http://lattes.cnpq.br/8591935194938224; ALBUQUERQUE, Ananda Karoline Camelo de.
Abstract:
Compounds based on epoxidized soybean oil (ESO) were thermally cured with
methyl tetrahydrophthalic anhydride (MTHPA) as hardener and 2,4,6tris
(dimethylaminomethyl) phenol (DEH 35) as catalyst. In order to understand the
influence of MTHPA and DEH 35 contents on the curing and degradation,
ESO/MTHPA/DEH 35 system was investigated using Fourier transform infrared
spectroscopy (FTIR), differential scanning calorimetry (DSC) and thermogravimetric
analysis (TGA). From the FTIR spectra collected before curing, secondary
interactions between ESO carbonyl groups and DEH 35 hydroxyl/amine. The curing
was followed based on the reactive chemical groups evolution and data were
corroborated with DSC results. The curing activation energy (Ea), was evaluated
using Friedman model and presented values between 44,3 e 37,1 kJ/mol ( α = 0,8)
for the compounds ESO:MTHPA 87:5 and 87:10, respectively; upon the hardner
and catalyst content increased greater thermal stability was verified. Friedman,
Ozawa, Flynn and Wall models were used to investigate the degradation, as well as
to measure the associated activation energy, which presented values between
105,4 e 14,5 kJ/mol. The achieved results in this study provide understanding and
control tools to the curing and degradation mechanisms of ESO/MTHPA/DEH 35
system.