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Thermal studies on C-6 substituted cellulose and its subsequent C-2 and C-3 esterified products in air

✍ Scribed by Rajesh K. Jain; Krishan Lal; Hari L. Bhatnagar

Publisher
Elsevier Science
Year
1986
Tongue
English
Weight
527 KB
Volume
22
Category
Article
ISSN
0014-3057

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✦ Synopsis

The thermal behaviours of cellulose and its primary and subsequently secondary substituted derivatives (viz. cellulose tosylate, cellulose tritylate and their acetates and benzoates) have been studied in air by differential thermal analysis and thermogravimetry from ambient temperature to 700'. Various reactions involved (dehydration, detosylation, detritylation, deacetylation, debenzoylation, oxidative decomposition and oxidation of charred residues) are discussed. The data obtained from thermogravimetry have been utilized to obtain various thermodynamic functions for different stages of thermal degradation using the method of Broido. The activation energies for the oxidative decomposition of cellulose and its primary and secondary substituted derivatives are found to be in the range 35-304 kJ mol-t. The i.r. spectra of the residues of modified celluloses give indication of formation of a compound containing C--C and C--O groups in the final residual char. The mechanisms involved in thermal degradation of these compounds are discussed.

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