Interactions droplets with adsorbed polymer layers

Absolute porosity, definition, 220 Absolute viscosity, definition, 386 Acid number (total acid number, TAN), definition, 403 Adhesion, definition, 26-27 Adsorbed polymer layers, interaction with droplets, 62 Adsorption definition, 386... 

When two particles or droplets each with a radius R and containing an adsorbed surfeictant or polymer layer with a hydrodynamic thickness 8 approach each other to a surfeice-surfece separation distance of h that is smaller than 28, the surfactant or polymer layers interact with each other resulting in two main conditions The polymer chains may overlap with each other or the polymer layers may undergo compression. In both cases there will be an increase in the local segment density of the chains in the interaction region.This is schematically illustrated in Fig. 2.6. 

Interaction of Droplets with Adsorbed Polymer Layers. In the... 

The DLVO theory does not explain either the stability of water-in-oil emulsions or the stability of oil-in-water emulsions stabilized by adsorbed non-ionic surfactants and polymers where the electrical contributions are often of secondary importance. In these, steric and hydrational forces, which arise from the loss of entropy when adsorbed polymer layers or hydrated chains of non-ionic polyether surfactant intermingle on close approach of two similar droplets, are more important (Fig. 4B). In emulsions stabilized by polyether surfactants, these interactions assume importance at very close distances of approach and are influenced markedly by temperature and degree of hydration of the polyoxyethylene chains. With block copolymers of the ethylene oxide-propylene oxide... 

The study of polymeric surfactants as emulsion stabilizers, the interaction between the emulsion droplets with adsorbed polymer layers, is an interesting topic. Our... 

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