Visualization of morphology development in polymer blends

L. Levitt, C. W. Macosko, S. D. Pearson

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 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 (x3) to the flow direction (x1). 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)
Title of host publicationSpecial Areas
PublisherSoc of Plastics Engineers
Number of pages6
StatePublished - Dec 1 1996
EventProceedings of the 1996 54th Annual Technical Conference. Part 3 (of 3) - Indianapolis, IN, USA
Duration: May 5 1996May 10 1996


OtherProceedings of the 1996 54th Annual Technical Conference. Part 3 (of 3)
CityIndianapolis, IN, USA


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