Kissinger kinetic analysis of data obtained under different heating schedules

Jiménez, Pilar; Criado, J. M.; Pérez‐Maqueda, Luis A.

doi:10.1007/s10973-008-9200-2

Cited by 98 publications

(47 citation statements)

References 40 publications

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“…Thus, when the reaction rate increases, the heating rate automatically decreases, providing a better resolving power for overlapping events. [43][44][45] It should be noted that neither SIA nor HiRes techniques allow cooling. Heptyl) phthalate) and DOTP (Dioctyl Terephthalate).…”

Section: Introductionmentioning

confidence: 99%

Quantitative Characterization of Multicomponent Polymers by Sample-Controlled Thermal Analysis

Jiménez¹,

Pérez‐Maqueda²,

Amorós³

et al. 2010

Anal. Chem.

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This paper explores the potential of Sample Controlled Thermal Analysis (SCTA) in order to perform compositional analysis of multicomponent polymeric materials by means of thermogravimetric experiments. In SCTA experiments, the response of the sample to the temperature determines the evolution of the temperature by means of a feedback system, thus, what is controlled is not the temperature-time profile as in conventional analysis, but rather the evolution of the reaction rate with time. The higher resolving power provided by the technique has been used for determining the composition of polymer blends composed of polyvinyl chloride (PVC) and different commercial plasticizers, a system where the individual components have very similar thermal stabilities, thereby rendering useless thermogravimetric experiments run under conventional conditions. Different SCTA procedures such as Constant Rate Thermal Analysis (CRTA), which has received special attention, Hi-Res and Stepwise Isothermal Analysis have been tested and the results obtained have been compared with linear heating rate technique. It has been proven that CRTA can be used to effectively determine the exact composition of the blend.

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Section: Introductionmentioning

confidence: 99%

Quantitative Characterization of Multicomponent Polymers by Sample-Controlled Thermal Analysis

Jiménez¹,

Pérez‐Maqueda²,

Amorós³

et al. 2010

Anal. Chem.

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“…Hay autores que han puesto en duda la validez del mismo pues no es claramente un método isoconversional. Sin embargo, estudios recientes han puesto de manifiesto que en un calentamiento lineal, los valores de α máximo son dependientes del modelo, pero prácticamente independientes de la velocidad de calentamiento, por lo que para efectos prácticos es un procedimiento isoconversional (Sánchez-Jiménez et al, 2008). Los valores obtenidos de E y constante A, se muestran en la Tabla 2.…”

Section: Resultados Y Discusiónunclassified

Estudio cinético de las reacciones de recocido en aleaciones de Cu-Ni-Fe

Donoso¹

2014

REVMETAL

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RESUMEN:Mediante Calorimetría Diferencial de Barrido (DSC) y medidas de microdureza Vickers se ha estudiado el comportamiento durante el recocido de las aleaciones Cu-45Ni-4Fe, Cu-34Ni-11Fe y Cu-33Ni-22Fe templadas desde 1173 K. El análisis de las curvas DSC, desde temperatura ambiente hasta los 950 K, muestran la presencia de una reacción exotérmica asociada a la formación de la fase FeNi 3 que nuclea a partir de una estructura modulada, y una reacción endotérmica que correspondería a la disolución de esta fase. Los paráme-tros cinéticos se calcularon a partir de la ecuación usual de Avrami-Erofeev, Kissinger modificado y funciones cinéticas integradas. Medidas de microdureza Vickers corroboraron la formación y disolución de fase FeNi 3 . PALABRAS CLAVES: ABSTRACT: Kinetic study of the annealing reactions in Cu-Ni-Fe alloys.The thermal aging of a Cu-45Ni-4Fe, Cu-34Ni-11Fe and Cu-33Ni-22Fe alloys tempered from 1173 K have been studied from Differential Scanning Calorimetry (DSC) and microhardness measurements. The analysis of DSC curves, from room temperature to 950 K, shows the presence of one exothermic reaction associated to the formation of FeNi 3 phase nucleating from a modulate structure, and one endothermic peak attributed to dissolution of this phase. Kinetic parameters were obtained using the usual Avrami-Erofeev equation, modified Kissinger method and integrated kinetic functions. Microhardness measurements confirmed the formation and dissolution of the FeNi 3 phase.

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“…Derivative thermogravimetric (DTG) curves were obtained by differentiating TG curves. The Kissinger method [30][31][32][33][34] was used to calculate the apparent activation energy E k and the pre-exponential factor A k . Moreover, DSC was performed to confirm the thermal behavior during reaction of oxidation process.…”

Section: Tg-dscmentioning

confidence: 99%

Thermal behavior and microcharacterization analysis of second-oxidized coal

Deng

Zhao

Huang

et al. 2016

J Therm Anal Calorim

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Among coal-producing countries, China has witnessed the highest frequency and severity of coal fires. During mining in the re-mining face and the lower part of the thick coal seam (or coal seam group), second or multiple oxidations of the residual coal can readily occur in mined-out areas, severely increasing the risk of coal fires. The study of multiple oxidations of coal aids in the early detection of spontaneous combustion of remaining coal in the mined-out areas. The characteristics of coal fires are demonstrated using fresh coal samples (first-oxidized coal) and oxidized coal samples (second-oxidized coal) from four different ranks of coals. Proximate and elemental analysis, Fourier transform spectroscopy, and thermogravimetry-differential scanning calorimetry were adopted to investigate the quality, microcharacteristics, characteristic temperatures, and apparent activation energy of second-oxidized coal. In addition, the effect of spontaneous combustion at heating rates of 5.0, 10.0, and 15.0°C min -1 was studied. Compared with the four samples of first-oxidized coal, those of second-oxidized coals cause fire easily under the same conditions. List of symbolsA, A k Pre-exponential factor (s -1 ) A ad Ash content in air-dried basis (%) bHeating rate (°C min -1 ) C daf C content of air-dried basis (%) da/dt Conversion rate (s -1 ) E a , E k Apparent activation energy (kJ mol -1 ) f(a)Function of degree of conversion (dimensionless) H daf H content of air-dried basis (%) M ad Moisture in air-dried basis (%) N daf N content of air-dried basis (%) R Universal gas constant (8.314 J mol -1 K -1 ) r Correlation coefficient (dimensionless) O daf O content of air-dried basis (%) S daf S content of air-dried basis (%) T Thermokinetic temperature (K) T 1 First characteristic temperature, critical temperature (°C) T 2 Second characteristic temperature, active temperature (°C) T 3 Third characteristic temperature, pyrolysis temperature (°C) T 4 Fourth characteristic temperature, ignition temperature (°C) T 5 Fifth characteristic temperature, burned-out temperature (°C)

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Kissinger kinetic analysis of data obtained under different heating schedules

Cited by 98 publications

References 40 publications

Quantitative Characterization of Multicomponent Polymers by Sample-Controlled Thermal Analysis

Quantitative Characterization of Multicomponent Polymers by Sample-Controlled Thermal Analysis

Estudio cinético de las reacciones de recocido en aleaciones de Cu-Ni-Fe

Thermal behavior and microcharacterization analysis of second-oxidized coal

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