Metallocene-catalyzed short chain branched polyethylene (SCBPE) was blended with LDPE

HDPE

PS

EPDM and iPP in the weight proportions of 80 and 20. The crystallization and mechanical properties of these blends were studied by PLM

DSC and DMA. It has been observed in PLM that SCBPE/LDPE

SCBPE/HDPE and SCBPE/EPDM can form band spherulites whose band width and size are both smaller than that of the pure SCBPE. Tiny crystallites are observed in the completely immiscible SCBPE/PS blend. The crystallites in SCBPE/iPP are very small and only irregular spherulites are seen. The crystallization kinetics and mechanical properties of SCBPE are greatly affected by the second polyolefin

but in a different way

depending on the phase behavior and the modulus of the second components. SCBPE may be phase miscible in the melt with HDPE

LDPE and EPDM and co-crystallize together with HDPE or LDPE during cooling. A big change of crystal morphology and crystallization kinetics is seen in SCBPE//PP blend compared with pure SCBPE and the lowest tanδ is also seen for this system. DMA results show that the tensile modulus of the blends has nothing to do with phase behavior

but only depends on the modulus of the second component.