A kind of allylated benzoxazine containing N鄄substituted m鄄methyl benzene ring (BA鄄mt) was synthe鄄
sized from the Mannich reaction of paraformaldehyde, bisphenol A and m鄄toluidine. The structure of BA鄄mt was con鄄
firmed by Fourier transform infrared spectroscopy (FTIR) and proton nuclear magnetic resonance spectroscopy (1 H鄄
NMR). The allylated benzoxazine BA鄄mt was mixed with bis(4鄄maleimidophenyl) methane ( BMI) and diallyl bis鄄
phenol A (DABPA) in different mass ratio. The curing reaction process of modified BMI/ DABPA/ BA鄄mt resin was
examined by differential scanning calorimeter ( DSC). Dynamical thermal mechanical analysis ( DMA) and thermo鄄
gravimetric analysis (TGA) were used to study their thermal properties. The results show that thermal stability of the
cured BMI/ DABPA resin decreases with addition of BA鄄mt. However, the loss weight temperature at 10wt% of the
cured resins in N2 is still higher than 400益, and the char yield at 800益increases to 33wt%. The glass transition
temperature of the cured resin with 10 parts of BA鄄mt in BMI/ DABPA reaches 319益. The bending property of the
cured BMI/ DABPA resin increases with addition of BA鄄mt in the resin. And the bending strength and modulus of the
modified BMI/ DABPA resin based on 10 parts by weight of BA鄄mt are 44 MPa and 3. 76 GPa, respectively. The wa鄄
ter absorption of the cured modified BMI resins decreases with addition of BA鄄mt content.