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Šimon, Peter; Kolman, Ľ.

doi:10.1023/a:1011569117198

Cited by 82 publications

(18 citation statements)

References 4 publications

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“…Sˇimon et al [67][68][69][70][71] have presented models to describe isothermal and non-isothermal IP.…”

Section: A Induction Period Methodsmentioning

confidence: 99%

“…The induction period method of Sˇimon [67][68][69][70][71] is an isoconversional method to perform kinetic analysis from fixed value conversions obtained from a set of thermoanalysis runs. The first detectable manifestation of the IP occurs at its end or equivalently the start of the main transformation process, given by an initial conversion fraction x i , which is assumed to be the same for any temperature.…”

Section: A Induction Period Methodsmentioning

confidence: 99%

“…[53][54][55][56][57][58][59][60][61][62][63][64][65][66][67][68][69][70][71] Most studies involve non-isothermal conditions because many reactions occur before a prescribed isothermal condition could be reached. In these nonisothermal methods, the instrument measures a response variable, e.g., temperature, heat flux or weight, during the temperature history and interprets its changes as proportional to the changes in the fraction reacted as a function of temperature, T, or time, t. The data is analyzed to extract reaction kinetic parameters such as activation energy, E, pre-exponential or frequency factor, A, and order of reaction exponent, n. Among several methods, the Kissinger method, [53,54,65] is the most popular.…”

Section: Theoretical Frameworkmentioning

confidence: 99%

“…As described in Section II-A, the method presented by Sˇimon and Kolman [67] was applied to evaluate the modified activation energy B i and the modified frequency factor A 0 i needed to define the duration of the induction period of the transformations associated with all of the peaks appearing in the nonisothermal DSC tests carried out at constant heating rate and at constant cooling rate, using the onset temperatures of all these peaks.…”

Section: Induction Periodmentioning

confidence: 99%

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Estimation of Time–Temperature-Transformation Diagrams of Mold Powder Slags from Thermo-analysis of Non-isothermal Crystallization

Maldonado

et al. 2014

Metall Mater Trans B

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The temperature range across the mold powder slag in the interfacial gap between the continuous casting mold and strand leads through different transformation behavior into crystalline phases. The transformation rates play a key role in determining the proportion of glassy and crystalline phases present, and thus greatly influence mold heat transfer and lubrication. Although thermal analysis has held great promise to quantify the crystallization of mold slags, so far the information it has provided is scarce. This work shows how differential scanning calorimetry, DSC, data allow evaluation of Time-Temperature-Transformation, TTT, diagrams of mold powder slags, when analyzed with the induction period and the Kissinger methods. The data required for estimating this important tool for the analysis and design of mold powders are onset temperature, T i , peak maximum temperature, T m , shape index, S, and conversion at peak maximum, x m , of the crystallization peaks appearing on thermograms obtained at various heating and cooling rates, / or À/, respectively. Industrial mold powders for casting low-and medium-carbon steels were analyzed to obtain TTT diagrams which correctly portray their different crystallization behavior. The diagrams reveal the start and end curves of the crystalline phases forming at each DSC crystallization peak. The estimated TTT curves present a correct picture of the degree of transformation observed in glass disks (~3 mm thick) treated isothermally for specified time intervals, quenched and examined with a scanning electron microscope. Additionally, the procedure developed for DSC-based TTT diagram calculation is supported by the good agreement between expected transformations and qualitative or quantitative X-ray diffraction results obtained from mold glass-powdered samples treated isothermally in a muffle furnace.

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“…Sˇimon et al [67][68][69][70][71] have presented models to describe isothermal and non-isothermal IP.…”

Section: A Induction Period Methodsmentioning

confidence: 99%

Section: A Induction Period Methodsmentioning

confidence: 99%

Section: Theoretical Frameworkmentioning

confidence: 99%

Section: Induction Periodmentioning

confidence: 99%

See 2 more Smart Citations

Estimation of Time–Temperature-Transformation Diagrams of Mold Powder Slags from Thermo-analysis of Non-isothermal Crystallization

Maldonado

et al. 2014

Metall Mater Trans B

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“…On the other hand, there is no change of pressure during the testing procedure, and the effect of test conditions on the experimental results is negligible. Therefore, in recent years, more and more researchers study the antioxidant effect on the oxidation kinetics of materials by OOT values obtained under non‐isothermal conditions in an atmosphere of oxygen 11, 12. In addition, OOT can be used to estimate the OIT values 13–16.…”

Section: Introductionmentioning

confidence: 99%

Structure effect of benzofuranone on the anti‐oxidation kinetics in polypropylene

Cai

Meng

Shen

et al. 2010

Asia-Pacific J Chem Eng

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Benzofuranone compounds are used as chain-breaking antioxidants in the melt processing of polymers owing to their strong hydrogen donating ability. In this article, the structural effects of benzofuranone compounds on anti-oxidation in polypropylene (PP) were evaluated using oxidation onset temperature (OOT) of PP stabilised by the compounds in oxygen and the oxidation kinetics of the PP was studied using Ozawa and Kissinger methods, respectively. The results show that benzofuranone compounds inhibit the oxidative degradation of PP by increasing the oxidation activation energy, and the higher the oxidation activation energy of PP, the better the anti-oxidation activity of benzofuranone in PP. Furthermore, the anti-oxidation activity of benzofuranone compounds in PP is weakened by the methyl group in the 2 -position. Compared to benzofuranone compounds OXBF1 and TBF1 without 2 -position methyl group, PP stabilised by benzofuranone compound MXBF1 with 2 -position methyl group has lower OOT values and smaller oxidation activation energy. 

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Application of Thermal Methods in Food Forensics

2017

Food Forensics and Toxicology

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Untitled

Cited by 82 publications

References 4 publications

Estimation of Time–Temperature-Transformation Diagrams of Mold Powder Slags from Thermo-analysis of Non-isothermal Crystallization

Estimation of Time–Temperature-Transformation Diagrams of Mold Powder Slags from Thermo-analysis of Non-isothermal Crystallization

Structure effect of benzofuranone on the anti‐oxidation kinetics in polypropylene

Application of Thermal Methods in Food Forensics

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