Prediction of phase-separated regions in ternary blends composed of three miscible binary copolymer pairs

J. M G Cowie, Guangxian Li, I. J. McEwen

Research output: Contribution to journalArticle

Abstract

The phase behaviour of ternary copolymer blends poly(styrene-stat-acrylonitrile) (SAN)/poly(methyl methacrylate-stat-acrylonitrile) (MAN)/poly(N-phenylitaconimide-stat-methyl methacrylate) (PIMMMA) was analysed using Flory-Huggins theory. The system studied consists of the combination of three binary pairs SAN/MAN, SAN/PIMMMA and MAN/PIMMMA, and it has been demonstrated that the combination of these three miscible pairings cannot guarantee the formation of a single-phase ternary blend. Phase-separated regions in ternary space can appear at compositions defined by the miscible windows of the binary pairings, provided that the difference in the interactions between them is large. When the molecular weights of the three polymers are unequal, it is suggested that a modified term ??' = (?'13 - ?'12) is used to replace the normal ??, in order to reflect the influence of molecular weight on the asymmetry of the interactions between the different binary polymer pairs. The new term ?'ij = (?ijcrit - ?ij), where ?ijcrit > ?ij, is the difference between the critical interaction parameter and the corresponding normal interaction parameter of the i-j pair. It will equal the original expression for ?? only when the component molecular weights are equal. © 1994 Butterworth-Heinemann Ltd.

Original languageEnglish
Pages (from-to)5518-5522
Number of pages5
JournalPolymer
Volume35
Issue number25
Publication statusPublished - 1994

Fingerprint

Methacrylates
Acrylonitrile
Copolymers
Styrene
Molecular weight
Polymers
Polymethyl Methacrylate
Phase behavior
Chemical analysis

Keywords

  • copolymer
  • Flory-Huggins theory
  • ternary blends

Cite this

Cowie, J. M G ; Li, Guangxian ; McEwen, I. J. / Prediction of phase-separated regions in ternary blends composed of three miscible binary copolymer pairs. In: Polymer. 1994 ; Vol. 35, No. 25. pp. 5518-5522.
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abstract = "The phase behaviour of ternary copolymer blends poly(styrene-stat-acrylonitrile) (SAN)/poly(methyl methacrylate-stat-acrylonitrile) (MAN)/poly(N-phenylitaconimide-stat-methyl methacrylate) (PIMMMA) was analysed using Flory-Huggins theory. The system studied consists of the combination of three binary pairs SAN/MAN, SAN/PIMMMA and MAN/PIMMMA, and it has been demonstrated that the combination of these three miscible pairings cannot guarantee the formation of a single-phase ternary blend. Phase-separated regions in ternary space can appear at compositions defined by the miscible windows of the binary pairings, provided that the difference in the interactions between them is large. When the molecular weights of the three polymers are unequal, it is suggested that a modified term ??' = (?'13 - ?'12) is used to replace the normal ??, in order to reflect the influence of molecular weight on the asymmetry of the interactions between the different binary polymer pairs. The new term ?'ij = (?ijcrit - ?ij), where ?ijcrit > ?ij, is the difference between the critical interaction parameter and the corresponding normal interaction parameter of the i-j pair. It will equal the original expression for ?? only when the component molecular weights are equal. {\circledC} 1994 Butterworth-Heinemann Ltd.",
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Prediction of phase-separated regions in ternary blends composed of three miscible binary copolymer pairs. / Cowie, J. M G; Li, Guangxian; McEwen, I. J.

In: Polymer, Vol. 35, No. 25, 1994, p. 5518-5522.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Prediction of phase-separated regions in ternary blends composed of three miscible binary copolymer pairs

AU - Cowie, J. M G

AU - Li, Guangxian

AU - McEwen, I. J.

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N2 - The phase behaviour of ternary copolymer blends poly(styrene-stat-acrylonitrile) (SAN)/poly(methyl methacrylate-stat-acrylonitrile) (MAN)/poly(N-phenylitaconimide-stat-methyl methacrylate) (PIMMMA) was analysed using Flory-Huggins theory. The system studied consists of the combination of three binary pairs SAN/MAN, SAN/PIMMMA and MAN/PIMMMA, and it has been demonstrated that the combination of these three miscible pairings cannot guarantee the formation of a single-phase ternary blend. Phase-separated regions in ternary space can appear at compositions defined by the miscible windows of the binary pairings, provided that the difference in the interactions between them is large. When the molecular weights of the three polymers are unequal, it is suggested that a modified term ??' = (?'13 - ?'12) is used to replace the normal ??, in order to reflect the influence of molecular weight on the asymmetry of the interactions between the different binary polymer pairs. The new term ?'ij = (?ijcrit - ?ij), where ?ijcrit > ?ij, is the difference between the critical interaction parameter and the corresponding normal interaction parameter of the i-j pair. It will equal the original expression for ?? only when the component molecular weights are equal. © 1994 Butterworth-Heinemann Ltd.

AB - The phase behaviour of ternary copolymer blends poly(styrene-stat-acrylonitrile) (SAN)/poly(methyl methacrylate-stat-acrylonitrile) (MAN)/poly(N-phenylitaconimide-stat-methyl methacrylate) (PIMMMA) was analysed using Flory-Huggins theory. The system studied consists of the combination of three binary pairs SAN/MAN, SAN/PIMMMA and MAN/PIMMMA, and it has been demonstrated that the combination of these three miscible pairings cannot guarantee the formation of a single-phase ternary blend. Phase-separated regions in ternary space can appear at compositions defined by the miscible windows of the binary pairings, provided that the difference in the interactions between them is large. When the molecular weights of the three polymers are unequal, it is suggested that a modified term ??' = (?'13 - ?'12) is used to replace the normal ??, in order to reflect the influence of molecular weight on the asymmetry of the interactions between the different binary polymer pairs. The new term ?'ij = (?ijcrit - ?ij), where ?ijcrit > ?ij, is the difference between the critical interaction parameter and the corresponding normal interaction parameter of the i-j pair. It will equal the original expression for ?? only when the component molecular weights are equal. © 1994 Butterworth-Heinemann Ltd.

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