ISSN:
0025-116X
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
The kinetics of the pyrolysis of cellulose and its derivatives (2,2-dichloropropionate and acetate) in nitrogen and air were studied by dynamic thermogravimetry and differential thermal analysis from ambient temperature to 600°C. From the resulting data various thermodynamic parameters could be obtained following the methods of Freeman and Carroll, Broido, and Dave and Chopra. The values of ΔE* for cellulose and its derivatives were found to be in the range 120 to 260 kJ · mol-1. However, the values of the free energy of activation for the degradation of cellulose and its derivatives are almost the same, i. e. 187 to 199 kJ · mol-1, indicating that the basic steps for the thermal degradation of cellulose and its derivatives are the same. Based on Scotney's work on the thermal degradation of cellulose triacetate, a mechanism for the thermal degradation of cellulose 2,2-dichloropropionate is proposed. The IR spectra of the pyrolysis residues of cellulose dichloropropionate indicate that dehydration takes place and a compound containing carbonyl groups is formed.
Additional Material:
7 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/macp.1982.021831215
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