Our objective is to understand the relations between resultant blend morphology and its thermodynamic variables, rheological properties and processing conditions. If the proposed relations are available, then for a given polymer pairs in which we know the rheological properties and the processing conditions to be used, we can predict droplet size (mean value). The mean droplet size then can be used to predict several mechanical properties of the final solid state blend. Specifically, we will investigate the unexplored oscillatory flow mode on the deformation, relaxation, breakup, and coalescence processes.