STRUCTURAL-CHANGES FROM POLYIMIDE FILMS TO GRAPHITE .4. NOVAX AND PPT

Citation
C. Bourgerette et al., STRUCTURAL-CHANGES FROM POLYIMIDE FILMS TO GRAPHITE .4. NOVAX AND PPT, Journal of materials research, 10(4), 1995, pp. 1024-1027
Citations number
12
Categorie Soggetti
Material Science
ISSN journal
08842914
Volume
10
Issue
4
Year of publication
1995
Pages
1024 - 1027
Database
ISI
SICI code
0884-2914(1995)10:4<1024:SFPFTG>2.0.ZU;2-S
Abstract
Various polyimide films (Kapton, Upilex, Novax, and PPT) were carboniz ed and graphitized up to 3000 degrees C. They were studied by optical and electron microscopies. All films retaining oxygen as a cross linke r over 1000 degrees C, i.e., Kapton, Upilex, and Novax, graphitize as anthracites (high rank coals) do. They get a long range statistical or ientation parallel to the film plane with a nanotexture of flattened p ores. Graphitization is both sudden and perfect above 2100 degrees C w hen the pore walls break. Since oxygen is released at 1000 degrees C, the film PPT behaves as a compact nonporous graphitizing carbon (orien tation parallel to the film plane). Thermal graphitization is progress ive and begins at a higher temperature.