Abstract
In this work, the effect of pyrogallol which served as a phenolic nucleophile on the ring-opening polymerization and curing kinetics of the eugenol/stearylamine-based benzoxazine (E-s) was examined with phenol as a contrast. The differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy (FTIR) results revealed that pyrogallol demonstrated higher ability to promote the ring-opening polymerization of E-s compared to phenol. The exothermal peak temperature of E-s was reduced from 254 °C to 168 °C with the addition of pyrogallol. Moreover, the curing kinetics of the E-s and pyrogallol mixture (E-s/py) were studied with Kissinger, Ozawa, Flynn-Wall-Ozawa and Friedman methods. The results indicated that the apparent activation energies (Ea) of E-s decreased with the addition of pyrogallol. In addition, the polymerization process of E-s/py followed the autocatalytic kinetic model based on Friedman method.
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