Conclusions
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1.
Polydimethylsiloxane (PDMS) forms stable films on aqueous solutions of dioxane, as well as on water.
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2.
On the basis of the temperature dependence of the two-dimensional pressure on the surface of a 50% solution of dioxane in water, the enthalpies and entropies of spreading of the film were calculated, and it was concluded that the molecules have a helical conformation.
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3.
In the transition from water to concentrated solutions of dioxane, the surface potential decreases from 150 m V to 0.
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4.
The rate of formation of a film from the volume phase of PDMS increases greatly in the transition from water to dioxane, while the equilibrium pressure decreases in this case. This is due to spreading of PDMS molecules in the form of helices on the more hydrophobic substrate.
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5.
The concept of a monolayer of high-molecular substances on various substrates was discussed.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 9, pp. 1960–1964, September, 1972.
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Ogarev, V.A., Arslanov, V.V. & Trapeznikov, A.A. Properties of monomolecular films of polydimethylsiloxane at the interface of a dioxane solution and air. Russ Chem Bull 21, 1902–1906 (1972). https://doi.org/10.1007/BF00854602
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DOI: https://doi.org/10.1007/BF00854602