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Carbonization and graphitization of polyimide film “Novax”

✍ Scribed by Michio Inagaki; Li-Jun Meng; Tsutomu Ibuki; Mototsugu Sakai; Yoshihiro Hishiyama

Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
444 KB
Volume
29
Category
Article
ISSN
0008-6223

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✦ Synopsis

Abst~et-Polyimide

films "Novax" consisting of the imide part with the bridging part of a random mixture of two different structures, were carbonized at various temperatures up to 1100°C and graphitized at 3000°C. The weight change occurred in two steps, as other polyimide films; large weight decrease in a narrow temperature range between 450" and 600°C. and a further decrease above 800°C. The former weight decrease could be explained by the evolution of large amount of CO and CO2 gases, and the latter corresponded to the evolution of N, gas and rapid increase in electrical conductivity up to 2fX) S/cm. The thinnest film gave a graphite film with a high degree of graphiti~ation, high value of magnetoresistance. and very low anisotropy ratios.

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