Studies on the use of polyolefin elastomer (POE) and high density\npolyethylene (HDPE) for toughening polypropylene (PP) to meet the demands of\nautomobile bumpers were conducted. The effect of the basic resin, POE and the\ninfluences of the POE amount and HDPE doses on the mechanical properties of the\nblended composites were discussed. The morphology of impact fracture sections\nwere characterized by scanning electron microscopy (SEM) while the crystalline\nproperties were investigated by DSC. The effect of the composites� morphology on\nmechanical properties was also discussed. Results showed that POE could improve\nthe impact strength of PP while the use of HDPE had obvious effects on synergistic\ntoughening. SEM images and DSC data analysis testified to the relationship between\nmorphology, crystallinity and the mechanical properties.
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