Effect of Sodium Dodecyl Sulfate on Deposition of Polymer Latices onto Polyester and Cotton Fibers

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Abstract
The deposition of polystyrene and poly(methyl methacrylate) latices onto polyester and cotton fibers in the presence of sodium dodecyl sulfate (SDS) was studied. The deposition rates were obtained as functions of pH and SDS concentration by immersing the fiber in latex dispersion without agitation. The results are considered in terms of an electrostatic and van der Waals interaction (heterocoagulation theory). The de position onto polyester fiber at an SDS concentration below critical micell concen tration is influenced by the electrostatic and van der Waals interaction, and at an SDS concentration above critical micell concentration, steric repulsions caused by the sur factant that is adsorbed seem to influence the deposition. No deposition was observed on cotton fibers, even at low SDS concentrations below critical micell concentration. This suggests the presence of steric effects at the surface of cotton fibers.