Morphology and Toughening Mechanism of EPDM Toughened PP/HDPE Blends
In order to improve the toughening efficiency of polypropylene(PP)and study its toughening mechanism,PP/HDPE/EPDM blends were prepared by melt blending with PP/HDPE blends as matrix and ethylene propylene diene monomer(EPDM)as toughening modifier.The results show that the core-shell structure of EPDM and HDPE is dispersed in the matrix,and the interaction force between EPDM and matrix is enhanced.EPDM promotes the crystallization of PP,but inhibits the crystallization of HDPE,thereby refining the dispersed phase of the core-shell structure.With the increase of EPDM content(4%～12%),the impact strength of PP/HDPE/EPDM blends is enhanced,and EPDM can toughen PP while slowing down the rapid decline of PP tensile strength.When the EPDM content is up to 16%,the impact strength of the blend reaches 11.18 kJ/m2,which is 158%higher than the PP/HDPE blends.The toughening mechanism of PP/HDPE/EPDM blend is the cavitation effect of EPDM shell and HDPE core structure,which enhances its energy absorption.
PolypropyleneHigh density polyethyleneEthylene propylene diene monomerImpact strengthToughening mechanism
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