Polyaniline were polymerized from anihne by oxidation polymerization and emulsion polymerization. The effect of conditions, such usage of DBSA on the solubility of as solvent, synthetic method, conductive state, reaction temperature and polyaniline were studied. The results showed that NMP is the best solvent of polyaniline. The polyaniline synthesized by emulsion polymerization showed much higher solubility in organic solvents than those synthesized by chemical oxidation polymerization. When DBSA/An (mole ratio)was 2.0:1 and the reaction temper...