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Structural changes from polyimide films to graphite: Part IV. Novax and PPT

Published online by Cambridge University Press:  03 March 2011

C. Bourgerette ,
A. Oberlin  and
M. Inagaki
C. Bourgerette
Affiliation:
Labortoire Marcel Mathieu, 2 avenue du Président P. Angot-Hélioparc, 64000-Pau, France
A. Oberlin
Affiliation:
Labortoire Marcel Mathieu, 2 avenue du Président P. Angot-Hélioparc, 64000-Pau, France
M. Inagaki
Affiliation:
Department of Applied Chemistry, Faculty of Engineering, Hokkaido University, Sapporo 060, Japan
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Abstract

Various polyimide films (Kapton, Upilex, Novax, and PPT) were carbonized and graphitized up to 3000 °C. They were studied by optical and electron microscopies. All films retaining oxygen as a cross linker over 1000 °C, i.e., Kapton, Upilex, and Novax, graphitize as anthracites (high rank coals) do. They get a long range statistical orientation parallel to the film plane with a nanotexture of flattened pores. Graphitization is both sudden and perfect above 2100 °C when the pore walls break. Since oxygen is released at 1000 °C, the film PPT behaves as a compact nonporous graphitizing carbon (orientation parallel to the film plane). Thermal graphitization is progressive and begins at a higher temperature.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 4 , April 1995 , pp. 1024 - 1027
Copyright
Copyright © Materials Research Society 1995

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References

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