Simulations for evaluation of kinetic methods in differential scanning calorimetry. Part 3 — Peak maximum evolution methods and isoconversional methods

Sbirrazzuoli, Nicolas; Girault, Y.; Elegant, L.

doi:10.1016/s0040-6031(97)00023-3

Cited by 160 publications

(86 citation statements)

References 25 publications

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“…where A is the pre-exponential factor in s -1 , E a is the apparent activation energy in J/mol, R is the ideal gas constant in J·mol -1 ·K -1 , and T is the absolute temperature in K. Four kinetic methods widely used in order to study dynamic kinetics of thermosetting polymers are Kissinger (Equation (3)), Ozawa (Equation (4)), Friedman (Equation (5)), and Flynn-WallOzawa (Equation (6)) methods [40][41][42][43]:…”

Section: Kinetic Analysismentioning

confidence: 99%

Curing of bisphenol A-aniline based benzoxazine using phenolic, amino and mercapto accelerators

Ručigaj¹,

Alič²,

Krajnc³

et al. 2015

Express Polym. Lett.

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Abstract. The curing of bisphenol A-aniline based benzoxazine was studied applying different accelerators (4,4"-thiodiphenol, o-dianisidine, 2-mercaptobenzimidazole and 4-mercaptophenol) to initiate the catalytic ring-opening of benzoxazine. Possible pathways of benzoxazine ring-opening, polymerization and cross-linking without and with the addition of different accelerators are presented. The curing kinetics was investigated by model-free kinetic analysis of experimental data obtained by differential scanning calorimetry (DSC). The addition of different accelerators significantly reduced the onset temperature of curing in dynamic experiments. The effects of accelerators on the results of isothermal conversion prediction were studied and discussed in detail. Among the used accelerators, thiodiphenol showed the best accelerating efficiency and was consequently used in further studies, where its amount was varied. By low heating rate DSC analysis the catalytic ring-opening, thermally accelerated ring-opening and the diffusion-controlled steps were identified. The amount of added accelerator affected particularly the ring-opening and diffusion-controlled steps.

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Section: Kinetic Analysismentioning

confidence: 99%

Curing of bisphenol A-aniline based benzoxazine using phenolic, amino and mercapto accelerators

Ručigaj¹,

Alič²,

Krajnc³

et al. 2015

Express Polym. Lett.

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“…De forma general, un cambio significativo de la forma del pico en la curva, dα dT vs T, con la velocidad de calentamiento, β , implica una variación también significativa de α m con β [94]. …”

Section: E Runclassified

Sinterización de compactos de vidrio y de composites vidrio-circón. Mecanismo y cinética del proceso

Roca¹

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“…The fundamental assumption of the model-free method is that the reaction model f(α) is not dependent on temperature or heating rate. [13] In this work, two different isoconversional methods, the differential Friedman method and the integral Kissinger-Akahira-Sunose method [30] were used to determine the apparent Ea. The Friedman isoconversional method [31] is a widely used differential method that, unlike conventional integral model-free methods, provides accurate values of activation energies even if the activation energy is a function of the reacted fraction.…”

Section: Kinetic Theor Ymentioning

confidence: 99%

Kinetic Study of Thermal Degradation of High-impact Polystyrene Nanocomposites with Different Flame Retardants using Isoconversional and Model Fitting Methods

Katančić¹,

Grčić²,

Hrnjak-Murgić³

2017

Croat. Chem. Acta

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The non-isothermal degradation of pure high-impact polystyrene (HIPS) and flame retarded HIPS nanocomposites was investigated in the temperature range 25-550 °C at four heating rates in an inert atmosphere. Three different phosphate and polyphosphate based flame retardants were used, while nanosilica and montmorillonite clay were used as nanofillers. Kinetic analysis was performed using isoconversional and model fitting non-linear regression method. Activation energy (Ea) was determined by isoconversional methods of Friedman and KissingerAkahira-Sunose while true kinetic triplets (Ea, A, f(α)) were determined by one step and two-step non-linear regression with various reactions mechanisms. It was found that flame retarded samples exhibit complex degradation which cannot be satisfactorily described by single reaction model fitting. Instead, when each distinctive degradation step was modelled individually it was possible to obtain good fit with Reaction order and Avrami-Erofeev proposed mechanisms while the same was not possible for Diffusion and Autocatalytic mechanisms.

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Simulations for evaluation of kinetic methods in differential scanning calorimetry. Part 3 — Peak maximum evolution methods and isoconversional methods

Cited by 160 publications

References 25 publications

Curing of bisphenol A-aniline based benzoxazine using phenolic, amino and mercapto accelerators

Curing of bisphenol A-aniline based benzoxazine using phenolic, amino and mercapto accelerators

Sinterización de compactos de vidrio y de composites vidrio-circón. Mecanismo y cinética del proceso

Kinetic Study of Thermal Degradation of High-impact Polystyrene Nanocomposites with Different Flame Retardants using Isoconversional and Model Fitting Methods

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