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Information Journal Paper

Title

ON THE SPECIFIC RESISTANCE OF CAKES OF LATEXES

Writers

MADAENI S.S.

Pages

 Start Page 177 | End Page 184

Abstract

 In the ultrafiltration of latex particles, a cake is formed on the membrane surface. This cake consists of latex particles and small size surfactants which are used to stabilize the colloidal latex. The resistance of this cake is high due to filling of the voidage between the latex particles by the surfactant, so the measured specific resistance cannot be considered as the property of the latex beads. A membrane with a pore size large enough-to: allow the passage of small surfactants can negate the presence of the surfactant on the specific resistance of the latex cake layer. Estimated specific resistances of the latex cake on the surface of the PM30 ultrafilter and the Nuclepore microfilter have been reported and compared. Another important factor is the hydrophobicity of the membrane which can affect the specific resistance of the cake. Hydrophobic GVHP and hydrophilic GVWP microfiltration membranes were used to investigate this phenomenon. Hydrophobic membranes provide a stronger interaction between the membrane surface and latex particles. This interaction is less in the case of hydrophilic membranes due to the chemical treatment of the membrane surface to produce hydrophilicity. However, higher adsorption of the latex particles on the membrane surface causes higher specific resistance of the latex cake.

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