Journal of Thermal Analysis and Calorimetry

, Volume 94, Issue 2, pp 539–543 | Cite as

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

  • D. dos Santos Dias
  • Marisa Spirandeli Crespi
  • C. A. Ribeiro


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.


PET varnish varnish and PET-R 


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Copyright information

© Springer Science+Business Media, LLC. 2008

Authors and Affiliations

  • D. dos Santos Dias
    • 1
  • Marisa Spirandeli Crespi
    • 1
  • C. A. Ribeiro
    • 1
  1. 1.UNESP, Instituto de QuímicaSão Paulo State UniversityAraraquaraBrazil

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