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In-Situ Visualization of Novel Polymer Droplet Morphologies During Extrusion



Erik K. Hobbie, Kalman Migler


We report the observation of novel droplet morphologies in the high stress layers near the walls of a specially instrumented slit die. We utilize in-situ optical microscopy to study a dilute blend of polystyrene (PS) in a polyethylene (PE) matrix. At low shear rates the PS droplets become elliptical with the long axis of shear, in agreement with a great body of experimental work. At high shear rates we observe a transition in which the droplets develop cusps in the directions parallel and perpendicular to flow. Rheological measurements indicate the importance of normal forces at these high shear rates.
Conference Dates
May 1, 1998
Conference Location
Conference Title
Society of Plastics Engineers


blend, morphology, polymer, processing, rheology


Hobbie, E. and Migler, K. (2008), In-Situ Visualization of Novel Polymer Droplet Morphologies During Extrusion, Society of Plastics Engineers, Undefined (Accessed April 25, 2024)
Created October 16, 2008