Zahra Zamani - Department of Polymer Engineering, Faculty of Engineering, Qom University of Technology, P.O. Box: ۳۷۱۹۵-۱۵۱۹, Qom, Iran.
Mohsen Mohammadi - Department of Polymer Engineering, Faculty of Engineering, Qom University of Technology, P.O. Box: ۳۷۱۹۵-۱۵۱۹, Qom, Iran.
Jafar Khademzadeh Yeganeh - Department of Polymer Engineering, Faculty of Engineering, Qom University of Technology, P.O. Box: ۳۷۱۹۵-۱۵۱۹, Qom, Iran.
Hamed Azizi - Department of Plastics Engineering, Faculty of Polymer Processing, Iran Polymer and Petrochemical Institute, P.O. Box: ۱۴۹۶۵-۱۱۵, Tehran, Iran.

Poly(lactic acid) (PLA) and poly(έ -caprolactone) were melt blended using an internal mixer. The morphology of PLA/PCL blends was observed by scanning electron microscopy (SEM). The linear rheological behavior of PLA/PCL blends were investigated at strain 1%. The results show the clear phase separation for immiscible PLA/PCL blend where PCL disperses evenly in PLA matrix that size of PCL particle increase with addition of PCL content. Linear viscoelastic behavior shows that Newtonian behavior at low frequency and shear thinning behavior with addition frequency value. With addition PCL to PLA matrix shear thinning behavior observed nearly, storage modulus, loss modulus increase. In the other hand, complex viscosity of PLA/PCL increase because PCL has higher viscosity rather than PLA.

polymer blends, rheology, poly (lactic) acid, poly(έ-caprolactone)