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Thermal degradation of cellulose and its phosphorylated products in air and nitrogen
Author(s) -
Jain Rajesh K.,
Lal Krishan,
Bhatnagar Hari L.
Publication year - 1985
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.1985.070300302
Subject(s) - cellulose , thermogravimetry , cellobiose , phosphate , nitrogen , pyrolysis , degradation (telecommunications) , decomposition , chemistry , thermal decomposition , phosphorus , thermal analysis , nuclear chemistry , materials science , inorganic chemistry , organic chemistry , thermal , cellulase , telecommunications , physics , meteorology , computer science
The thermal degradation of cellulose and its phosphorylated products (phosphates, diethylphosphate, and diphenylphosphate) were studied in air and nitrogen by differential thermal analysis and dynamic thermogravimetry from ambient temperature to 750°C. From the resulting data various thermodynamic parameters were obtained following the methods of Broido and Freeman and Carroll. The values of E a for decomposition for phosphorylated cellulose were found to be in the range 55–138 kJ mol −1 in air and 85–152 kJ mol −1 in nitrogen and depended upon the percent of phosphorus contents in the samples. The mass spectrum of cellobiose phosphate indicated the absence of the molecular ion, indicating that the compound was thermally unstable. The IR spectra of the pyrolysis residues of cellulose phosphate gave indication of formation of a compound having CO and PO groups. A fire retardancy mechanism for the thermal degradation of cellulose phosphate has been proposed.