Kissinger method

This process was applied to the experimental data and the resulting kinetic parameters are summarized in Table 4.2. 

Equation 4.6 can then be obtained by taking the logarithm of Eq. (4.5) and then deriving with respect to 1/T  

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The two most popular methods of calculation of energy of activation will be presented in this chapter. First, the Kissinger method [165] is based on differential scanning calorimetry (DSC) analysis of decomposition or formation processes and related to these reactions endo- or exothermic peak positions are connected with heating rate. The second method is based on Arrhenius equation and determination of formation or decomposition rate from kinetic curves obtained at various temperatures. The critical point in this method is a selection of correct model to estimate the rate of reaction. 

Kissinger method was used to calculate the activation energies and the preexponential factors. 

Sometimes the popular Kissinger method [15] is erroneously classified as an isoconversional method. The confusion appears to stem fi om the fact that the basic equation of die method ... 

The Kissinger method can also be used to determine the activation energy for viscous flow, by replacing the exothermic peak maximum temperature with the glass transformation temperature in equation 12.8. This method is particularly useful for glasses where it is difficult to form the sample needed for application of the beam-bending or fiber elongation methods discussed in Chapter 6. 

The Oauw a ircalmenl (69) it also applicable to dcfivalivc curvet and b similar to the Kissinger method. In/In ploned against l/r andlhc slope ofihisplal bagaio... 

Figure 4.4 Determination of from Kissinger method (experimental data and fitted straight line) [12]. (With permission from Elsevier.)...

A = quantity of heat (meal) corresponding to the area under DSC curve ((mcal/s) s). By the Kissinger method (Boudart), one can determine the activation energy (E) via DSC curves obtained under three different heating rates (P) at least. Once the rates (P) are known, as well as temperatures corresponding to the maximum on each peak (Tc), it is possible to establish the following linear relationship ... 

Table 1.2 Apparent activation energy (E ) obtained with the Kissinger method ...

The non-isothermal crystallization activation energy can be derived by the combination of cooling rate and exothermic peak temperature (Tp), shown as the Kissinger method [22] in Equation (6). 

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