A new additive 2-butanone oxime was developed and its effect on the curing properties of a mixed allyl phenols modified bismaleimide resin 6421 was studied in this paper.Non-isothermal DSC showed that the exothermic peak temperature was significantly decreased by by about 35 K depending on the heating rate after the 6421 resin was was simply doped with 2 wt% 2-butanone oxime.Study of the curing kinetics by using Kissinger and Crane equations showed that the curing activation energy was reduced from 93.6 kJ/mol to 81.8 kJ/mol.The doped resin had a much higher degree of cure than the neat reasin after curing at same conditions.Fourier transform infrared spectra showed that the additive can react with bismaleimide and accelerate the reactions of C = C of bismaleimide or mixed allyl phenols during curing.As a result

the surface skin phenomenon of the bismaleimide resin during curing process was completely prevented.Cured resin with smooth surface was obtained as a result benefited from the change of curing kinetics.Rheological tests showed that the time range of low viscosity at 150 ℃ was increased.After curing under the standard curing condition of the control bismaleimide resin

the glass transition temperature of the cured doped resin was 40 K higher than that of the control cured resin.Compared with the neat 6421 resin

the doped resin could be pre-cured at 150~160 ℃ and further post-cured at 200 ℃ without mould showing no fracture or shape deformation.It indicated that the doped resin showed applicable for low temperature curing and high temperature use.