Abstract: The binary blends of liquid crystalline copolyesteramide(PEA) and poly(ethyleneterephthalate, PET) were studied by Instron3211 type capillary rheometer, The spinnability of the blend melts was inverstigated based on their rheological properties- The relationship between the mechanical properties and structure was discussed. The results show that the viscosity of blends is lower than that of PETand there is a minimum of viscosity at 10%PEAcontent. When the content of PEAis less than 10%, the blends are well-spinnable,and the composite fibers have a well-developed highly oriented fibrillar structure along the fiber axis. As the PEAis 5%, good in-situ reinforcement can be obtained.

Key words: Liquid crystalline copolyesteramide, Poly(ethylene terephthalate), Blends, Rheology, In-sltu reinforcement