Study of the Degradation of a Polyesther-Polyurethane by TGA and the Logistic Mixture Model

Abstract:

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The logistic mixture model was successfully studied previously in the separation of overlapping steps in some polymeric systems by the authors. In the present work, this method is applied to a polyesther-polyurethane degradation under air and inert atmospheres at several heat rates (5, 10, 15, 20 and 25 °C/min) in dynamic TGA. Every logistic component is fitted by reaction order, Johnson-Mehl-Avrami and Sestak-Berggren kinetics equations in order to calculate its kinetic parameters (activation energy, frequency factor and exponents). The reaction order model gives a good fitting and reproduces accurtelly the experimental curves. Johnson-Mehl-Avrami and Sestak- Berggren equations resulted to be not suitables because of the activation energy values obtained.

Info:

Periodical:

Materials Science Forum (Volumes 587-588)

Edited by:

António Torres Marques, António Fernando Silva, António Paulo Monteiro Baptista, Carlos Sá, Fernando Jorge Lino Alves, Luís Filipe Malheiros and Manuel Vieira

Pages:

525-528

DOI:

10.4028/www.scientific.net/MSF.587-588.525

Citation:

F. Barbadillo et al., "Study of the Degradation of a Polyesther-Polyurethane by TGA and the Logistic Mixture Model", Materials Science Forum, Vols. 587-588, pp. 525-528, 2008

Online since:

June 2008

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Price:

$35.00

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