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Non-isothermal decomposition kinetics of the interaction of poly(ethylene terephthalate) with alkyd varnish

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Abstract

The recycling of soft drink bottles poly(ethylene terephthalate) (PET) has been used as an additive in varnish containing alkyd resin. The PET, called to recycled PET (PET-R), was added to the varnish in increasing amounts. Samples of varnish containing PET-R (VPET-R) were used as a film onto slides and its thermal properties were evaluated using thermogravimetry (TG). Throughout the visual analysis and thermal behavior of VPET-R it is possible to identify that the maximum amount of PET-R added to the varnish without changing in the film properties was 2%.

The kinetic parameters, such as activation energy (E) and the pre-exponential factor (A) were calculated by the isoconversional Flynn-Wall-Ozawa method for the samples containing 0.5 to 2.0% PET-R. A decrease in the values of E was verified for lower amounts of PET-R for the thermal decomposition reaction. A kinetic compensation effect (KCE) represented by the lnA=−13.42+0.23E equation was observed for all samples. The most suitable kinetic model to describe this decomposition process is the autocatalytic Šesták-Berggren, being the model applied to heterogeneous systems.

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Authors and Affiliations

  1. UNESP, Instituto de Química, São Paulo State University, Araraquara, Brazil

    D. dos Santos Dias, Marisa Spirandeli Crespi & C. A. Ribeiro

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  1. D. dos Santos Dias
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  2. Marisa Spirandeli Crespi
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  3. C. A. Ribeiro
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Correspondence to D. dos Santos Dias.

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dos Santos Dias, D., Crespi, M.S. & Ribeiro, C.A. Non-isothermal decomposition kinetics of the interaction of poly(ethylene terephthalate) with alkyd varnish. J Therm Anal Calorim 94, 539–543 (2008). https://doi.org/10.1007/s10973-008-8435-2

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  • DOI: https://doi.org/10.1007/s10973-008-8435-2

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