The PVA-Palm fiber composite polymer membranes were prepared by sol-gel
casting method with different ratios of concentration, in order to study the mechanical
properties of these composite ultrasonic measurements of variable frequencies
(25,30,35,40,45 and 50 kHz) were performed , these properties are ultrasonic velocity
,density ,compressibility ,specific acoustic impedance ,relaxation time, relaxation
amplitude , bulk modulus, shear viscosity ,absorption coefficient and transmittance. Results
shows that all these properties were decreasing with concentration of palm fiber in
composite ; so palm powder keep the degradations polymer chain isolated and their roots
not interact again to forming entanglement interactions, this reason made these vales
reduced except that scattering were dominant so we pointed that this composite more
effective to reflect and scattered ultrasonic waves.