Chemical Industry and Chemical Engineering Quarterly 2013 Volume 19, Issue 2, Pages: 253-262
https://doi.org/10.2298/CICEQ111110059J
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Isoconversional kinetic analysis of the alkyd/melamine resins curing
Jovičić Mirjana (Faculty of Technology, Novi Sad)
Radičević Radmila (Faculty of Technology, Novi Sad)
Pavličević Jelena (Faculty of Technology, Novi Sad)
Bera Oskar (Faculty of Technology, Novi Sad)
The curing reaction for the mixtures of alkyd resins based on ricinoleic
acid, phthalic anhydride and three polyols (glycerin, trimethylolpropane or
ethoxylated pentaerythritol) with two different commercial melamine resins
was investigated by differential scanning calorimetry (DSC). The curing
kinetics analysis was performed using the isoconversional methods
(Ozawa-Flynn-Wall, Kissinger-Akahira-Sunose and Friedman). Isoconversional
methods were carried out with three heating rates (5, 10 and 20°C/min) in a
scanning temperature range from 40 to 250°C. It was found that the curing
activation energy of resin mixtures is influenced by alkyd and melamine resin
type due to the catalytic effect of hydroxyl group on the reactions. The
dependence of apparent curing degree on time, which was obtained by
mathematical transformations of dynamic DSC data using Ozawa-Flynn-Wall
method, describes well the isothermal DSC experiments.
Keywords: coating, thermosetting resins, curing, DSC, isoconversional methods