ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
The applicability of peak methods of nonisothermal kinetic data analysis is considered in this paper with focus on the influence of critical temperature; cooling experiments are also discussed. The method of analysis used in the paper is based on the Johnson–Mehl–Avrami [W. A. Johnson and K. F. Mehl, Trans. AIME 135, 315 (1941) and M. Avrami, J. Chem. Phys. 7, 1103 (1939)] rate equation, combined with the modified temperature dependence of reaction rate (including critical temperature). Using this method model, temperatures corresponding to the maximum reaction rate for different cooling/heating rates were found, and the applicability of different peak methods was tested. It is concluded that only the Kissinger [J. Res. Natl. Bur. Stand. 57, 217 (1965)] method gives correct values of activation energy, and that even this method can only be applied when analyzing reactions without (or with very low) critical temperature during heating experiments.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.343835
