Dielectric Properties of Epoxy/Al 2 O 3 Nanocomposites

Abstract

EP /Al2O3 nanocomposites with different weight percentage of Al2O3 nanoparticles 1, 2, 3, 4, 5, and 7%wt. of Al2O3 nanoparticles with average particle size smaller than 46.73 nm had been prepared. EP/ Al2O3 nanocomposites samples with good dispersion of nanoparticles in the epoxy matrix were prepared and experiment performed to measure the dielectric permittivity and tan delta over frequency (10 3 -10 6 ) Hz .Relative permittivity of EP/Al2O3 nanocomposites at 1wt% is lower than that of unfilled epoxy. Relative permittivity at 2, 3, and 4%wt. of Al2O3 nanoparticle increased with increasing weight percentage of Al2O3 nanoparticles respectively. At 5 and 7%wt. relative permittivity decreased again. Tan delta decrease with increasing particle contains of Al2O3 nanoparticles until reached 5%wt. tan delta begin to increase but still less than of unfilled epoxy. This surprising observation has been attributed to the interaction between epoxy chains and the nanoparticles, and in this paper this phenomena is analyzed using dual layer interface model reported for polymer nanocomposites, the nanofiller loading seems to have significant effect. Further analysis of results obtained in this paper shows that the possible of interaction between nanoparticle and epoxy chains by using Fourier Transform Spectroscopy (FTIR) .