Examination of condition for fine structure of immiscible polymer blends step change of shear rate

Yoshiaki Takahashi, Masanao Suzuki, Ichiro Noda

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2 Citations (Scopus)

Abstract

Effective flow conditions for making fine structure of a model immiscible polymer blend, i.e., equiviscous immiscible polymer blend was examined by using interrupted flow and combination of step increase and decrease of shear rate. Overshoot peak of first normal stress difference, which corresponds to the existence of most elongated domains, was used as an indicator for changing shear rate. That is, shear rate was decreased (including zero shear rate) just after the overshoot peak of first normal stress difference appeared. Time needed to rupture the elongated domains and also droplet size and distributions thus obtained were compared to the data evaluated by using shear flow with step increase of shear rate. The time needed to rupture the domain with interrupted flow and combination of step increase and decrease of shear rate was shorten to be one fifth and the size of domains and their distribution were almost the same compared to corresponding data for flow with step increase of shear rate. It was concluded that decreasing of shear rate at the most elongated state of domain structure is an effective procedure to make fine structure of immiscible polymer blends.

Original languageEnglish
Pages (from-to)1286-1290
Number of pages5
JournalZairyo/Journal of the Society of Materials Science, Japan
Volume49
Issue number12
DOIs
Publication statusPublished - Dec 2000

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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