Isotactic polypropylene is among one of the most applied general plastics. To overcome its shortcoming of brittleness

many methods were developed to modify the toughness of iPP

in which compounding with polyolefin elastomers is a commonly used method. In the present paper

characterization method on the miscibility of polymer blends and several well-established toughening theories were introduced

as well as the advance in polyolefin elastomer modifying iPP in recent years.