Flow Curves of Mixtures of Acrylonitrile-Styrene Copolymers with Different Molecular Weights at Extremely High Shear Rates

Hideroh Takahashi, Yoshinori Inoue, Satoru Yamamoto, Osami Kamigaito

Research output: Contribution to journalArticlepeer-review

Abstract

The flow curves of mixtures of acrylonitrile—styrene copolymers with the same S/AN ratio (70/30) and different molecular weights (SAN-1; Mw= 1.88 X 105, SAN-2; Mw = 6.5 X 104) were measured up to the shear rate of 107 s ~ l. The second Newtonian and the second non-Newtonian region were observed for SAN-1, SAN-2, and their mixtures (< 106s-1) following the first non-Newtonian region. The viscosity decreased with decrease of molecular weight (increase of SAN-2 content) and the gradient of the flow curve (log viscosity vs log shear rate) of the mixture became smaller with decrease of molecular weight in the first non-Newtonian region. Flow behavior of the mixture was quite different from that of the immiscible polymer blends. The flow curves of SAN with different molecular weights (> 1.28 x 10s) united into one curve at the shear rates higher than 5 x 10ss _ l.

Original languageEnglish
Pages (from-to)706
Number of pages1
JournalJournal of Rheology
Volume35
Issue number4
DOIs
Publication statusPublished - May 1991
Externally publishedYes

All Science Journal Classification (ASJC) codes

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

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