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Spectroscopic analysis of Fraké treated with periodic acid. I. Electron spectroscopy for chemical analysis (ESCA)
Author(s) -
Noah Joseph N.,
Prud'Homme Robert E.
Publication year - 1994
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1994.070530606
Subject(s) - carbon fibers , chemistry , spectral line , crystallography , spectroscopy , stereochemistry , medicinal chemistry , materials science , composite number , physics , composite material , quantum mechanics , astronomy
Fraké, a tropical wood species from Cameroon, was reacted with 1% periodic acid solution at room temperature for 24 h. Untreated and treated woods were analyzed by ESCA. As expected, O 1 s and C 2 s were the predominant species in the spectra. While the O 1 s peak is featureless, the C 1 s peak can be decomposed into several components. These contributions were calculated, and it was observed that untreated and treated woods exhibit carbon atoms in classes C 1 (carbon atoms bonded by a CC or a CH bond), C 2 (carbon atoms bonded by a CO bond), and C 3 (carbon atoms bonded by a CO or by a OCO bond). Class C 4 , which refers to carbon atoms bonded by OCO bonds, is completely absent. The periodic acid treatment produces a reduction in C 1 , an increase in C 2 , with C 3 remaining relatively small. Accordingly, the expected oxidation of hydroxyl groups to carbonyl groups is not observed. It can be postulated that wood–periodic acid intermediates, which are believed to be cyclic periodic esters, do not decompose to form carbonyl groups but rather remain as stable complexes. © 1994 John Wiley & Sons, Inc.