Application of non-isothermal cure kinetics on the interaction of poly(ethylene terephthalate) - Alkyd resin paints

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Dias, D. S. [UNESP]
Crespi, Marisa Spirandeli [UNESP]
Ribeiro, Clovis Augusto [UNESP]
Fernandes, J. L S [UNESP]
Cerqueira, H. M G [UNESP]
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Samples of paint (P), reused PET (PET-R) and paint/PET-R mixtures (PPET-R) were evaluated using DSC to verify their physical-chemical properties and thermal behavior. Films from paints and PPET-R are visually similar. It was possible to establish that the maximum amount of PET-R that can be added to paint without significantly altering its filming properties is 2%. The cure process (80-203°C) was identified through DSC curves. The kinetic parameters, activation energy (E a) and Arrhenius parameters (A) for the samples containing 0.5 to 1% of PET-R, were calculated using the Flynn-Wall-Ozawa isoconversional method. It was observed that for greater amounts of PET-R added, there is a decrease in the E a values for the cure process. A Kinetic compensation effect (KCE), represented by the equation InA=-2.70+0.31E a was observed for all the samples. The most suitable kinetic model to describe this cure process is the autocatalytic Šesták-Berggreen, model applied to heterogeneous systems. © 2007 Springer Science+Business Media, LLC.
Paint, Paint/PET-R mixture, PET, Activation energy, Alkyd resins, Film growth, Mathematical models, Polyethylene terephthalates, Reaction kinetics, Thermal effects, Alkyd resin paints, Nonisothermal curing
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Journal of Thermal Analysis and Calorimetry, v. 91, n. 2, p. 409-412, 2008.