The Piloyan activation energiesE of decomposition and the initial temperaturesTD of the exotherms of hexanitrobiphenyl (HNB), nonanitro-m-terphenyl (NONA), tripicryl-s-triazine (TPT) and 1,4,5,8-tetranitronaphthalene (TENN) have been determined by means of non-isothermal DTA. Due to its volatility in the zone of the beginning of thermal decomposition onlyTD values are specified fors-trinitrobenzene (TNB). From the values ofE ·TD−1 for HNB and from the derived values ofE ·TD−1 for TNB on the one hand, and from the published values of the Arrhenius parameters obtained by means of the manometric method on the other, relationships have been derived. The relationship betweenE ·TD−1and the standard activation enthropy is considered relevant.
assumptions. Moreover, we will provide some piece of advice to manipulate experimental data to apply isoconversional methods properly.
Non-constancy of the activationenergy
Originally isoconversional methods were based on the
been used widely to estimate the kinetic parameters of degradation processes, such as activationenergies ( E ), reaction order ( n ), and the Arrhenius pre-exponential factor ( A ) [ 17 – 19 ], which can be calculated using various kinetic models such
Authors:C. U. Aniz, P. P. Robinson, K. K. Abdul Rashid, and T. D. Radhakrishnan Nair
kinetically treated as a gas–solid reaction to study the reduction behavior using model based and model-free methods. In model based methods, a single run data is used to calculate the Arrhenius activationenergy values whereas model-free methods involve
Authors:F. M. Aquino, D. M. A. Melo, R. C. Santiago, M. A. F. Melo, A. E. Martinelli, J. C. O. Freitas, and L. C. B. Araújo
The objective of this study is to study the thermal degradation of the ligand groups with the metallic ions of the system using the Flynn and Wall and “Model-free kinetics” methods and evaluate the results in order to establish the activationenergy as
(activationenergy, pre-exponential factor, and conversion function) of each degradation step is one important target of kinetic investigations. Many kinetic analysis methods have been developed, among which isoconversional methods have been widely used [ 1