Journal
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
Volume 67, Issue 1, Pages 1-9Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0165-2370(02)00010-4
Keywords
reaction order; polyethylene; kinetics; thermal degradation; thermogravimetric
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In the present work it is shown that random scission degradation does not follow rigorously first-order kinetics. A relation for determining reaction order was therefore established to avoid blind use of first-order reaction model. Reaction order of the dynamic degradation of a high-density polyethylene was thus determined to be 0.55. Isothermal degradation of the polyethylene was found to have the same reaction order. Furthermore, it is observed that the mean value of activation energies, estimated by the isoconversional method, of the dynamic degradation was similar to the value of the isothermal degradation. (C) 2002 Elsevier Science B.V. All rights reserved.
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