Title

Electrosteric Stabilization of Oil-in-Water Emulsions by Hydrophobically Modified Poly(acrylic acid) Thickeners

Document Type

Article

Publication Date

5-13-1991

Department

Polymers and High Performance Materials

Abstract

Hydrophobic modification of poly(acrylic acid) thickeners yields products that are useful as primary emulsifiers for oil-in-water systems. The resulting emulsions are stable for years, but they break and coalesce almost instantly when a sufficient concentration of electrolyte is introduced into the aqueous phase. The effect of electrolytes on these electrosterically stabilized emulsions is complex. The polymer is anchored to the oil droplet by hydrophobic interaction. Such anchoring should theoretically be strengthened by the presence of water-structure-enhancing electrolytes. On the other hand, coulombic interaction between the electrolyte and the polyelectrolyte causes shrinkage of the overall polyelectrolyte configuration and this should theoretically make coalescence more likely.

Publication Title

ACS Symposium Series

Volume

462

First Page

101

Last Page

120

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