Authors:J. Santos, M. Conceiçăo, M. Trindade, A. Araújo, V. Fernandes, and A. Souza
The lanthanidic complexes of general formula Ln(C11H19O2)3 were synthesized and characterized by elementary analysis, infrared absorption espectroscopy, thermogravimetry (TG) and differential
scanning calorimetry (DSC). The reaction of thermal decomposition of complexes has been studied by non-isothermal and isothermal
TG. The thermal decomposition reaction of complexes began in the solid phase for Tb(thd)3, Tm(thd)3 and Yb(thd)3 and in the liquid phase for Er(thd)3 and Lu(thd)3, as it was observed by TG/DTG/DSC superimposed curves. The kinetic model that best adjusted the experimental isothermal thermogravimetric
data was the R1 model. Through the Ozawa method it was possible to find coherent results in the kinetic parameters and according
to the activation energy the following stability order was obtained: Tb(thd)3>Lu(thd)3>Yb(thd)3>Tm(thd)3>Er(thd)3
Authors:J. Rocco, J. Lima, A. Frutuoso, K. Iha, M. Ionashiro, J. Matos, and M. Suárez-Iha
The thermal decomposition of ammonium perchlorate (AP)/hydroxyl-terminated-polybutadiene (HTPB), the AP/HTPB solid propellant,
was studied at different heating rates in dynamic nitrogen atmosphere. The exothermic reaction kinetics was studied by differential
scanning calorimetry (DSC) in non-isothermal conditions. The Arrhenius parameters were estimated according to the Ozawa method.
The calculated activation energy was 134.5 kJ mol-1, the pre-exponential factor, A, was 2.04×1010 min-1 and the reaction order for the global composite decomposition was estimated in 0.7 by the kinetic Shimadzu software based
on the Ozawa method. The Kissinger method for obtaining the activation energy value was also used for comparison. These results
are discussed here.
-exponential factor, A , and the mechanism functions, f (α), of MgC 2 O 4 ·2H 2 O were obtained by analyzing the TG-DTG curves of their thermal decomposition using the Popescu and Flynn–Wall–Ozawamethod [ 11 ]. Furthermore, the decomposed products, e.g., oxide or
The urethane forming cure reactions of hydroxyl terminated polybutadiene (HTPB) binder with three different isocyanate curatives,
viz., toluene diisocyanate (TDI), isophorone diisocyanate (IPDI) and 4,4'-methylene bis(cyclohexyl isocyanate) (MCHI), were
investigated by differential scanning calorimetry (DSC). The effect of two cure catalysts, viz., dibutyl tin dilaurate (DBTDL)
and ferrric tris-acetylacetonate (FeAA) on the cure reactions was also studied. Cure kinetics was evaluated using the multiple
heating rate Ozawa method. The reactivities of the three isocyanates and catalytic efficiencies were compared based on the
DSC reaction temperatures, activation energies and rate constants. Viscosity build-up in these systems at isothermal temperature
was also studied and compared with the results from DSC.
Authors:C. Păcurariu, R. I. Lazău, I. Lazău, D. Tiţa, and A. Dumitrel
regardless of the method used confirming the complex mechanism of the hematite crystallization process in the aventurine glaze.
The Avrami exponent values, calculated by Ozawamethod, also confirm the
Authors:U. Basuli, T. K. Chaki, D. K. Setua, and S. Chattopadhyay
average of three values. The conversion values 5, 8, 11, 14, 17, and 20% have been used to derive the E a using the Flynn–Wall–Ozawamethod.
Limited information can be obtained especially about the chemistry of the decomposition by TG
Authors:Mourad Ibrahim Daoudi, Abdelhafid Triki, and Abdelkrim Redjaimia
activation energy as a function of transformed fraction is obtained by means of KAS and Friedman isoconversional methods.
The variation of the growth exponent is obtained using Ozawamethod.
The following conclusions can be drawn:
Authors:Qinghong Kong, Yuan Hu, Lei Song, and Yuwen Tang
/ATH/Fe-OMT nanocomposites using different kinetic models including Kissinger, Friedman, and Flynn–Wall–Ozawamethods. The kinetic parameters obtained by the above different methods were then compared and meanwhile were connected with the flame-retardancy of the related