STRUCTURE AND ELECTRICAL AND MAGNETIC-PROPERTIES OF POLYIMIDE FILMS PYROLYZED AT HIGH-TEMPERATURE

Authors
Citation
Mx. Wan et al., STRUCTURE AND ELECTRICAL AND MAGNETIC-PROPERTIES OF POLYIMIDE FILMS PYROLYZED AT HIGH-TEMPERATURE, Journal of applied polymer science, 61(5), 1996, pp. 793-798
Citations number
9
Categorie Soggetti
Polymer Sciences
ISSN journal
00218995
Volume
61
Issue
5
Year of publication
1996
Pages
793 - 798
Database
ISI
SICI code
0021-8995(1996)61:5<793:SAEAMO>2.0.ZU;2-G
Abstract
Insulator-to-metal transition of polyimide films can be performed by p yrolysis at high temperature as proposed by the authors. The maximum c onductivity of the polyimide pyrolyzed at 950 degrees C for 0.5 h in a nitrogen atmosphere was measured to be 248 S/cm. The structure, elect rical, and magnetic properties of the pyrolyzed polyimide depend on th e pyrolytic conditions, such as pyrolytic temperature and time. The py rolysis process consists of carbonization and graphitization processes , and a distinguishable pyrolytic temperature between them was estimat ed to be about 700 degrees C. In the carbonization process, an increas e in conductivity with the pyrolytic temperature may be due to the for mation of localized charge carriers. In the graphitization process, on the other hand, it is suggested that the delocalization of charge car riers is responsible for the high conductivity observed from pyrolytic temperature higher than 700 degrees C. (C) 1996 John Wiley & Sons, In c.