Complex permittivity and conductivity of poly(p-phenylenediazomethine) and its blends at microwave frequencies

Poly(p-phenylenediazomethine) was synthesized by the condensation reaction between glyoxal and p-phenylene diamine in different solvents like methanol, toluene, m-cresol and N,N-dimethylformamide. The dielectric properties and microwave conductivity of the pelletized samples were measured using cavity perturbation technique. The measurements were done at 2.17 GHz at room temperature (25A degrees C). The effect of dopants on the dielectric properties and conductivity was studied using HCl and HClO(4). Dielectric properties like dielectric constant, dielectric loss factor and microwave conductivity increased on doping with HCl and HClO(4). Conducting polymer composites were prepared by in situ polymerization of glyoxal and p-phenylenediamine in different solvents containing different amounts of PVC, and silica. The microwave conductivity and complex permittivity of each sample was measured. The effect of dopants like HClO(4) and HCl on these dielectric properties was also studied. The d.c. conductivity of the pressed samples measured by the two-probe method was also studied.