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

Fernando Barbadillo; A. Fuentes; Salvador Naya; Ricardo Cao; José Luís Mier; Ramón Artiaga

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

Paper Titles

Melting of PP/PA6 Polymer Blends in Single Screw Extruders – An Experimental Study
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Design and Optimisation of a Blow Moulded Container
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Preparation and Properties of Novel In Situ Composite Materials Based on Polyethylene-Polyamide Oriented Blends
p.515

Preparation of Biodegradable Materials by Reactive Extrusion
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Study of the Degradation of a Polyesther-Polyurethane by TGA and the Logistic Mixture Model
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Uniaxial Stretching above the Glass Transition Temperature of Poly(Ethylene Terephthalate) and its Effects on the Structure Development
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Influence of the Crystallization Kinetics on the Microstructural Properties of γ-PVDF
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Catalytic Performance of Copper-Substituted Polyoxotungstate Materials and X-Ray Structure of a New Sandwich-Type Compound
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Photodegradation Studies of Poly(Vinylidene Fluoride)
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HomeMaterials Science ForumMaterials Science Forum Vols. 587-588Study of the Degradation of a...

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.