رسائل ماجيستير
English
2014
Study the Effect of MgO on the Electrical and Optical Properties of (PVA-PEG)
بهاء حسين ربيع , نغم عادل هادي البوعيسى
كلية التربية للعلوم الصرفة-جامعة بابل · العراق
Nanocomposites of (PVA-PEG-MgO) have been prepared by adding magnesium oxide nanoparticles (MgO) to the mixture of the poly vinyl alcohol (PVA) and poly ethylene glycol (PEG) with different weight percentages (0, 4, 8, 12 and 16) wt.% by using casting method and then the electrical and optical properties have been studied.
The results of the study of the effect of adding MgO on the electrical properties D.C show that the D.C electrical resistance for (PVA-PEG-MgO) nanocomposites have negative thermal coefficient, in which the increase of the temperature leads to decrease the electrical resistance.
The D.C electrical conductivity for the nanocomposites increases with the increasing of the concentration of additive nanoparticles and temperature.
The activation energy decreases for all nanocomposites with increasing the concentration of additive MgO nanoparticles.
The A.C electrical properties show that the dielectric constant and dielectric loss of the nanocomposites decrease with increasing of the frequency of applied electrical field and dielectric loss increases with the increasing of the concentration of the additive.
The A.C electrical conductivity increases with increasing of the frequency and the concentration of MgO nanoparticles.
The effect of addition MgO on the optical properties of the mixture of the PVA and PEG have been studied. The absorbance has been recorded in the wavelength (200–1100) nm, also transmittance, the absorption coefficient, energy gap, extinction coefficient, refractive index and dielectric constant (real, imaginary) have been determined.
Results showed that transmittance and the energy gap decrease with increasing of MgO concentration, also absorption coefficient, extinction coefficient, refractive index and dielectric constant (real, imaginary) all of these increase with increasing of MgO concentration. The results obtained have been analyzed, discussed, and compared with the results of researches and studies available and published.