The properties, morphology, and miscibility of isotactic polypropylene (PP) blended with a series of hydrogenated polystyrene-block-polybutadiene-block-polystyrene (SEBS) were investigated using tensile test, transmission electron microscope(TEM), dynamic mechanical analysis (DMA), differential scanning calorimetry (DSC), pulse NMR. These copolymers were prepared by hydrogenation of anionically polymerized same amounts of polystyrenes and polybutadienes with controlled amounts of 1, 2 addition (vinyl content) from 41 to 85%. TEM images showed that the phase separated structures were independent of the vinyl content of the SEBS in the PP/SEBS=70/30 blends, and that the miscibility of the blend was increased with increasing the vinyl content of the SEBS. This structure improves the mechanical properties and transparency of the blends.
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