Abstract
To better understand the mechanism of polymer-toughing with rubber and the critical matrix ligament thickness theory developed by Wu, the rubber particle shape was controlled as elongated and oriented instead of spherical in PP/EPDM blends via dynamic packing injection molding. For the first time, the brittle-ductile-brittle transition was observed with increasing rubber content. This result clearly indicates that Wu's theory applies only for cubic or spherical particles but not for elongated and oriented particles. The higher stress concentration will be expected at the tip, which causes blends to fail in brittle mode. More work is needed to verify this expectation.
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