Synthesis and Dielectric Properties of FeCl3/Conjugated Ploy Schiff Base Composite

The conjugated Poly Schiff base (CPSB) was synthesized through condensation reaction between glutaraldehyde and p-phenylenediamine, then cross-linked with melamine to build a three-dimensional network structure, which was further doped with Fe3+ to form FeCl3/CPSB composite with urchin-like structure. Meanwhile, the conductivity (sigma), the real and imaginary parts of permittivity (epsilon', epsilon '') and the dielectric loss tangent value (tan delta(epsilon)) occurred a significant increase and the Cole-Cole semicircle start from scratch, through comparing the initial and after 6 months value of CPSB with 0.02, 0.03, 0.04 mol Fe3+ doping content. The result displayed that epsilon '' was changed from a negative value to a positive value in 3.664x10(6)similar to 1.000x10(7) Hz after six months. Wherein, tan delta(epsilon) of composite with 0.04 mol Fe3+ doping content was increased from 0.02 to 6.13 and sigma was increased from 7.15x10(-7) S.cm(-1) to 2.19x10(-5) S.cm(-1) in 10(2) Hz. The epsilon' and epsilon '' were increased significantly as well. There are double relaxation mechanisms contributing the Debye relaxation to enhanced dielectric properties of the FeCl3/ CPBS composite.