RTM polyimide matrix resins and composites mainly including the modified PMR polyimide and prepolymer synthesized with phenylethynyl agent were reviewed in this paper .The imide oligomers synthesized with phenylethynyl agent showed low melt viscosity and high melt stability
and the cured resin and composite exhibited high thermal stability and good mechanical property .The chemical synthesis
structure
properties of the matrix resins and composites were discussed .Their applications in aerospace and electronic industry were also presented .