Hemijska industrija 2011 Volume 65, Issue 6, Pages: 717-726
https://doi.org/10.2298/HEMIND110912088P
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Curing kinetics of two commercial urea-formaldehyde adhesives studied by isoconversional method
Popović Mlađan (Faculty of Forestry, Belgrade)
Budinski-Simendić Jaroslava 
(Faculty of Technology, Novi Sad)
Jovičić Mirjana (Faculty of Technology, Novi Sad)
Mursics Joszef (Nafta Petrohem, Lendava, Slovenia)
Điporović-Momčilović Milanka (Faculty of Forestry, Belgrade)
Pavličević Jelena (Faculty of Technology, Novi Sad)
Ristić Ivan (Faculty of Technology, Novi Sad)
Differential scanning calorimetry (DSC) was used to evaluate the curing
kinetics of two commercial urea-formaldehyde (UF) adhesives having different
formaldehyde to urea (F/U) ratio of 1.112 (UF1) and 1.086 (UF2). DSC
measurements were done in dynamic scanning regime with heating rates of 5,
10, 15 and 20ºC•min-1 in order to determine the activation energy for each
adhesive. Obtained data were analyzed using isoconversional methods with
application of Ozawa-Flynn-Wall and Kissinger-Akahira-Sunose kinetic models.
In addition, different catalyst levels were tested at the heating rate of
10°C/min. Results showed that the adhesive with higher F/U ratio achieved
higher activation energy, while having lower peak temperature of curing
reaction. It was also noticed that the increase of catalyst level influenced
the increase of reaction enthalpy of the adhesive with lower F/U ratio.
Keywords: UF adhesives, curing kinetics, DSC method, isoconversional models