Toughening modification of PBT/PC blends by PTW

Poly(butylene terephthalate)(PBT)/polycarbonate(PC)/ethylene-butylacrylate-glycidyl methacrylate (PTW) blends containing PTW as toughening modifier were obtained by extrusion and injection molding. The mechanical properties of the PBT/PC/PTW blends were investigated. The results showed that the addition of PTW led to great increases in the impact strength, elongation at break, Vicat temperature and a reduction in the tensile strength and flexural properties of PBT/PC blends. The blend morphology was observed by scanning electron microscopy and the dispersed phase average diameter was determined by image analysis. The relation between the impact resistance and the phase morphology was discussed, and the critical ligament size for PBT/PC was determined.