Non-isothermal kinetics of dehydration of some selenite hexahydrates

Vlaev, L. T.; Nikolova, Maria M.; Gospodinov, G. G.

doi:10.1016/j.jssc.2004.04.036

Cited by 65 publications

(47 citation statements)

References 19 publications

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“…The reaction model may take different equations, [28,29] usually being considered as those associated with Avrami, diffusion, phase boundary, power law and reaction order kinetic models. For each degree of conversion, Equation (4) shows a linear relationship between the logarithm of the time needed to reach that conversion level and the inverse of the temperature.…”

Section: Kinetic Analysismentioning

confidence: 99%

Poly[(4‐hydroxybutyric acid)‐alt‐(glycolic acid)]: Synthesis by Thermal Polycondensation of Metal Salts of 4‐Chlorobutyric Acid Carboxymethyl Ester

Martínez-Palau

Franco

Ramis

et al. 2005

Macro Chemistry & Physics

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Summary: A new sequential copolyester consisting of glycolic acid and 4‐hydroxybutyric acid units was prepared by a thermal polycondensation method that uses the formation of metal chloride salts as a driving force. The polymerization conditions (time, temperature) were studied in order to obtain appropriate molecular weights and high yields. Thermal properties and thermal stability were also determined. The polymerization kinetics of sodium, potassium and cesium monomer derivatives were studied by differential scanning calorimetry and the results compared. Non‐isothermal data and an isoconversional procedure (free model) were applied to determine the Arrhenius parameters (activation energy and pre‐exponential factor). The kinetic model was selected according to both the Coats‐Redfern method and the evaluation of isokinetic parameters.

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Section: Kinetic Analysismentioning

confidence: 99%

Poly[(4‐hydroxybutyric acid)‐alt‐(glycolic acid)]: Synthesis by Thermal Polycondensation of Metal Salts of 4‐Chlorobutyric Acid Carboxymethyl Ester

Martínez-Palau

Franco

Ramis

et al. 2005

Macro Chemistry & Physics

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“…The latter usually represents the limiting stage of the reaction-the chemical reactions; random nucleation and nuclei growth; and phase boundary reaction or diffusion. Algebraic expressions of functions of the most common reaction mechanisms operating in solid-state reactions are presented in Table 1 [11][12][13][14][15].…”

Section: Calculation Of the Activation Energy By Isoconversional Methodsmentioning

confidence: 99%

“…The equations used for E α calculation are Ozawa equation: Table 1 Algebraic expressions of functions g(α) and f (α) and their corresponding mechanisms [5,9,[11][12][13] No. Symbol Name of the function…”

Section: Calculation Of the Activation Energy By Isoconversional Methodsmentioning

confidence: 99%

Kinetics of Thermal Transformation of Mg3(PO4)2 · 8H2O to Mg3(PO4)2

Boonchom

2010

Int J Thermophys

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The kinetics of thermal dehydration of Mg 3 (PO 4 ) 2 · 8H 2 O was investigated using thermogravimetry at four different heating rates. The activation energies of the dehydration step of Mg 3 (PO 4 ) 2 · 8H 2 O were calculated through the isoconversional Ozawa and Kissinger-Akahira-Sunose (KAS) methods and iterative methods, which were found to be consistent and indicate a single mechanism. The possible conversion function of the dehydration reaction for Mg 3 (PO 4 ) 2 ·8H 2 O has been estimated through the Coats and Redfern integral equation, and a better kinetic model such as random nucleation of the "Avrami-Erofeev equation (A 3/2 model)" was found. The thermodynamic functions ( H * , G * , and S * ) of the dehydration reaction are calculated by the activated complex theory and indicate that it is a non-spontaneous process when the introduction of heat is not connected.

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“…However, if the E a values are dependent on , the decomposition should be interpreted in terms of multi-step reaction mechanisms [17,[22][23][24][25][26][27][28][29]. The shapes of the dependence of E a on ˛ have been identified from model data for competing [30], independent [31], consecutive [32], and reversible [33] reactions, as well as reactions complicated by diffusion [34].…”

Section: Thermogravimetric Analysis (Tga)mentioning

confidence: 99%

Synthesis and degradation kinetics of a novel polyester containing bithiazole rings

Luyt

et al. 2011

Thermochimica Acta

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Non-isothermal kinetics of dehydration of some selenite hexahydrates

Cited by 65 publications

References 19 publications

Poly[(4‐hydroxybutyric acid)‐alt‐(glycolic acid)]: Synthesis by Thermal Polycondensation of Metal Salts of 4‐Chlorobutyric Acid Carboxymethyl Ester

Poly[(4‐hydroxybutyric acid)‐alt‐(glycolic acid)]: Synthesis by Thermal Polycondensation of Metal Salts of 4‐Chlorobutyric Acid Carboxymethyl Ester

Kinetics of Thermal Transformation of Mg3(PO4)2 · 8H2O to Mg3(PO4)2

Synthesis and degradation kinetics of a novel polyester containing bithiazole rings

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