Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104;
Optical studies of pyrolyzed polyacrylonitrile
Article first published online: 11 MAR 2003
Copyright © 1984 John Wiley & Sons, Inc.
Journal of Polymer Science: Polymer Physics Edition
Volume 22, Issue 7, pages 1239–1246, July 1984
How to Cite
Chung, T.-C., Schlesinger, Y., Etemad, S., Macdiarmid, A. G. and Heeger, A. J. (1984), Optical studies of pyrolyzed polyacrylonitrile. J. Polym. Sci. Polym. Phys. Ed., 22: 1239–1246. doi: 10.1002/pol.1984.180220708
- Issue published online: 11 MAR 2003
- Article first published online: 11 MAR 2003
- Manuscript Accepted: 13 FEB 1984
- Manuscript Received: 20 OCT 1983
The results of measurements of the optical absorption spectra, IR absorption spectra, thermogravimetric analysis, and elementary analysis of pyrolyzed polyacrilonitrile are presented as a function of the pyrolysis temperature Tp and of the duration of pyrolysis. At Tp ∼ 200°C, an intermediate phase was discovered, containing conjugated CN sequences and a completely unreacted carbon backbone. The optical absorption data imply that the resulting polymer is a semiconductor with a delocalized π-electron system and an energy gap Eg ⋍ 2.5 eV. For Tp > 260°C, the weight loss rapidly increases, and the absorption edge gradually broadens and shifts to lower energies. The resulting polymer (after higher-temperature pyrolysis) contains CN and CCC conjugation sequences, but appears to be a complex structure consisting of a mixture of different chemical species.