Preparation and Properties of Conductive Polyimide Films

Carbon black and graphite granules were added to polyimide resin and the mixture was processed into films. The surface resistivity of the polyimide film can be as low as 0.1 /cm² upon the addition of these conductive granules. The effect of the content of conductive granules on the properties of polyimide, such as the conductivity, thermal stability, and the surface roughness, was studied. The results showed that smaller granule or higher content would enhance the conductivity but made the processing more difficult. The surface roughness was affected by the type of carbon black, the content, and the preparation conditions. For Pyre-ML type polyimide resin containing 9% of 975 carbon black, the thermal degradation temperature could reach as high as 610°C.