Molding Process 5 views

POE toughened PP impact strength not up to standard

Problem Phenomenon

POE/PP blend impact only 3-5kJ/m², below the 10kJ/m² target

Cause Analysis

POE dispersed phase particle size >1μm too large instead of 0.2-0.5μm for effective toughening; addition amount <10wt% insufficient

Solution

1) POE 15-20wt%; 2) Twin-screw 300-400rpm; 3) POE-g-MAH 1-3wt%; 4) Control cooling to avoid coarsening

Key Takeaway

The key to POE toughened PP is dispersed phase 0.2-0.5μm and interfacial adhesion

POE toughened PPimpact strengthdispersed phase particle sizePOE-g-MAHsilver streak shear band

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