Journal ArticleDOI
Modification of the integral isoconversional method to account for variation in the activation energy
TLDR
Vyazovkin et al. as discussed by the authors used an integration technique that properly accounts for the variation in the activation energy, which was implemented as a modification of the earlier proposed advanced isoconversional method and applied to the thermal decomposition of calcium oxalate monohydrate and ammonium nitrate.Abstract:
Integral isoconversional methods may give rise to noticeable systematic error in the activation energy when the latter strongly varies with the extent of conversion. This error is eliminated by using an integration technique that properly accounts for the variation in the activation energy. The technique is implemented as a modification of the earlier proposed advanced isoconversional method [Vyazovkin, S. J Comput Chem 1997, 18, 393]. The applications of the modified method are illustrated by simulations as well as by processing of data on the thermal decomposition of calcium oxalate monohydrate and ammonium nitrate. © 2000 John Wiley & Sons, Inc. J Comput Chem 22: 178–183, 2001read more
Citations
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ICTAC Kinetics Committee recommendations for performing kinetic computations on thermal analysis data
Sergey Vyazovkin,Alan K. Burnham,José M. Criado,Luis A. Pérez-Maqueda,Crisan Popescu,Nicolas Sbirrazzuoli +5 more
TL;DR: In this article, the authors have developed recommendations for reliable evaluation of kinetic parameters (the activation energy, the preexponential factor, and the reaction model) from the data obtained by means of thermal analysis methods such as TGA, differential scanning calorimetry (DSC), and differential thermal analysis (DTA).
Journal ArticleDOI
Biomass pyrolysis kinetics: A comparative critical review with relevant agricultural residue case studies
TL;DR: A critical review of kinetic models and mathematical approximations currently employed in solid state thermal analysis is provided and analysis of thermal decomposition data obtained from two agricultural residues, nutshells and sugarcane bagasse reveals the inherent difficulty and risks involved in modeling heterogeneous reaction systems.
Journal ArticleDOI
Isoconversional Kinetic Analysis of Thermally Stimulated Processes in Polymers
TL;DR: Isoconversional analysis of polymer kinetics has been studied extensively over the past decade as discussed by the authors and has been applied to a wide range of applications, including thermal degradation, crosslinking, glass transition, and glass and melt crystallization.
Journal ArticleDOI
Determination of pyrolysis characteristics and kinetics of palm kernel shell using TGA–FTIR and model-free integral methods
TL;DR: Based on TGA-FTIR analysis and model free integral kinetics method, the pyrolysis mechanism of PKS was elaborated in this article, where the activation energy dependent on the conversion rate was estimated by two model-free integral methods: Flynn-Wall-Ozawa (FWO) and Kissinger-Akahira-Sunose (KAS).
Journal ArticleDOI
Can nanoparticles really enhance thermal stability of polymers? Part I: An overview on thermal decomposition of addition polymers
TL;DR: In this paper, the effect of different nanoparticles, their dispersion and the used modifiers, on polymer thermal stability was highlighted, highlighting the effect that hydrogen or covalent bonds can increase the adhesion of nanoparticles with the polymer matrix, resulting in higher dispersion degrees.
References
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A New Method of Analyzing Thermogravimetric Data
TL;DR: In this paper, a new method of obtaining the kinetic parameters from thermogravimetric curves has been proposed, which is simple and applicable to reactions which can not be analyzed by other methods.
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Kinetics of thermal degradation of char-forming plastics from thermogravimetry. Application to a phenolic plastic
TL;DR: In this article, a technique was devised for obtaining rate laws and kinetic parameters which describe the thermal degradation of plastics from TGA data, based on the inter-comparison of experiments which were performed at different linear rates of heating.
Journal ArticleDOI
General treatment of the thermogravimetry of polymers
Joseph H. Flynn,Leo A. Wall +1 more
TL;DR: It is concluded that methods involving a variable rate of heating or involving several thermogravimetric traces at different rates of heating are capable of establishing the uniqueness of kinetic parameters.
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Algorithms for minimization without derivatives
TL;DR: This monograph describes and analyzes some practical methods for finding approximate zeros and minima of functions.
Journal ArticleDOI
Model-free and model-fitting approaches to kinetic analysis of isothermal and nonisothermal data
TL;DR: In this paper, the model-free and model-fitting approaches have been applied to data for nonisothermal and isothermal thermal decompositions of HMX and ammonium dinitramide.