Immiscible blend morphology after shear and elongation

This work examines the role of shear and extensional strain on immiscible blend morphology, namely domain size, orientation, and co-continuity. The domain size reduces with surface tension similar to what is observed with isolated droplets. The domain size is shown to increase with shear strain due...

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Format: Conference Proceeding
Language:English
Subjects:
Coalescing
Dependence
Draw ratio
Droplets
Elongation
Extrusion
Miscibility
Morphology
Shear strain
Surface tension
Transformations
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description This work examines the role of shear and extensional strain on immiscible blend morphology, namely domain size, orientation, and co-continuity. The domain size reduces with surface tension similar to what is observed with isolated droplets. The domain size is shown to increase with shear strain due to coalescence. Hence the best mixing is found with low shear strains, i.e. low rates of shear and short durations of time. Extensional strain (extrusion draw ratio DR) reduces phase width and thickness with a DR−0.5 dependence, suggesting the transformation to a fibrilar morphology. The critical draw ratio for morphology transformation is approximately 7, in agreement with observations by Grace for droplet breakup in elongation. Fibrilar morphology is also consistent with a large increase in strain-to-break in the drawn film and with observed creep and optical scattering behavior.
doi_str_mv 10.1063/1.4918470
format conference_proceeding
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source American Institute of Physics:Jisc Collections:Transitional Journals Agreement 2021-23 (Reading list)
subjects Coalescing
Dependence
Draw ratio
Droplets
Elongation
Extrusion
Miscibility
Morphology
Shear strain
Surface tension
Transformations
title Immiscible blend morphology after shear and elongation
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