Abstract
Polyimide film “Kapton” C 22H 10O 5N 2 has been known to give well-oriented graphite film by high temperature heat treatment. Its carbonization behavior was followed as a function of carbonization temperature up to 1000°C. Carbon films without any appreciable deformation and cracks were obtained by carbonization up to 1000°C in between two alumina plates, though it showed large weight loss up to 40 wt% and also large shrinkage up to 23%. Carbonization proceeded in two steps; in the first step, an abrupt release of oxygen associated with remarkable weight loss and shrinkage occurred over a rather narrow temperature range of 550–650°C and in the second, nitrogen and the remaining oxygen were released gradually above 700°C. In the second carbonization step, a rapid increase of electrical conductivity, reaching about 65 S/cm after 1000°C and growth of carbon layers were observed.
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