Viscoelastic properties of immiscible polymer blends consisting of polystyrene and poly(2-vinylpyridine), both of which have almost the same viscoelastic properties are studied under steady shear flow in linear and non-linear regions for the viscoelastic properties of components. It was observed that shear rate dependence of shear viscosity of blend samples was the same as those of component homopolymers, implying that the excess shear stress is proportional to the shear rate in the linear and non-linear regions for component polymers. It was also observed that the excess first normal stress difference of the blends was also proportional to the shear rate. It is concluded that the scaling relations between the excess stresses and the shear rate observed for binary immiscible polymer blends consisting of components with similar Newtonian viscosities can be extended into the higher shear rate regions where the components show similar non-linear viscoelastic behaviors.
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