ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The logistic mixture model was successfully studied previously in the separation ofoverlapping steps in some polymeric systems by the authors. In the present work, this method isapplied to a polyesther-polyurethane degradation under air and inert atmospheres at several heatrates (5, 10, 15, 20 and 25 ºC/min) in dynamic TGA. Every logistic component is fitted by reactionorder, Johnson-Mehl-Avrami and Sestak-Berggren kinetics equations in order to calculate its kineticparameters (activation energy, frequency factor and exponents). The reaction order model gives agood 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
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.587-588.525.pdf
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