Thermolysis of potassium tetraperoxochromate(V)

Лесникович, А. И.; Levchik, Sergei V.; Kovalenko, K. K.

doi:10.1016/0040-6031(86)85338-2

Cited by 7 publications

(11 citation statements)

References 4 publications

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“…There is a possibility that the true f (α) does not belong to the set of preestablished differential functions of conversion. It was shown 7 that this disadvantage could be removed by using the invariant kinetic parameters method (IKP method) suggested by Lesnikovich and Levchik 8, 9, which permits the evaluation of the invariant activation parameters that can be used for the numeric evaluation of f (α).…”

Section: Introductionmentioning

confidence: 99%

On the evaluation of the nonisothermal kinetic parameters of (GeS₂)_0.3(Sb₂S₃)_0.7 crystallization using the IKP method

Budrugeac

Criado

Gotor

et al. 2004

Int J of Chemical Kinetics

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The isoconversional method suggested by Friedman and the invariant kinetic parameters method (IKP) were used in order to examine the kinetics of the nonisothermal crystallization of (GeS 2 ) 0.3 (Sb 2 S 3 ) 0.7 . The objective of the paper is to show the usefulness of the IKP method both for determining the activation parameters as well as the model of the investigated process. It was shown that the kinetic triplet [(E, A, f (α), where E is the activation energy, A is the preexponential factor, and f (α) is the differential function of conversion], which results through the application of the IKP method, depends on the set of kinetic models considered. For different sets of kinetic models, proportional values of f (α) are obtained. A criterion for the selection of this set, the use of which lead to the true kinetic triplet corresponding to the analyzed process (E = 163.2 kJ mol −1 ; A = 2.47 × 10 12 min −1 and the Avrami-Erofeev model, A m , for m = 2.5-2.6 was suggested. C

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Section: Introductionmentioning

confidence: 99%

On the evaluation of the nonisothermal kinetic parameters of (GeS₂)_0.3(Sb₂S₃)_0.7 crystallization using the IKP method

Budrugeac

Criado

Gotor

et al. 2004

Int J of Chemical Kinetics

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“…Lesnikovich and Levchik [8,9] discussed the significance of these values and demonstrated the following relationships:…”

Section: Scanning Electron Microscopymentioning

confidence: 94%

“…Invariant Kinetic Parameters (IKP) Method [8,9,10] To determine the invariant activation energy (E inv ) and the pre-exponential factor (A inv ) the rate expression, da/dt, was assumed to be equal to the following equation:…”

Section: Scanning Electron Microscopymentioning

confidence: 99%

Thermal Stability Evaluation of PA6/LLDPE/SEBS‐g‐DEM Blends

Cataño

Albano

Karam

et al. 2007

Macromolecular Symposia

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Summary:The thermal stability of a polyamide-6/low linear density polyethylene blend (PA6/LLDPE) was studied using thermal analysis techniques. The thermogravimetric studies carried out showed that when a diethyl maleate grafted styreneethylene/butadiene-styrene terpolymer (SEBS-g-DEM) is added to the PA6/LLDPE blend there is an actual enhancement of the thermal stability due to the increase in the interfacial area within the blend. The Invariant Kinetic Parameter method (IKP) proved to be a qualitative technique unfolding the type of degradation mechanisms taking place in the material vicinity. Nucleation and phase boundary reactions are the kinetic models of thermal decomposition with the most significant probability of occurring.

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“…The necessary condition for constructing a multiple regression equation is that the factors x i (solvent properties) should not be linearly interrelated; in particular, the nonorthogonality of the factors x i should not exceed 0.8 [13]. Otherwise, the mathematical model becomes ambiguous, and its parameters may be interpreted equivocally.…”

Section: Influence Of Properties Of Nonaqueous Solvents 27mentioning

confidence: 98%

“…The correlation analysis [13,14] allows construction of a multiple linear regression equation of type (5) describing the dependence of the Gibbs energy of a process DG on the solvent properties x i [15317]:…”

