvation sheeths, and increase the size of molecules then reduces velocity. Results also show that there is good agreement between experimental and theoretical values. | ||
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