In Situ Visualization of Drop Deformation, Erosion, and Breakup in High Viscosity Ratio Polymeric Systems Under High Shearing Stress Conditions

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DOIResolve DOI: http://doi.org/10.1002/app.22744
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TypeArticle
Journal titleJournal of Applied Polymer Science
ISSN1097-4628
0021-8995
Volume100
Issue4
Pages25822591; # of pages: 9
Subjectshearing flow visualization; high viscosity ratio; drop deformation; drop breakup; dispersion by surface erosion mechanism
AbstractIn this paper, deformation and breakup under simple shear of single molten polymer drops in a polymer matrix were investigated. Flow visualization was carried out in a Couette-Flow apparatus under relatively high shear rates and temperatures up to 230°C. Drop/Matrix combinations were composed of polystyrene drops of 0.5– 0.6 mm in diameter in polyethylene matrix, and ethylene– propylene copolymer drops of approximately the same size in polypropylene matrix. The deformation and breakup processes were studied under steady state and time-dependent shearing conditions. Either for steady state or time-dependant shearing conditions, drop elasticity generated at relatively high shear rates helped the drops to align perpendicular to the flow direction, i.e., parallel to vorticity axis. Also, the most striking non-Newtonian effects for the high viscosity ratio systems were the surface erosion and the drop splitting mechanisms. The particles eroded off the main droplet surface were very fine, in the range of 10–50 m, and led to a significant reduction in main drop size before its final breakup.
Publication date
PublisherJohn Wiley and Sons
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Industrial Materials Institute
Peer reviewedYes
NRC number53753
NPARC number15930970
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Record identifier30102174-cf7a-44e3-b76d-ae78e0aae419
Record created2010-08-17
Record modified2016-05-09
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