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|Title:||Erosion and Breakup of Polymer Drops Under Simple Shear in High Viscosity Ratio Systems|
|Authors:||Lin, B;Sundararaj, U;Mighri, F;Huneault, MA|
|subject:||Deformation;Differential Scanning Calorimetry;Drop Breakup;Erosion;Flow Visualization;High Temperature Effects;Least Squares Approximations;Polymer Blends;Regression Analysis;Shear Flow;Viscosity;Vortex Flow|
|Publisher:||John Wiley & Sons, Inc. The Journal's web site is located at http://www.4spe.org/periodicals/journals/pes.htm|
|Description:||The deformation and breakup of a single polycarbonate (PC) drop in a polyethylene (PE) matrix were studied at high temperatures under simple shear flow using a specially designed transparent Couette device. Two main breakup modes were observed: (a) erosion from the surface of the drop in the form of thin ribbons and streams of droplets and (b) drop elongation and drop breakup along the axis perpendicular to the velocity direction. This is the first time drop breakup mechanism (a), "erosion," has been visualized in polymer systems. The breakup occurs even when the viscosity ratio (ηr) is greater than 3.5, although it has been reported that breakup is impossible at these high viscosity ratios in Newtonian systems. The breakup of a polymer drop in a polymer matrix cannot be described by Capillary number and viscosity ratio only; it is also controlled by shear rate, temperature, elasticity and other polymer blending parameters. A pseudo first order decay model was used to describe the erosion phenomenon and it fits the experimental data well.|
|Standard no:||Polymer Engineering and Science, 2003, v. 43 n. 4, p. 891-904|
|Appears in Collections:||Department of Anatomy|
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