Journal ArticleDOI
Rational approximations of the integral of the Arrhenius function
G. I. Senum,Ralph T. Yang +1 more
Reads0
Chats0
TLDR
Rational approximations have been derived for the integral of the Arrhenius function dT which is important in the kinetic analysis of thermogravimetric data and is found to be equivalent to the Gorbachev approximation.Abstract:
Rational approximations have been derived for the integral of the Arrhenius function
$$\int\limits_0^T {\exp ( - E/RT)}$$
dT which is important in the kinetic analysis of thermogravimetric data. The first degree rational approximation is found to be equivalent to the Gorbachev approximation, i.e., RT2
exp (−E/RT)/(E+2RT). The second degree rational approximation is more accurate than the Zsako empirical approximation when E/RT 5. The third and higher degree rational approximations are found to be more accurate than any other previous approximation.read more
Citations
More filters
Journal ArticleDOI
Approximation-based integral versus differential isoconversional approaches to the evaluation of kinetic parameters from thermogravimetry: kinetic analysis of the dehydration of a pharmaceutical hydrate
TL;DR: In this article, the relative accuracies of approximation-based integral versus differential isoconversional approaches for actual E determination were investigated on experimental dehydration data of roxithromycin monohydrate from thermogravimetric (TG) analysis.
Journal ArticleDOI
The kinetic and thermodynamic study of KNiPO4·H2O from DSC and TG data
TL;DR: In this paper, the authors showed that the water molecule was eliminated from the structure at 300°C, after which the spontaneously reversible hydration-rehydration process was observed, and the surface area of the final product at 350°C (aging time over 8h) is higher than that of the synthesized compound.
Journal ArticleDOI
Dehydration of rhyolite: activation energy, water speciation and morphological investigation
TL;DR: In this article, the kinetics of hydrous rhyolite dehydration were investigated by thermogravimetry up to 1000°C, at heating rates of 2.5, 5, 10 and 20°Cmin−1 and under inert atmosphere.
Journal ArticleDOI
Apparent kinetics of nonisothermal high temperature oxidative degradation of ethylene homopolymers: effects of residual catalyst surface chemistry and structure
Muhammad Atiqullah,Mohammad M. Hossain,Syed Masiur Rahman,Khurshid Alam,Hasan A. Al-Muallem,Alharbi Abdulrahman F,Ikram Hussain,Anwar Hossaen +7 more
TL;DR: In this paper, the effects of two supported residual catalysts (Ziegler-Natta and another metallocene) on the nonisothermal thermooxidative degradation of the resulting ethylene homopolymers were investigated using TGA experiments and kinetic modeling.
Journal ArticleDOI
Cure Kinetics of Electrically Conductive Adhesives for Solar Cell Interconnection
Torsten Geipel,Ulrich Eitner +1 more
TL;DR: In this article, the authors used dynamic differential scanning calorimetry (DSC) to determine the activation energy in dependence of the degree of cure for any given temperature profile and validate the model with an arbitrary temperature profile in the DSC and find good agreement between experiment and simulation within 3-8% absolute difference in the degreeof-cure.
References
More filters
Journal ArticleDOI
Kinetic Parameters from Thermogravimetric Data
A. W. Coats,J. P. Redfern +1 more
TL;DR: In this article, a thermocouple is used to measure the sample temperature in a Stanton HT-D thermobalance, the bead of which is positioned in or near the sample, depending on crucible design.
Journal ArticleDOI
Empirical formula for the exponential integral in non-isothermal kinetics
TL;DR: The exponential integral of the exponential integral can be approximated by means of the empirical formula, e.g. as mentioned in this paper, which approximates p(x) = - \int\limits_\infty ^x {\frac{{e^{ - u} }}{{u^2 }}} \cdot du\).
Journal ArticleDOI
Reaction kinetics and differential thermal analysis
Ralph T. Yang,Meyer Steinberg +1 more
TL;DR: In this paper, the relationship between chemical kinetics and differential thermal analysis (DTA) curves is studied for the reactions which follow the general rate expression: r = r/sub 0/e/sup -E/RT/(1 - x).