Comments on multiple publications reporting single heating rate kinetics

Vyazovkin, Sergey

doi:10.1002/aoc.6929

Cited by 10 publications

(3 citation statements)

References 30 publications

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“…This example reinforces the recommendation of the International Confederation for Thermal Analysis and Calorimetry (ICTAC) that single heating rate methods should be avoided in favor of methods that use multiple heating rates simultaneously [5]. Ignoring this simple recommendation leads to estimating invalid kinetic triplets, which, when used in simulations, produce entirely meaningless results [57,58].…”

Section: Avrami-arrhenius Treatment For Limited Temperature Rangesupporting

confidence: 60%

Nonisothermal Crystallization Kinetics by DSC: Practical Overview

Vyazovkin

Sbirrazzuoli

2023

Processes

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Providing a minimum of theory, this review focuses on practical aspects of analyzing the kinetics of nonisothermal crystallization as measured with differential scanning calorimetry (DSC). It is noted that kinetic analysis is dominated by approaches based on the Avrami and Arrhenius equations. Crystallization kinetics should not be considered synonymous with the Avrami model, whose nonisothermal applications are subject to very restrictive assumptions. The Arrhenius equation can serve only as a narrow temperature range approximation of the actual bell-shaped temperature dependence of the crystallization rate. Tests of the applicability of both equations are discussed. Most traditional kinetic methods tend to offer very unsophisticated treatments, limited only to either glass or melt crystallization. Differential or flexible integral isoconversional methods are applicable to both glass and melt crystallization because they can accurately approximate the temperature dependence of the crystallization rate with a series of the Arrhenius equations, each of which corresponds to its own narrow temperature interval. The resulting temperature dependence of the isoconversional activation energy can be parameterized in terms of the Turnbull–Fisher or Hoffman–Lauritzen theories, and the parameters obtained can be meaningfully interpreted and used for kinetic simulations.

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Section: Avrami-arrhenius Treatment For Limited Temperature Rangesupporting

confidence: 60%

Nonisothermal Crystallization Kinetics by DSC: Practical Overview

Vyazovkin

Sbirrazzuoli

2023

Processes

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“…This fact, as well as the necessity to adapt the use of experimental methods to a significant degree can, however, lead to drawing extremely far-reaching conclusions without due experimental justification. This issue has already been noted in literature, as seen in the case of the criticism of kinetics studies that utilise a single heating rate in thermal analysis [12].…”

Section: Introductionmentioning

confidence: 87%

Elucidating the Mechanisms of Reactions in Energetic Materials: A Critical Methodology Review

Łysień,

Jarosz,

Głosz

et al. 2024

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Identification of the mechanism of changes taking place in energetic materials (EMs) is one of the most important issues in the rational design and use of EMs. Due to the extremely rapid nature of these changes, reliable monitoring and real-time analysis are extremely difficult. Hence, analysis of the mechanism of such processes often has to rely on adaptation of classical methods or on comparison of the initial and final states of the EM. In this critical review, we focus on current approaches to the methodology of investigating the mechanisms of processes taking place in EMs, showcasing viable experimental strategies, points of uncertainty, and adaptations of classical instrumental methods.

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“…While the reliability of thermochemical data in a given work may raise no concerns by itself, a comparison of multiple works on the same material can reveal significant discrepancies between the reported results. Methodological issues and insufficiently precise descriptions of experimental procedures are two more identified points of concern regarding the reliability of reported thermochemical data [10,11], with the former compromising the validity of reported thermochemical data and the latter precluding verification of data through the repetition of the reported experiments. These issues are further exacerbated by the lack of experiment repetition or the lack of statistical work-up if the experiments have been repeated.…”

Section: Introductionmentioning

confidence: 99%

Thermal Properties of Energetic Materials—What Are the Sources of Discrepancies?

Stolarczyk

Jarosz

2022

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Thermal analysis is widely used to investigate the properties of a variety of energetic materials, including the mutual compatibility of components of energetic material mixtures. Although thermal analysis methods are a valuable source of information about energetic materials, their use requires careful consideration of the employed methodology, as well as an understanding of the thermally induced processes taking place within energetic materials. Several case studies involving the study of energetic materials are presented, in order to highlight some of the most relevant issues in the application of thermal analysis methods. Some recommendations about the application of thermal analysis methods and accompanying methodologies for estimating other properties of energetic materials are also included.

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Comments on multiple publications reporting single heating rate kinetics

Cited by 10 publications

References 30 publications

Nonisothermal Crystallization Kinetics by DSC: Practical Overview

Nonisothermal Crystallization Kinetics by DSC: Practical Overview

Elucidating the Mechanisms of Reactions in Energetic Materials: A Critical Methodology Review

Thermal Properties of Energetic Materials—What Are the Sources of Discrepancies?

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