A dodedyl benzene sulfonic acid doped polyaniline was synthesized and cast into films. Water and ethanol were used as the main diffusional probes to study this polymer from 25 degrees C to 45 degrees C. Sorption of water in this polymer was found to be almost independent of temperature, but sorption of ethanol in the same polymer decreased mostly with increasing temperature. Water diffusion was non-Fickian, but ethanol diffusion was Fickian. Probably some rearrangement of polymer structure happened at temperatures between 40 degrees C) and 45 degrees C as detected by two-stage sorption of water at 40 degrees C and an abrupt increase in ethanol diffusivity from 40 degrees C to 45 degrees C. l-Propanol diffusion at 32.5 degrees C was also performed and also found to be Fickian, but the rate of diffusion was slower than that of ethanol. The sorbed amount of solvent in this polymer had the order( l-propanol > ethanol > water) owing to the most hydrophobic structure of this polymer.