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Flocculation studies of non-aqueous poly(methyl methacrylate) dispersions stabilized by AB block copolymers of polystyrene and poly(dimethyl siloxane)

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  • Colloid Science
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Summary

Well defined non-aqueous dispersions of poly(methyl methacrylate) stabilized by AB block copolymers of polystyrene and poly(dimethyl siloxane) were prepared with a dispersion medium consisting of a binary mixture of n-heptane and ethanol. Flocculation was induced by cooling, and the lower critical flocculation temperature was studied as a function of the molecular weight and composition of the stabilizing copolymer, the particle size of the dispersion, and the surface coverage of the particles. The theta temperature for poly(dimethyl siloxane) homopolymer in the same binary liquid mixture was determined by two procedures. The lower critical flocculation temperature was found to be close to the theta temperature and was independent of the length of the stabilizing poly(dimethyl siloxane) chains for the molecular weight range 3200-48000.

Zusammenfassung

Gut definierte, durch AB-Block-Copolymere von Polystyrol und Polydimethylsiloxan stabilisierte nichtwässerige Dispersionen von Polymethylmethacrylat wurden mit binären Mischungen von Heptan und Äthylalkohol als Dispersionsmittel hergestellt. Die Flockung wurde durch Abkühlung herbeigeführt und die untere kritische Flockungstemperatur wurde als Funktion des Molekulargewichts und der Zusammensetzung des stabilisierenden Copolymeren, der Größe der dispergierten Teilchen und dem Bedeckungsgrad der Teilchenoberfläche studiert. Die Theta-Temperatur des Polydimethylsiloxan-Homopolymers in derselben binären flüssigen Mischung wurde durch zwei Verfahren bestimmt. Es wurde gefunden, daß die untere kritische Flockungstemperatur nahe an der ThetaTemperatur liegt und im Molekulargewichtsbereich 3200–48000 von der Länge der stabilisierenden Polydimethylsiloxan-Ketten unabhängig ist.

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Authors and Affiliations

  1. Department of Chemistry, Loughborough University of Technology, LE 11 3 TU, Loughborough, Leicestershire, England

    J. V. Dawkins

  2. Unilever Research Port Sunlight, L62 4XN, Wirral, Merseyside, England

    G. Taylor

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  1. J. V. Dawkins
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  2. G. Taylor
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Dawkins, J.V., Taylor, G. Flocculation studies of non-aqueous poly(methyl methacrylate) dispersions stabilized by AB block copolymers of polystyrene and poly(dimethyl siloxane). Colloid & Polymer Sci 258, 79–84 (1980). https://doi.org/10.1007/BF01474957

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  • DOI: https://doi.org/10.1007/BF01474957

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