Immiscible blend morphology after shear and elongation

Gibson L. Batch, Milana Trifkovic, Aaron Hedegaard, Chris Macosko

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

1 Scopus citations

Abstract

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 thickneb 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.

Original languageEnglish (US)
Title of host publicationProceedings of PPS-30
Subtitle of host publicationThe 30th International Conference of the Polymer Processing Society - Conference Papers
EditorsSadhan C. Jana
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735413092
DOIs
StatePublished - May 22 2015
Event30th International Conference of the Polymer Processing Society, PPS 2014 - Cleveland, United States
Duration: Jun 6 2014Jun 12 2014

Publication series

NameAIP Conference Proceedings
Volume1664
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other30th International Conference of the Polymer Processing Society, PPS 2014
CountryUnited States
CityCleveland
Period6/6/146/12/14

Keywords

  • Blends
  • Extensional Flow
  • Morphology
  • Polymer Procebing

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