Journal
INTERNATIONAL JOURNAL OF CHEMICAL KINETICS
Volume 51, Issue 10, Pages 799-814Publisher
WILEY
DOI: 10.1002/kin.21310
Keywords
electrical properties; maleimide and epoxy resins; thermal properties; thermosets
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Two thermoset systems based on maleimides and diglycidyl ether of bisphenol A (DGEBA) cured with p-aminobenzoic acid were characterized in terms of thermal and electrical behavior. Thermal characterization has been undertaken by means of thermogravimetric analysis in nitrogen atmosphere up to 600 degrees C using simultaneous thermogravimetric/Fourier transform infrared/mass spectrometry (TG/FT-IR/MS) analysis. In the first stage of thermal degradation, the global kinetic parameters [activation energy (E-a) and preexponential factor (log A(1) (s(-1)))] were calculated using the isoconversional method of Friedman. The energies variation as well as the shape of the differential thermal analysis curves suggests that the thermal decomposition process occurred in multiple stages. The evolved gases analysis was conducted by simultaneous TG/FT-IR/MS coupled techniques. Dielectric relaxation spectroscopy characterization was also made.
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