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Studies on preparation and stability of styrene-methyl methacrylate and styrene -methacrylic acid copolymer latices

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Summary

Series of styrene-methyl methacrylate (SM) and styrene-methacrylic acid (SA) copolymer latices have been prepared by emulsion polymerization using polyoxyethylene nonyl phenyl ether as emulsifier and potassium persulphate as initiator. Trace carboxyl groups were detected both in polystyrene latex and styrene-methyl methacrylate copolymer latices. The stability and electrophoretic behaviour of these latices against barium chloride have been investigated. The values of the critical coagulation concentration (c. c. c.) increased with increasing methacrylic acid content for SA series latices, while they are almost independent of methyl methacrylate content for SM series latices. The effects of methyl methacrylate and methacrylic acid on the change in Hamaker constant were found to be almost identical. The difference inc. c. c. between SM and SA series latices seems to be due to the difference in electrical repulsion caused mainly by carboxyl groups on the surface.

Zusammenfassung

Eine Serie der Styrol-Methyl-Methacrylat (SM) und Styrol-Methacrylsäure (SA) Mischpolymer-Latices wurde unter Verwendung von Polyoxyäthylennonylphenyläther als oberflächenaktives Agents und Kaliumpersulfat als Initiator von Emulsionspolymerisation hergestellt. Wenige Carboxylgruppen in beiden Polystyrol-Latex-und Styrol-Methyl-Methacrylat-Mischpolymer-Latices wurden gefunden. Stabilität und elektrophoretische Beweglichkeit dieser Latices gegen Bariumchlorid würden untersucht. Die Werte der kritischen Koagulaiionskonzentration (k. k. k.) nahm mit Zunahme des Gehaltes an Methacrylsäure für SA-Latices zu, während sie fast unabhängig vom Gehalt an Methyl-Methycrylat für SM-Latices sind. Die Wirkungen des Methyl-Methacrylats und der Methacrylsäure auf die Änderung der Hamaker Konstante sind meistens identisch. Der Unterschied in k. k. k. zwischen SM- und SA-Latices scheint hauptsächlich auf den Unterschied in der elektrischen Abstoß durch Carboxylgruppen auf der Oberfläche zuzückgeführt werden zu können.

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Authors and Affiliations

  1. Central Research Laboratory, Mitsubishi Electric Corporation, 80, Nakano, Minamishimizu, Amagasaki, 661, Hyogo, Japan

    H. Ono, E. Jidai & K. Shibayama

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  1. H. Ono
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  2. E. Jidai
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  3. K. Shibayama
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With 4 figures, and 2 tables

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Ono, H., Jidai, E. & Shibayama, K. Studies on preparation and stability of styrene-methyl methacrylate and styrene -methacrylic acid copolymer latices. Colloid & Polymer Sci 255, 105–110 (1977). https://doi.org/10.1007/BF01777269

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  • DOI: https://doi.org/10.1007/BF01777269

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