FTIR and WAXS analysis of periodate oxycellulose: Evidence for a cluster mechanism of oxidation

Cellulose paper (Whatman no.1, chromatographic grade) was oxidised with 0.1 M sodium metaperiodate at different oxidation levels (0–11 days at room temperature), and analysed with FTIR before and after chemical treatments (reduction, further oxidation, alkaline hydrolysis). The deconvolution of infr...

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Bibliographic Details
Published in:Vibrational spectroscopy 2006-03, Vol.40 (2), p.177-183
Main Authors: Calvini, Paolo, Gorassini, Andrea, Luciano, Giorgio, Franceschi, Enrico
Format: Article
Language:English
Subjects:
FTIR crystallinity index
Oxycellulose
X-ray analysis
β-Alkoxy elimination
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Summary:Cellulose paper (Whatman no.1, chromatographic grade) was oxidised with 0.1 M sodium metaperiodate at different oxidation levels (0–11 days at room temperature), and analysed with FTIR before and after chemical treatments (reduction, further oxidation, alkaline hydrolysis). The deconvolution of infrared data allowed us to verify that periodate oxidises cellulose in isolated domains, leading to the decrease of crystallinity, in agreement with the results of wide angle X-ray scattering (WAXS). In particular, the alkaline hydrolysis (β-alkoxy fragmentation) followed by mild acid treatment removed the oxidised groups and recovered most of the crystallinity of cellulose, as determined by the FTIR crystallinity index.
ISSN:0924-2031
1873-3697
DOI:10.1016/j.vibspec.2005.08.004