at 55 u00b0 c the mixture was poured into 75 ml methanol the yellow orange precipitate which formed was collected by filtration and washed repeatedly with portions of methanol and diethylether to yield 0 58 g yellow orange powder pellets for electrical conductivity testing were prepared by adding a measured amount of the polymer powder to a beckman ir pellet press the pellets were 1 3 cm in diameter with a thickness determined by the amount of material pressed and the pressure used to obtain reliable conductivity data which could be duplicated it was found necessary to dry the material thoroughly in vacuum accordingly after being pressed all pellets were dried at 25 u00b0 to 100 u00b0 c at 0 2 mm hg for several hours pellets normally were removed and stored under nitrogen until testing iodine doping was carried out by adding an iodine crystal to a chamber containing a pellet of polymer the chamber then was evacuated causing immediate sublimation of iodine gaseous iodine remained in contact with a pellet for a period from about 1 5 to about 17 hours whereupon the doped pellet was removed and stored under nitrogen until being tested doping of a polymer with sodium naphthalide may be accomplished by contacting the polymer powder with a slurry of sodium naphthalide in dry tetrahydrofuran after the mixture is stirred under nitrogen for 24 hours excess sodium naphthalide and solvent may be removed with a pipette the remaining solvent.