Study on Mechanical Properties and Phase Morphology of Thermoplastic Polyurethane/Polypropylene Blends Prepared with Vane Extruder

Abstract

Thermoplastic polyurethane (TPU)/polypropylene (PP) blends with different weight ratios were prepared in a novel vane extruder generating global and dynamic elongational flow. The results indicated that the addition of TPU elastomer to PP significantly improved the mechanical properties of the blends. From the SEM micrographs it could be clearly observed dispersed TPU deformed to be fibers by the effect of elongational flow. Meanwhile the results observed from DSC curves revealed apparent partial miscibility of the blends and enhanced crystallization ability of PP due to the influence of elongational flow