The miscibility of reactive blends of PN(Propargyl novolac)resin and PAA(Polyarylcetylene)resin was studied．Evaluation on the storage stability

processability of the blends and thermal stability of the cured blends were also presented．As evidenced from phose observation

DSC analysis

SEM and TEM investigation

PN—PAA reactive blends were completely homogeneous．Compared with PAA

the blends exhibited improved storage stability at room temperature．The blends could be cured in a controllable way

thus the processability of the blends was marginally improved comparad with that of PAA resin．DMA and TGA analyses indicated that the blends possessed high thermal stability(glass transition temperature as high as 380℃)．Owing to the low viscosity of the blends and a proper gel time

as well as the elimination of volatiles during the curing process

the reactive blends are suitable for many processes including RTM(Resin transfer mold)．The reactive blends of PIN resin and PAA resin are amongst novel matrices of advanced materials for high temperature ablative and thermo—structural applications．