Paper Title:
Study of the Degradation of a Polyesther-Polyurethane by TGA and the Logistic Mixture Model
  Abstract

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, A. Fuentes, S. Naya, R. Cao, J. L. Mier, R. Artiaga, "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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$32.00
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