APPLICATIONS OF THERMOELECTROMETRY TO METAL-ION MODIFIED POLYIMIDE FILMS

As part of a research program to decrease the electrical resistivity of polyimide films with ionic additives, variable-temperature, three-probe, electrical-resistivity measurement system has been designed and constructed. Sample temperature, electrification time, atmosphere, and measurement mode are computer controlled. As a data interpretation aid, temperature cycled analysis can be routinely performed. Surfaces resistitivies in the range 10**3-10**1**5 ohm and volume resistivities in the range 10**5-10**1**8 ohm-cm are theoretically measurable under well-controlled experimental conditions from room temperature to 250. The electrical resistivity measurement system is useful for the evaluation of polymer films or films in general. Application of the system for analysis of cobalt, lithium and tin ion-modified polyimide films and some experimental considerations are presented. Correlation of the electrical measurements with differential scanning calorimetry, thermomechanical analysis, and thermogravimetric analysis is demonstrated. (Edited author abstact)