Abstract
The object of this study was to clarify some aspects of the mechanism of shear-induced flocculation in colloidal dispersions. Vinyl chloride homopolymer and copolymer latices were prepared by emulsion polymerization using sodium dodecyl sulphate as emulsifier. Agglomeration behavior in these latices was studied by measuring the mechanical stability using a high speed stirring test. The latex particle size was measured by an analytical centrifuge. Molecular areas of emulsifier in the saturated adsorption layer at the surface of homopolymer and copolymer latex particles were estimated from adsorption titration data. Experimental Materials. All monomers were of commercial quality: vinyl chloride (VCM), vinyl acetate and VeoVa 10. The latter is a vinyl ester of a saturated monocarboxylic acid with a highly branched structure containing 10 carbon atoms. This monomer is produced by Shell Chemicals. The emulsifier, sodium dodecyl sulphate (SDS), was the commercial material Berol 474 from Berol Kemi, Sweden. Na2S2O8 supplied by
Published Version
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