Abstract: Thermoplastic polyurethane(TPU) was blended with three elastomers separately,ethylene propylene-diene monomer elastomer (EPDM)，polyethylene-co-1-octylene) (POE),and styrene buta- diene-styrene triblock copolymer(SBS)，via melt blending. The morphology, mechanical and rheologi cal properties were investigated. Scanning electronic micrograph revealed a bi-continuous morphology, in which the elastomer domain formed a network in TPU matrix, which enhanced the mechanical proper- ties.Such interlocked structure also increased the torques of the blending melts.

Key words: thermoplastic , polyurethane; , polyolefin , elastomer; , ethylene-propylene-dime monomer ;ethylene-co-l-octylene copolymer, styrene-butadiene-styrene triblock copolymer, blend structure