Droplet deformation in polymer blends during uniaxial elongational flow: Influence of viscosity ratio for large capillary numbers

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Abstract
The deformation in uniaxial elongational flow of dispersed droplets in immiscible molten polymer blends was studied for viscosity ratios 0.005<p=η(drop)/η(matrix)<13 and negligible interfacial tension, with an original method based on quenching elongated specimens. Although drop deformations (drop major axis over initial diameter) were in the range 1≤λ d ≤5, good overall agreement was found with the small deformation Newtonian theory, which predicts that the drop versus matrix deformation ranges from 5/3 to 0 when p increases from 0 to infinity. The theoretical prediction that for p lower than 1, the droplet should deform more than the faraway surrounding matrix, with a limiting ratio of 5/3 at vanishing dropletviscosity, was verified both experimentally and numerically with a finite element simulation.

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