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Polymer alloy is a process of polymer modification.Its could be increase the properties of matrix polymer.Polypropylene was a hydrophobic polymer.We could increase the hydrophilic property of polypropylene by using polymer alloy with polyvinyl alcohol.In this research, we try to analyze the morphology of blend with polypropylene and polyvinyl alcohol.The viscosity ratio is an important parameter for polymer alloy and, which could be assuming the morphology of polymer blend on the manufacture process.