Effective Parameters on the Phase Morphology and Mechanical Properties of PP/PET/SEBS Ternary Polymer Blends

In this work, ternary polymer blends based on polypropylene (PP)/ polyethylene terephthalate (PET) oly(styreneb (ethylenecobutylene)bstyrene) (SEBS) triblock copolymer and a reactive maleic anhydride grafted SEBS (SEBSgMAH) at various compositions were prepared by corotating twin screw extruder. The effects of PET, SEBS and SEBSgMAH compatibilizer on morphology of the blends were examined by scanning electron microscopy (SEM). The blends morphology was also estimated by some predicting methods, however, SEM results revealed some contrasts between results of predicting methods and the real morphology. Population of individual and coreshell particles as well as average diameter of the rubberbased cavities is extremely dependent on SEBS, SEBSgMA and PET content. Mechanical inspection tests showed that in comparison with the pure PP, addition of SEBS/SEBSMA causes an increase in the impact strength of the system. Keeping other parameters constant, with increase in SEBS rubbery phase, the coreshell morphology was affected and the impact strength increased consequently. On the other hand, increase in PET content results in modulus increase and the impact strength decrease. Finally, the optimum processing conditions for compounding ternary PP/PET/SEBS blends were achieved.