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confidence: 99%

Influence of Properties of Nonaqueous Solvents on the Solubility of NH4Cl and Thermodynamics of Its Solution

et al. 2005

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The solubility of ammonium chloride in acetonitrile, dioxane, and 2-propanol in the range 298.153338.15 K was determined using 36 Cl tracer. The influence of properties of nonaqueous solvents on the solubility of ammonium, potassium, and sodium chlorides was subjected to thermodynamic and correlation analysis. The low solubility of ammonium chloride in dioxane and acetonitrile is due to the endothermic effect, and its high solubility in 2-propanol, to the exothermic effect of the salt solution. The entropy of solution affects the solubility of ammonium chloride in acetonitrile only slightly, in contrast to dioxane and 2-propanol in which the entropies of solution are significant and have opposite signs. The solubility of ammonium and potassium chlorides depends on the electron-acceptor power of the solvents and electrostatic interactions in solution, whereas the solubility of sodium chloride in organic solvents is determined by the combined influence of the donor3acceptor and dielectric properties of the solvents.The standard thermodynamic characteristics of solution and solvation of electrolytes reflect the total effect from the ion3solvent and solvent3solvent interactions. The ion3solvent interactions involve the following effects [1]: polarization of the medium; changes in the solvent structure; creation of a cavity in the solvent for accommodation of the dissolved ion; specific interactions of ions with solvent molecules (hydrogen bonding, donor3acceptor interactions).Our goal was to study the thermodynamics of solution of ammonium chloride in dioxane, acetonitrile, and 2-propanol and to examine the solvent effects on the solubility of ammonium, sodium, and potassium chlorides in nonaqueous solvents by methods of correlation and regression analysis, based on the experimental results obtained and on the published data. The solubility of ammonium chloride in dioxane, acetonitrile, and 2-propanol in the range 298.153 338.15 K was determined using 36 Cl tracer. The labeled salt NH 4 36 Cl was prepared by ion exchange of ammonium chloride with H 36 Cl. The total error of the radiometric measurement results was evaluated according to GOST (State Standard) 8-207376 [2]. The solubilities L in nonaqueous solvents at 298.153338.15 K, calculated as arithmetic mean values of separate determinations at a confidence level of 0.95, are listed in Table 1. The confidence interval [D a = +t a sn 31/2 , where t a is Student's coefficient; s, rms deviation of the solubility; n, number of samples taken (no less than 18)] for theH 4 Cl solubility is +(6 0 10 36 3 0.001) M depending on the solvent and temperature. The values by which the solubility in the examined solvents varies with temperature (DL T ) exceed the error of L determination: dL T is 21.5 0 10 35 in dioxane, 3.2 0 10 34 in acetonitrile, and 4.0 0 10 33 M in 2-propanol (Table 1).With increasing temperature, the salt solubility in nonaqueous solvents increases. The coefficients of the temperature dependence of the NH 4 Cl solubility in nonaqueous solvents, ln L = a + b...

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Thermolysis of potassium tetraperoxochromate(V)

Cited by 7 publications

References 4 publications

On the evaluation of the nonisothermal kinetic parameters of (GeS₂)_0.3(Sb₂S₃)_0.7 crystallization using the IKP method

On the evaluation of the nonisothermal kinetic parameters of (GeS₂)_0.3(Sb₂S₃)_0.7 crystallization using the IKP method

Thermal Stability Evaluation of PA6/LLDPE/SEBS‐g‐DEM Blends

Influence of Properties of Nonaqueous Solvents on the Solubility of NH4Cl and Thermodynamics of Its Solution

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Thermolysis of potassium tetraperoxochromate(V)

Cited by 7 publications

References 4 publications

On the evaluation of the nonisothermal kinetic parameters of (GeS2)0.3(Sb2S3)0.7 crystallization using the IKP method

On the evaluation of the nonisothermal kinetic parameters of (GeS2)0.3(Sb2S3)0.7 crystallization using the IKP method

Thermal Stability Evaluation of PA6/LLDPE/SEBS‐g‐DEM Blends

Influence of Properties of Nonaqueous Solvents on the Solubility of NH4Cl and Thermodynamics of Its Solution

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On the evaluation of the nonisothermal kinetic parameters of (GeS₂)_0.3(Sb₂S₃)_0.7 crystallization using the IKP method

On the evaluation of the nonisothermal kinetic parameters of (GeS₂)_0.3(Sb₂S₃)_0.7 crystallization using the IKP method