OPTICAL STUDIES OF PYROLYZED POLYACRYLONITRILE.

T. C. Chung, Y. Schlesinger, S. Etemad, A. G. MacDiarmid, A. J. Heeger

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Abstract

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 and of the duration of pyrolysis. At the temperature below 200 degree 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 semiconductor with a delocalized pi -electron system and an energy gap near to 2. 5 ev. For temperature above 260 degree 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 C equals C minus C conjugation sequences, but appears to be a complex structure consisting of a mixture of different chemical species.

Original languageEnglish (US)
Pages (from-to)1239-1246
Number of pages8
JournalJournal of polymer science. Part A-2, Polymer physics
Volume22
Issue number7
StatePublished - Jul 1 1984

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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    Chung, T. C., Schlesinger, Y., Etemad, S., MacDiarmid, A. G., & Heeger, A. J. (1984). OPTICAL STUDIES OF PYROLYZED POLYACRYLONITRILE. Journal of polymer science. Part A-2, Polymer physics, 22(7), 1239-1246.