Authors:Adelia Emilia de Almeida, Ana Luiza Ribeiro Souza, Douglas Lopes Cassimiro, Maria Palmira Daflon Gremião, Clóvis Augusto Ribeiro, and Marisa Spirandeli Crespi
activation energy from dynamic data can be obtained from the Flynn–Wall–Ozawa isoconversional method [ 26 – 28 ], with Doyle’s approximation of p ( x ). The p(x) is defined by equation , temperature integral or integral of Arrhenius [ 29 ] which involves
Authors:Douglas L. Cassimiro, Clóvis A. Ribeiro, Jorge M. V. Capela, Marisa S. Crespi, and Marisa V. Capela
thermal behavior through the TG-DTA and DSC techniques and to obtain the kinetic parameters for the thermal decomposition reaction.
Kinetic parameters—non-linear isoconversional method
The kinetic parameters for the thermal
Authors:Tiit Kaljuvee, Merli Keelmann, Andres Trikkel, and Rein Kuusik
) KnowItAll search program and Gases&Vapours Database (code GS) and Organics&Polymers Database (code TU, SR) were used.
The differential isoconversional method of Friedman [ 17 ] was applied to calculate the kinetic parameters. After baseline
isoconversional method, namely, Flynn–Wall–Ozawa (F–W–O) method [ 37 , 38 ] that allows for evaluating kinetic parameters without choosing the reaction model was applied. F–W–O is a relatively simple method of determining activation energy directly from mass loss
Authors:J. M. Morancho, A. Cadenato, X. Ramis, X. Fernández-Francos, M. Flores, and J. M. Salla
10% of H40 at different heating rates. As expected, this figure shows how a decrease in the heating rate displaces the curing curves down to lower temperatures. Applying the Ozawa isoconversional method to the thermal curing of the different
Authors:F. López, M. Ramirez, J. Pons, A. López-Delgado, and F. Alguacil
This study presents an evaluation of the decomposition kinetic of low-grade nickeliferous laterite by thermogravimetric analysis.
Kinetic parameters were calculated using the Ozawa and the iso-conversional Friedman methods. Simplified kinetics models like
those based on the reaction order were also applied for the simulations. Two-dimensional shrinkage models of the reaction
interface mechanism were adopted as describing the thermal transformation process from non-isothermal kinetic analysis. The
iso-conversional method (model-free kinetics) reveals that the decomposition of low-grade nickeliferous laterite does not
follow a single mechanism because the determined activation energies and pre-exponential factor are not constant during the
course of the reaction.
In this study, the temperature-heating rate diagram of the main crystallization process of two metallic glasses, Fe74Ni3.5Mo3B16Si3.5 and Fe41Ni38Mo3B18, was obtained from one experimental differential scanning calorimetry (DSC) scan and the knowledge of their activation energy
as determined by an isoconversional method. A good concordance was observed between the diagram curves obtained by calculation
(isoconversional approach) and the experimental data, which verifies the reliability of the method and the validity of the
kinetic approach in these alloys.
Authors:P. Budrugeac, Alice Luminita Petre, and E. Segal
The validity of isoconversional methods used to evaluate the activation energy is discussed. The authors have shown that the Flynn-Wall-Ozawa and Friedman methods give results that agree with each other only if the activation energy does not change with the degree of conversion. A criterion for the reaction mechanism as expressed by the differential conversion function is suggested too.
Authors:G. Singh, P. Srivastava, and J. Srivastava
Five salts of dichloroanilinium bromide (DCABr) were prepared and characterized by elemental and spectral studies. The thermal
decomposition of DCABr was studied by using TG-DTG-DTA techniques and the results are discussed here. Kinetic parameters with
the help of model fitting and isoconversional methods have been evaluated critically. A mechanism of decomposition has also
Authors:Carmen Ramírez, M. Rico, L. Barral, J. Díez, S. García-Garabal, and B. Montero
behaviour of an epoxy resin cured with an amine-POSS was studied using differential
scanning calorimetry (DSC) and thermogravimetric (TG) analysis. The kinetic
of polymerization reaction and the thermal degradation have been analyzed
based on an iso-conversional model. The obtained results showed that the activation
energies of both processes depend on the degree of conversion.