Tensile properties of blends of phenolphthalein poly(ether ether sulphone) with a poly(ether imide)

Blends of phenolphthalein poly(ether ether sulphone) (PES-C) with a poly(ether imide) (PEI) in various proportions were prepared by the coprecipitation method. Mechanical properties and morphology of the blends were studied using tensile tests and scanning electron microscopy (SEM). The tensile moduli exhibit positive deviations from simple additivity. Marked positive deviations were also observed for ultimate strength. These results suggest that the PEI/PES-C blends are mechanically compatible. SEM study revealed that the blends are not homogeneous but fine dispersions are obtained. The interfaces between the two phases are well bonded. PES-C and PEI are partially miscible on the segmental level.