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Thermal oxidation of polyacrylonitrile

✍ Scribed by A.E. Standage; R.D. Matkowsky

Publisher: Elsevier Science
Year: 1971
Tongue: English
Weight: 434 KB
Volume: 7
Category: Article
ISSN: 0014-3057
DOI: 10.1016/0014-3057(71)90043-7

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✦ Synopsis

AbstractmThe thermal oxidation of polyacrylonitrile at temperatures between 200 ° and 375 ° has been studied. Samples produced by the heating of polyacrylonitrile fibre at various temperatures within this range, for periods of up to 5 hr, were analysed for carbon, hydrogen, nitrogen and oxygen. A continuous and simultaneous exchange of one oxygen atom for two hydrogen atoms was noted. Two distinct types of infra-red reflectance spectra, associated with different oxidation levels, are related to structural changes. Experimental thermodynamic evidence supports a structure comprising a cyclized polyaerylonitrile chain with epoxide oxygen bonding to the apex carbons of the polycyclic arrangement.

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