Abstract
The surface tensions of aqueous solutions of five polydimethylsiloxane-polyether ABA block copolymers and the interfacial tensions (versus silicone fluid) of aqueous solutions of nine such compounds and their mixtures were measured at room temperature. It was found that the high-siloxane-content copolymers were preferentially adsorbed at the water/air interface, whereas the low-siloxane-content copolymers were preferentially adsorbed at the silicone fluid/water interface. The surface tension results are interpreted in terms of molecular orientation of the copolymers at the water/air interface. The interfacial tension results can best be understood in terms of the balance of the hydrophilic and hydrophobic segments in much the same way as conventional surfactants.
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