The phase morphology and thermal behavior of various isotactic polypropylene (PP)/linear low density polyethylene (LLDPE) blends were investigated with aid of scanning electron microscopy (SEM) and differential scanning calorimetry (DSC)

respectively. The effect of barrel (melt) temperature on the morphology

thermal behavior and the resultant mechanical properties of the injection molded bars was the research focus

and the influence of LLDPE composition was also taken into account. It was found that the mechanical properties

especially the tensile ductility and the impact strength

were greatly affected by the processing temperature. The samples obtained at low temperatures had the highest elongation at break and impact strength

while those molded at high temperatures had the poorest toughness. Two reasons were responsible for that: first

the phase size in the samples increased with the processing temperature; second

possible orientation existed in the samples obtained at low processing temperatures.