Melt Rheological Properties of LLDPE/PP Blends Compatibilized by Cross-Linked LLDPE/PP Blends (LLDPE-PP)

A novel linear low-density polyethylene (LLDPE)/polypropylene (PP) blends were prepared by melt blending with moderate cross-linked LLDPE/PP blend (LLDPE–PP) as compatibilizer, the rheological properties associated with the morphological structure of the LLDPE/PP/LLDPE-PP blends were studied by SEM, capillary rheometer, HAAKE torque rheometer and melt fiow rate instrument. The results showed that adding LLDPE-PP in the blends improved compatibility between LLDPE and PP phases, made the pseudo plastic behavior of the melt decrease and the melt viscosity and the balance torque increase slightly. Moreover, in the range of high shear rate, the die-swell ratio of the blends decreased with increasing LLDPE-PP content.