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Study Of Mechanical, Rheological And Morphological Properties Of Ternary Compatibilized Polyolefins/PA Blends

R.Krache, D.Benachour

The effect of polyamide and reactive compatibilizer SEBS-MAH on morphology, melt rheological properties and impact strength was investigated for compatibilized polyolefin pre-blends. The blends were prepared by melt mixing using twin-screw extruder. PP/PE blends showed dispersed morphology. The addition of SEBS to the blends increased their viscosity and elasticity, and changed their morphology to a co-continuous structure. Morphology of compatibilized polyolefin/PA blends exhibited finer dispersion than that of the non-compatibilized blends, except for the composition 80%PA where a clear phase separation was observed. The impact strength presented a synergetic behavior with a maximum at 90%PA content. The predicted phase inversion composition according to Paul, Metelkin, and Utracki models for the compatibilized polyolefin/PA blends, was located at the 50%PA composition.