Abstract: The POE/PP compounding system was fabricated by adding different contents of ultrahigh flowable PP into POE. The processing performance, mechanical properties, electrical insulation properties and compatibility of this compounding system were investigated extensively. The results indicated that the melt flow rate increased along with a decrease in processing torque with increasing content of ultrahigh flowable PP. The elongation at break presented an increase in the beginning and then kept stable at a certain value, whereas the tensile strength showed a trend from rise to decline. On the other hand, the volume resistance of compounding system revealed a drastic increase when the content of ultrahigh flowable PP exceeded 20 wt %. The compounding system achieved a maximum value in dielectric strength at a PP content of 5 %, but the dielectric strength began to decline over this loading of ultrahigh flowable PP. This compounding system presented a microstructural evolution from a “seaisland” form to the network one and then to the ribbon one with an increase of the content of ultrahigh flowable PP.

Key words: ultrahigh mobility polypropylene, polyolefin elastomer, blending system