抄録
Electrical conduction in polyimide films was measured at high temperatures under various kinds of atmospheres. Currents were measured for a long time with a very low frequency voltage of 0.001Hz in the temperature range of 160-220°C. The current measured in an atmosphere of oxygen reveals a smaller value than that in a vacuum. On the contrary, in the atmosphere of argon gas or nitrogen gas, the larger current was observed than that in the vacuum. Besides, a good re- producibility was observed in the phenomena. While the activation energies evaluated from the results measured in argon and nitrogen gases show the same magnitude as in the vacuum, the energy evaluated from the results measured in the oxygen gas shows the smaller value. The pressure dependence that the current observed in the argon gas is approximately proportional to the square root of the pressure might suggest a possibility of the relationship between the production of hydrogen gas due to the dissociation of molecules and the ionic conduction observed.
