Shear effect on the phase behavior and morphology in PMMA/SAN-29.5 blend

Samy A. Madbouly, Tsuneo Chiba, Toshiaki Ougizawa, Takashi Inoue

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The effect of simple shear flow on the miscibility and morphology of blends of poly(methyl methacrylate) (PMMA) and a styrene-acrylonitrile random copolymer with 29.5 wt% acrylonitrile (SAN-29.5) has been investigated using shear apparatus and transmission electron microscopy (TEM). The obtained data showed that only shear-induced mixing was observed for all of the composition ratios. The increase of the cloud point (or homogenization temperature) ΔT(qq) = T(qq) - T(0) was investigated as a function of shear rate qq; in addition, the normalized shift in the cloud point ΔT(qq)/T(0) versus qq was also studied and compared with that of simple liquid mixtures and polymer solutions. The results showed that the polymer blends were more sensitive to the shear rate than both simple-liquid mixtures and polymer solutions. The morphology of the PMMA/SAN(= 75/25) blend (the critical composition) indicated that shear-induced phase mixing occurred at a critical shear rate value, below which the two phases were highly oriented and elongated in the flow direction. Three regimes, depending on the applied shear rate values, were detected that were in good agreement with the literature data for polymer solutions. The effect of relaxation times after shear cessation showed a decrease in the orientation of the elongated particles, but it did not completely vanish even for 10 min after the shear cessation.

Original languageEnglish (US)
Pages (from-to)79-92
Number of pages14
JournalJournal of Macromolecular Science - Physics
VolumeB38
Issue number1-2
StatePublished - Jan 1 1999

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Polymethyl Methacrylate
Phase behavior
Polymethyl methacrylates
polymethyl methacrylate
Shear deformation
Polymer solutions
Acrylonitrile
shear
Styrene
Liquids
Polymer blends
Shear flow
acrylonitriles
Chemical analysis
Relaxation time
Copolymers
Solubility
polymers
Transmission electron microscopy
polymer blends

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Polymers and Plastics
  • Materials Chemistry

Cite this

Madbouly, Samy A. ; Chiba, Tsuneo ; Ougizawa, Toshiaki ; Inoue, Takashi. / Shear effect on the phase behavior and morphology in PMMA/SAN-29.5 blend. In: Journal of Macromolecular Science - Physics. 1999 ; Vol. B38, No. 1-2. pp. 79-92.
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abstract = "The effect of simple shear flow on the miscibility and morphology of blends of poly(methyl methacrylate) (PMMA) and a styrene-acrylonitrile random copolymer with 29.5 wt{\%} acrylonitrile (SAN-29.5) has been investigated using shear apparatus and transmission electron microscopy (TEM). The obtained data showed that only shear-induced mixing was observed for all of the composition ratios. The increase of the cloud point (or homogenization temperature) ΔT(qq) = T(qq) - T(0) was investigated as a function of shear rate qq; in addition, the normalized shift in the cloud point ΔT(qq)/T(0) versus qq was also studied and compared with that of simple liquid mixtures and polymer solutions. The results showed that the polymer blends were more sensitive to the shear rate than both simple-liquid mixtures and polymer solutions. The morphology of the PMMA/SAN(= 75/25) blend (the critical composition) indicated that shear-induced phase mixing occurred at a critical shear rate value, below which the two phases were highly oriented and elongated in the flow direction. Three regimes, depending on the applied shear rate values, were detected that were in good agreement with the literature data for polymer solutions. The effect of relaxation times after shear cessation showed a decrease in the orientation of the elongated particles, but it did not completely vanish even for 10 min after the shear cessation.",
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Shear effect on the phase behavior and morphology in PMMA/SAN-29.5 blend. / Madbouly, Samy A.; Chiba, Tsuneo; Ougizawa, Toshiaki; Inoue, Takashi.

In: Journal of Macromolecular Science - Physics, Vol. B38, No. 1-2, 01.01.1999, p. 79-92.

Research output: Contribution to journalArticle

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