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  • steady-state approximation  (3)
  • thermal stability  (3)
  • thermooxidative degradation  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Thermal Stability of Some Polynuclear Coordination Compounds in the Systems Ln(III)—Co(II)—Oxalate (1999)
    Springer
    Journal of thermal analysis and calorimetry 58 (1999), S. 103-111 
    Details
    ISSN: 1572-8943
    Keywords: Ln(III)–Co(II) coordination compounds ; non-isothermal kinetics ; thermal stability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract This paper reports an investigation of the thermal stabilities of the class of coordination compounds containing lanthanide ions Ln(III) (Ln=La, Sm, Eu, Dy, Er), Co(II) ions and oxalate anions C2O 4 2− . The thermal decomposition steps were identified, and in some cases the values of the non-isothermal kinetic parameters were determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010131617489
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  • 2
    Electronic Resource
    Electronic Resource
    Changes in the Mechanical Properties and Thermal Behaviour of LDPE in Response to Accelerated Thermal Aging (1998)
    Springer
    Journal of thermal analysis and calorimetry 53 (1998), S. 801-808 
    Details
    ISSN: 1572-8943
    Keywords: accelerated thermal aging ; LDPE ; mechanical properties ; thermooxidative degradation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The accelerated thermal degradation of low-density polyethylene (LDPE) was studied in air at atmospheric pressure and temperatures of 70, 80, 90 and 100°C. The changes in elongation at break, traction resistance and density as a result of accelerated thermooxidative degradation were followed. Thermal analysis curves (TG, DTG and DTA) of non-aged and thermally aged LDPE were recorded, and the thermal analysis results were compared with those relating to the variations in the elongation at break, the traction resistance and the density as a consequence of accelerated thermal aging.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010186610454
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  • 3
    Electronic Resource
    Electronic Resource
    Steady-State Approximation. 5 (1999)
    Springer
    Journal of thermal analysis and calorimetry 56 (1999), S. 851-854 
    Details
    ISSN: 1572-8943
    Keywords: activation energy ; non-isothermal kinetics ; steady-state approximation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The example of the sequence of reactions $${\text{A}}\xrightarrow{{k_1 }}{\text{B}}\xrightarrow{{k_2 }}{\text{C}}$$ and the steady-state approximation are used to present a demonstration of the fact that the evolution of the reaction rates under non-isothermal conditions depends on the ratio of the activation energies and on the heating rate. At the same time, it is shown that, under isothermal conditions, the ratio of the activation energies plays no role.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010130928799
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  • 4
    Electronic Resource
    Electronic Resource
    On the Validity of the Steady-State Approximation in Non-Isothermal Kinetics: Part IV. The case of constant rate thermal analysis (1999)
    Springer
    Journal of thermal analysis and calorimetry 58 (1999), S. 677-681 
    Details
    ISSN: 1572-8943
    Keywords: constant rate thermal analysis ; non-isothermal kinetics ; steady-state approximation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The paper investigates the validity of steady-state approximation for the case of constant rate thermal analysis experiments. It is shown that the approximation holds for the experiments run with a controlled rate of either the decomposition of the compound, or the production of gas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010173015831
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  • 5
    Electronic Resource
    Electronic Resource
    Thermooxidative degradation of an unsaturated polyester resin (1997)
    Springer
    Journal of thermal analysis and calorimetry 49 (1997), S. 183-191 
    Details
    ISSN: 1572-8943
    Keywords: kinetics ; thermooxidative degradation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The results of non-isothermal kinetic analysis of the thermooxidative degradation in air and oxygen of an unsaturated polyester resin are presented. It has been shown that the thermooxidative degradation in oxygen occurs at lower temperatures than the thermooxidative degradation in air. The kinetic parameters of the thermooxidative degradation depend on the heating rate and the oxygen pressure. Two straight lines of InAvs. E (A is the preexponential factor andE is the activation energy), characteristic for the compensation effect, have been obtained for the thermooxidative degradation in air and in oxygen respectively. The difference between the intercepts of these straight lines can be explained by dependence of the pre-exponential factor on the oxygen pressure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01987438
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  • 6
    Electronic Resource
    Electronic Resource
    On the Thermal Behaviour of some Polyimide Membranes (1998)
    Springer
    Journal of thermal analysis and calorimetry 52 (1998), S. 383-391 
    Details
    ISSN: 1572-8943
    Keywords: glass transition ; kinetic parameters ; polyimide membranes ; thermal stability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The authors present their results concerning the influence of the nature and amount of plasticizer on the thermal stability of some polyimide membranes. A non-isothermal kinetic investigation of some thermal decomposition workable steps was performed too.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010161910090
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  • 7
    Electronic Resource
    Electronic Resource
    Thermal Stability and Non-isothermal Decomposition Kinetics. Heteropolynuclear compounds of Cu(II) (2000)
    Springer
    Journal of thermal analysis and calorimetry 59 (2000), S. 977-984 
    Details
    ISSN: 1572-8943
    Keywords: coordination compounds ; non-isothermal kinetics ; thermal stability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Data concerning the thermal behaviour of four heteropolynuclear compounds with the general formula [CuML(CH3COO)3] whereM=Ni(II), Zn(II), Mn(II) and Co(II); LH=2-amino-5-mercapto-1,2,3-thiadiazole were obtained. For the kinetically workable decomposition steps the values of the kinetic parameters were estimated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010147013942
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  • 8
    Electronic Resource
    Electronic Resource
    On the Validity of the Steady-state Approximation in Non-isothermal Kinetics. Part III (2000)
    Springer
    Journal of thermal analysis and calorimetry 61 (2000), S. 209-218 
    Details
    ISSN: 1572-8943
    Keywords: non-isothermal kinetics ; numerical solution of differential kinetic equations ; steady-state approximation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The authors continue their considerations concerning the validity of the steady-state approximation in non-isothermal kinetics. A sequence of two first-order consecutive reactions with an active intermediate was subjected to kinetic analysis by numerical solution of the corresponding differential kinetic equations for a number of particular cases. The results demonstrated that the rate of change of concentration of the active intermediate is negligibly small if the assumption made in the isothermal case is also accepted for the non-isothermal case, i.e. k 2(T(t))〉〉 k 1(T(t)).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010189414530
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  • 9
    Electronic Resource
    Electronic Resource
    Estimation of Activation Energies for Thermooxidative Degradations of LDPE and NBR from Non-Isothermal and Isothermal DTA Data (1998)
    Springer
    Journal of thermal analysis and calorimetry 54 (1998), S. 765-773 
    Details
    ISSN: 1572-8943
    Keywords: activation energy ; isothermal kinetics ; non-isothermal kinetics ; thermooxidative degradation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Results obtained on the thermooxidative degradations of LDPE (low-density polyethylene) and NBR (nitrile-butadiene rubber) are presented. The activation energies for the thermooxidations leading to solid products were estimated. For LDPE, the activation energies obtained from non-isothermal data are in satisfactory agreement with those obtained from isothermal data. For NBR, the isothermal activation energy is ≉16% higher than the non-isothermal one. This difference is due to the morphological changes undergone by NBR during its heating at the rather high temperatures at which isothermal measurements were performed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010135702511
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