Influence of normal stress difference on polymer drop deformation

Leon Levitt, Chris Macosko, Scott D. Pearson

Research output: Contribution to journalArticlepeer-review

135 Scopus citations


Polypropylene drops of varying viscosity and elasticity were sheared in a polystyrene matrix. Two transparent, counter-rotating parallel disks provided simple shear flow. By adjusting the speed of one disk the drop center was fixed in the laboratory frame and deformation followed via high magnification video camera. It was found that with high matrix elasticity drops of the minor phase stretched perpendicular (χ3) to the flow direction (χ1). This is the first report of widening of drops in shear flow. An analytical relation was established between the second normal stress differences of the phases and degree of widening. The formation of sheets and the phenomena of widening results in a larger than affine area generation.

Original languageEnglish (US)
Pages (from-to)1647-1655
Number of pages9
JournalPolymer Engineering and Science
Issue number12
StatePublished - Jan 1 1996


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