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IR studies of carbons—II: The vacuum pyrolysis of cellulose

✍ Scribed by C. Morterra; M.J.D. Low

Publisher
Elsevier Science
Year
1983
Tongue
English
Weight
703 KB
Volume
21
Category
Article
ISSN
0008-6223

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✦ Synopsis

The pyrolysis of cellulose in vacuum from 22 to 765°C was followed by IR photothermal beam deflection spectroscopy. Series of spectra recorded at various stages of pyrolysis showed that although the main decomposition occurred near 3OO"C, some decomposition occurred as low as 190°C with the formation or highly absorbing aromatic systems. Mixtures of predominantly aliphatic material predominate in the 3-C range but decline in extent to be replaced by mixtures of aromatic nature above 500°C Further degassing causes discrete spectral features 10 decline and &a pear near 700°C; a continuum absorption remains. Band assignments are discussed. In particular, the 1600 cm-P band of spectra of carbons is shown by isotopic study not to be ascribed to carbonyls. but is thought to be a C-C mode made IR active by asymmetry caused by bound oxygen.

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