The cure reaction behavior of 6421 BMI resin was investigated by the DSC method. The relationship
between the curing degree and temperature as well as curing rate and time were obtained. Based on Melak method,
the curing reaction behavior was analyzed. The corresponding parameters of the n-order curing model, the autocatalytic
model and the Kamal model were determined by fitting the experimental data, respectively. According to the coefficient
values of R2, a suitable curing reaction kinetic model was determined. It was found that the curves of curing degree
vs temperature presented a “S” shape and the curing rate increased with the rising heating rate. The apparent activation
energy Ea of curing reactions is 105. 611 kJ/ mol, while the curing reaction conformed to the Kamal reaction
kinetic model. The Kamal model is in a good agreement with the experimental data.