Formalkinetische Behandlung des Masseverlustes bei thermischen Abbauprozessen von Polymeren unter nichtisothermen Bedingungen

Behnisch, J.; Schaaf, E.; Zimmermann, H.

doi:10.1007/bf01909914

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The Approximations For the Temperature Integrals1

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1979

1990

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Cited by 6 publications

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“…The accuracy of these expressions has been estimated both via a direct comparison with the tabulated values of the temperature integrals [14,[16][17][18][19][20][21] and in the context of a critical analysis of integral methods for determining the kinetic parameters [22][23][24].…”

Section: The Approximations For the Temperature Integralsmentioning

confidence: 99%

Thermogravimetry. Empirical approximation for the “temperature integrals”

Agherghinei¹

1990

Journal of Thermal Analysis

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temperature integrals pm (x)= .eojx e-Xu-2-mdu with m = 0, 1/2 and 1 are apThe proximated using empirical formulae of the type Ax--Be -cx. For estimation of the precision of these approximations, the relative errors were calculated for integral values ofx. It was established that forx < 19 the maximum relative error is 0.26%, while for 19 < x -<50 it is less than 0.1%. The suggested approximations allow a sensible improvement of the integral methods intended to determine the kinetic parameters of the process concerned. The present paper shows that these functions can be approximated with excellent accuracy within the intervals (5, 17) and (17, 50) by using expressions of the type Ax'Be "cx. KineticsThe thermogravimetric study takes into account the following equation: r / dt = ZTme -EIRT (1-c)n (1)

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