Rheological properties and domain structures of immiscible polymer blends under steady and oscillatory shear flows

Shinichi Kitade, Akihiro Ichikawa, Naotomo Imura, Yoshiaki Takahashi, Ichiro Noda

Research output: Contribution to journalArticle

71 Citations (Scopus)

Abstract

Rheological properties of three immiscible polyisoprene (PI)/polydimethylsiloxane (PDMS) blends (PI:PDMS = 1:9 by weight) having viscosity ratios ηdm = 0.155, 0.826, and 4.02, where ηd and ηm are the viscosities of the droplet and matrix, were investigated by directly measuring the droplet size distributions with a video microscope. Steady state measurements were performed by sequentially stepping up the shear rate γ̇ (step-up) and step decrease (step-down) of the shear rate. Dynamic frequency sweep measurements were also performed immediately following cessation of steady shear flow. In the step-up measurements for blends with ηdm = 0.155 and 0.826, stresses were proportional to γ̇ and the droplet sizes were well regulated by the flow and inversely proportional to γ̇ for γ̇ ≥ 0.553 s-1, in good agreement with the Doi-Ohta model [J. Chem. Phys. 95, 1242-1248 (1991)]. The results of step-down measurements were consistent with dynamic moduli measurements, because the droplet sizes were almost unchanged during these measurements. The results are in accord with Palierne's model [Rheol. Acta 29, 204-214 (1990)]. For the ηdm = 4.02 blend, however, the droplet sizes were insensitive to γ̇, resulting in worse agreement between the experimental and theoretical results than for the other blends.

Original languageEnglish
Pages (from-to)1039-1060
Number of pages22
JournalJournal of Rheology
Volume41
Issue number5
DOIs
Publication statusPublished - Jan 1 1997
Externally publishedYes

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polymer blends
Polymer blends
Shear flow
shear flow
Polyisoprenes
polyisoprenes
Polydimethylsiloxane
Shear deformation
Viscosity
viscosity
shear
sweep frequency
Microscopes
microscopes
matrices

All Science Journal Classification (ASJC) codes

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

Cite this

Rheological properties and domain structures of immiscible polymer blends under steady and oscillatory shear flows. / Kitade, Shinichi; Ichikawa, Akihiro; Imura, Naotomo; Takahashi, Yoshiaki; Noda, Ichiro.

In: Journal of Rheology, Vol. 41, No. 5, 01.01.1997, p. 1039-1060.

Research output: Contribution to journalArticle

Kitade, Shinichi ; Ichikawa, Akihiro ; Imura, Naotomo ; Takahashi, Yoshiaki ; Noda, Ichiro. / Rheological properties and domain structures of immiscible polymer blends under steady and oscillatory shear flows. In: Journal of Rheology. 1997 ; Vol. 41, No. 5. pp. 1039-1060.
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