Abstract: Blends of poly (phthalazinone ether sulfone) (PPES)and poly(phenylene sulfide) (PPS) were prepared by injection molding. The processability, miscibility, and mechanical properties of the blends were investigated. It was found that the melt index of the blends increased with increasing PPS content. DSC and SEM showed that the blends were thermodynamic incompatible systems. With the increasing PPS content, the mechanical properties of the blends first decreased and then increased, the mechanical properties of the blends showed the minimum when the PPS content was about 30%.

Key words: poly phthalazinone ether sulfone, polyphenylene sulfide, melt flow rate, miscibility