Abstract
A critical study of the use of isoconversional methods for the kinetic analysis of non-isothermal data corresponding to processes with either a real or an apparent variation of the activation energy, E, with the reacted fraction, α, has been carried out using for the first time simulated curves. It has been shown that the activation energies obtained from model-free methods are independent of the heating rate. However, the activation energy shows a very strong dependence of the range of heating rates used for simulating the curves if the apparent change of E with α is caused by overlapping processes with different individual activation energies. This criterion perhaps could be used for determining if a real dependence between E and α is really occurring.
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M. A. Gabal, D. Hoff and G. Kasper, J. Therm. Anal. Cal., 89 (2007) 109.
S. J. García, A. Serra, X. Ramis and J. Suay, J. Therm. Anal. Cal., 89 (2007) 223.
A. Cadenato, J. M. Morancho, X. Fernández-Franco, J. M. Salla and X. Ramis, J. Therm. Anal. Cal., 89 (2007) 233.
Z. Hong-Kun, T. Cao, Z. Dao-Sen, X. Wen-Lin, W. Ya-Quong and Q. Qi-Shu, J. Therm. Anal. Cal., 89 (2007) 531.
L. Feher, B. Jurconi, G. Vlase, T. Vlase and N. Doca, J. Therm. Anal. Cal., 88 (2007) 621.
M. V. Kök, J. Therm. Anal. Cal., 88 (2007) 663.
P. Budrugeac and E. Segal, J. Therm. Anal. Cal., 88 (2007) 703.
A. Biedunkievicz, N. Gordon, J. Straszko and S. Tamir, J. Therm. Anal. Cal., 88 (2007) 717.
C. J. Pérez, V. A. Alvarez, P. M. Steffani and A. Vazquez, J. Therm. Anal. Cal., 88 (2007) 825.
J. M. Criado, F. González and J. Morales, Thermochim. Acta, 12 (1975) 337.
J. M. Criado and J. Morales, Thermochim. Acta, 16 (1976) 382.
J. M. Criado and J. Morales, Thermochim. Acta, 19 (1977) 305.
J. M. Criado, R. Garcia-Rojas and J. Morales, Thermochim. Acta, 25 (1978) 257.
J. M. Criado, Thermochim. Acta, 24 (1978) 186.
J. M. Criado, Thermochim. Acta, 28 (1979) 307.
J. M. Criado and J. Morales, Thermochim. Acta, 41 (1980) 125.
J. M. Criado, D. Dollimore and G. R. Heal, Thermochim. Acta, 54 (1982) 159.
J. M. Criado and A. Ortega, J. Thermal Anal., 29 (1984) 1225.
J. M. Criado and A. Ortega, J. Non-Cryst. Solids, 87 (1986) 302.
J. M. Criado and A. Ortega, Acta Metall., 35 (1987) 1715.
J. M. Criado, A. Ortega and F. Gotor, Thermochim. Acta, 157 (1990) 171.
A. Ortega, L. A. Pérez-Maqueda and J. M. Criado, Thermochim. Acta, 239 (1994) 171.
J. M. Criado, L. A. Pérez-Maqueda and A. Ortega, J. Thermal Anal., 41 (1994) 1535.
A. Ortega, L. A. Pérez-Maqueda and J. M. Criado, J. Thermal. Anal., 42 (1994) 551.
L. A. Pérez-Maqueda, A. Ortega and J. M. Criado, Thermochim. Acta, 277 (1996) 165.
F. J. Gotor, J. M. Criado and J. Malek, J. Am. Ceram. Soc., 84 (2001) 1797.
L. A. Pérez-Maqueda, J. M. Criado, F. J. Gotor and J. Malek, J. Phys. Chem. A, 106 (2002) 2862.
J. M. Criado, L. A. Pérez-Maqueda, F. J. Gotor, J. Malek and N. Koga, J. Therm. Anal. Cal., 72 (2003) 901.
J. M. Criado and L. A. Pérez-Maqueda, J. Therm. Anal. Cal., 80 (2005) 27.
L. A. Pérez-Maqueda, J. M. Criado and P. E. Sánchez-Jiménez, J. Phys. Chem. A, 110 (2006) 12456.
S. Vyazovkin and W. Linert, Intern. J. Chem. Kinetics, 27 (1995) 597.
S. Vyazovkin, Intern. J. Chem. Kinetics, 28 (1996) 95.
S. Vyazovkin and D. Dollimore, J. Chem. Inf. Comput. Sci., 36 (1996) 42.
S. Vyazovkin and C. A. Wight, J. Phys. Chem. A, 101 (1997) 8279.
S. Vyazovkin, Int. Rev. Phys. Chem., 19 (2000) 45.
S. Vyazovkin, New J. Chem., 24 (2000) 913.
S. Vyazovkin, J. Compt. Chem., 22 (2001) 178.
H. Chen, N. Liu and W. Fang, Polym. Degrad. Stab., 91 (2006) 1726.
T. Vlase, G. Vlase, N. Birta and N. Doca, J. Therm. Anal. Cal., 88 (2007) 631.
C. R. Li and T. B. Tang, J. Mater. Sci., 34 (1999) 3467.
G. Munteanu, P. Budrugeac, L. Ilieva, T. Tabakova and D. Andreeva, J. Mater. Sci., 38 (2003) 1995.
P. Budrugeac and E. Segal, Thermochim. Acta, 260 (1995) 75.
A. Khawam and D. R. Flanagan, Thermochim. Acta, 429 (2005) 93.
A. Khawam and D. R. Flanagan, Thermochim. Acta, 436 (2005) 101.
A. A. Joraid, Thermochim. Acta, 456 (2007) 1.
D. Silva, J. C. M. Bordado and J. M. Martín-Martinez, J. Appl. Polym. Sci., 104 (2007) 1049.
T. Vlase, G. Vlase and N. Doca, J. Therm. Anal. Cal., 80 (2005) 425.
H. Friedman, J. Polym. Sci. C, 6 (1963) 183.
T. Ozawa, Bull. Chem. Soc. Jpn., 38 (1965) 1881.
C. D. Doyle, J. Appl. Polym. Sci., 6 (1962) 639.
A. K. Galwey, Thermochim. Acta, 397 (2003) 249.
A. K. Galwey, J. Therm. Anal. Cal., 86 (2006) 267.
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Criado, J.M., Sánchez-Jiménez, P.E. & Pérez-Maqueda, L.A. Critical study of the isoconversional methods of kinetic analysis. J Therm Anal Calorim 92, 199–203 (2008). https://doi.org/10.1007/s10973-007-8763-7
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DOI: https://doi.org/10.1007/s10973-007-8763-7