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Liquid-liquid phase separation in concentrated solutions of non-crystallizable polymers by spinodal decomposition

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Summary

Two mechanisms of liquid-liquid phase separation in polymer solutions are possible: nucleation and growth of one of the equilibrium phases, and decomposition by a spinodal mechanism. The conditions for and characteristics of both mechanisms are discussed. By combining a number of observations on phase separation in concentrated solutions of poly(2,6-dimethyl-1,4-phenylene ether) and of an ethylene — vinyl acetate copolymer in caprolactam, it becomes clear that a spinodal mechanism is operative at the onset of the separation process. In later stages the flow properties of the concentrated polymer phase determine the final state of the separated mixture.

Zusammenfassung

Zwei Mechanismen der flüssig-flüssig Phasentrennung in Polymerlösungen sind möglich: 1. Keimbildung und Wachstum einer der Gleichgewichtsphasen und 2. Auftrennung durch einen spinodalen Mechanismus. Die Bedingungen für und das Charakteristische beider Mechanismen wird diskutiert. Durch Kombination einer Zahl von Beobachtungen auf die Phasentrennung in konzentrierten Lösungen aus Poly(2,6-dimethyl-1,4-phenylenäther) und einem Äthylen-vinyl-acetatcopolymer in Caprolactam wird klar, daß ein spinodaler Mechanismus bei Einsatz des Trennprozesses wirksam wird. In späteren Stadien bestimmen die Fließeigenschaften der konzentrierten polymeren Phase den endgültigen Zustand der getrennten Mischung.

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Author notes

  1. J. J. van Aartsen & A. Steenbergen

    Present address: AKZO Research Laboratories Arnhem, The Netherlands

  2. C. A. Smolders

    Present address: Technological University Twente Enschede, The Netherlands

Authors and Affiliations

  1. AKZO Research Laboratories Arnhem, The Netherlands

    C. A. Smolders

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  1. C. A. Smolders
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  2. J. J. van Aartsen
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  3. A. Steenbergen
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Smolders, C.A., van Aartsen, J.J. & Steenbergen, A. Liquid-liquid phase separation in concentrated solutions of non-crystallizable polymers by spinodal decomposition. Kolloid-Z.u.Z.Polymere 243, 14–20 (1971). https://doi.org/10.1007/BF01500609

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