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  • Author or Editor: V. Fadeeva x
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Abstract  

This paper reports a linear relationship between kinetic characteristics from the Arrhenius equation describing a decomposition process found when studying the kinetics of thermolysis of spatially hindered phenols. This relationship between the coefficients is known in the literature as a 'compensation effect'. The existence of the compensation effect permits some conclusions concerning the decomposition mechanism and thermal characteristics of the compounds under investigation.

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Abstract  

A new method was developed for evaluation of the results of thermal analysis of phenol stabilizers used for the thermal stabilization of light-coloured polymers. The integral observed decomposition temperature obtained by using Doyle's method from the thermogravimetric curves was used as a basis of approach. For this purpose, the computational program TERMOGRAF for PC/AT is suggested. It is considered that the integral observed decomposition temperature is a more reliable and reproducible characteristic of thermal stability than the approach based on the temperature of beginning of decomposition.

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Abstract  

The present paper deals with thermal decomposition of some spatially hindered phenols, which are in the industry as stabilizers in synthetic materials used. The investigated stabilizers are separated to two groups in respect to mechanism of decomposition (group I and II). This assumption was confirmed by chromatomass-spectrometric investigations. It allows a stabilizer for forming a plastic with variety properties to choose.

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Calculation of the kinetic parameters

Thermal decomposition of some phenol stabilizers on the basis of thermoanalytical data

Journal of Thermal Analysis and Calorimetry
Authors: O. N. Nikulicheva, V. P. Fadeeva and V. A. Logvinenko

The paper reports the calculation of kinetic parameters (activation energy, pre-exponent and reaction order) of thermodegradation of some phenol stabilizers. For this purpose, a software package for IBM-compatible personal computers is proposed. The first calculation of kinetic parameters (E, Z, n) was carried out for these compounds. The package can be applied for kinetic calculations on the thermodegradation of other substances.

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