Preparation of chloro penta amine cobalt (III) chloride and investigate its influence on the structural properties and acoustical parameters of polyvinyl alcohol

Chloro penta amine Cobalt (III) Cloride [Co(NH3)5Cl]Cl2 was prepared then characterized by FTIR and XRD . The obtained results indicated the formation of Orthorhombic [Co(NH3)5Cl]Cl2 nano particles of ≈ 28.75 nm size .Polymeric films based on polyvinyl alcohol PVA doped with Chloro penta amine Cobalt (III) Cloride [Co(NH3)5Cl]Cl2 at different weight percent ratios were prepared using the solvent cast technique. The structural properties of these polymeric films were examined by XRD, FTIR and SEM studies. The complexation of the additive with the polymer was confirmed by FTIR and SEM studies. The XRD pattern revealed that the amorphousicity of PVA polymer matrix increased with raising the [Co(NH3)5Cl]Cl2 content. Ultrasonic pulse technique of variable frequency (25, 30, 35 and 40) kHz were performed to study the influence of ultrasonic frequency on the mechanical properties of PVA / [Co(NH3)5Cl]Cl2 composite. Some properties such as ultrasonic velocity, acoustic impedance ,bulk modulus and transmittance and relaxation amplitude were found to be decreasing with frequency while absorption coefficient and compressibility were increasing with frequency .Results showed that ultrasonic wave made degradation to the randomly coiled polymer chains ,when ultrasonic frequency increase there were more degradation that increasing the number of un-tied chains as a result of absorbing composite ultrasonic waves ,for this reason it could be pointed that PVA / [Co(NH3)5Cl]Cl2 composite as a good ultrasonic absorber. It was found that there was significant relationship between ultrasonic velocity and material properties.