Formation of Ultrafine Polymer Latex by Emulsion Polymerysation Process

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  • 乳化重合法による超微粒子ポリマーラテックスの生成
  • ニュウカ ジュウゴウホウ ニヨル チョウ ビリュウシ ポリマー ラテックス ノ

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Abstract

Some problems in the formation of poly (methyl methacrylate) latex with very fine particles have been investigated. Transparent polymer latices having particle sizes of approximately 0.02-0.03μ diameter were produced by use of sodium lauryl sulfate as an emulsifier and by adding a small amount of cupric ion in a K2S2O6-Na2S2O3 redox initiating system. When a very fine polymer latex is produced by emulsion polymerisation nuder conventional conditions, the latex viscosity usually increases up to several hundred thousand centi poise in the gel state. It was found that the addition of an electrolyte of a limited concentration to the ultrafine polymer latex remarkably reduced the apparent viscosity: the viscosity of more than several hundred thousand centi poise was decreased to about several centi poise. Change in the fluidizing character of the latex with very high viscosity by the electrolyte addition can be explained by means of destruction of an ice-like hydration shell with sufficient thickness for the close-packing and of the concept of the effect of particle spacing on the latex viscosity introduced by the Kelsey's calculation method.

Journal

  • KOBUNSHI RONBUNSHU

    KOBUNSHI RONBUNSHU 36 (11), 729-737, 1979

    The Society of Polymer Science, Japan

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