In order to improve the processibility of Polyaniline(PANI) and to give an electrical property to Poly(bisphenol A carbonate)(PC), PANI-PC composites were prepared using an emulsion polymerization. Polymerization of aniline was carried out by introducing an aqueous solution with oxidant (ammonium persulfate) into the chloroform solution with aniline, PC and dodecylbenzene sulfonic acid (DBSA). In the emulsion polymerization, DBSA was used simultaneously as both surfactant and dopant. Composite characterization was made using in-situ conductivity measurement, FT-IR, SEM, TGA and DSC. Tensile properties were also measured. PANI-PC composites exhibited a percolation threshold at about 13wt% with electrical conductivities of the order of $10^{-2}S/cm$. The low percolation threshold of the composites is attributed to the formation of a network structure, which was observed by SEM. There has been hydrogen bonding between PANI and PC observed from the result of FT-IR. As the PANI content of the composites increased, glass transition temperature (Tg) of the composites increased. There was a variation of electrical conductivity around Tg of the composites, which might be due to the change of the electric conduction path. Tensile strength of the composites decreased with PANI content but increased over percolation threshold. The tensile modulus of the composites increased with PANI content.
