Al2o3 Composites Lab Report

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composite has been investigated. For that purpose, the PMMA samples with Al2O3 additive prepared with different percentages(0,15,25,35 and 45) wt.% and different thickness. The experimental results showed that the D.C electrical conductivity increased with increasing the alumina concentrations and temperature. Also the activation energy change with increasing of additional alumina. The dielectric constant, dielectric loss, A.C electrical conductivity are changed with change the concentration of the filler and frequency of applied electrical field.
Keywords: Composites, poly-methyl methacrylate, Electrical Properties.
Introduction
In order to fulfill the requirements of polymer industry many developers usually blend polymers together in order to reach an optimum balance of
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The oscillatory behavior of ε " may be due to some relaxation processes which usually occur in heterogeneous system. The relaxation peak at W=10MHz is appears clearly in all low Al2O3 concentration on specimens. The increasing of Al2O3 concentration increases the height of the peak and increasing its broadness for these specimens. This is due to the overlapping of relaxation process which are attributed to some structural changes that take place in the composite as result of filler addition . The increasing of the peak height of ε " with increasing Al2O3 concentration indicates the enhancement of conductivity in these specimens , i.e. enhancement of losses [Raghavendra et al,2007, Pillal,1980] .
Figure 7: Variation of dielectric loss with frequency for (PMMA-Al2O3) composite.
0
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1.E+05 1.E+06 1.E+07 1.E+08

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