Polydiethylethylhydrosiloxane (PDEHS) in monolayers on a water/air interface in the presence of acids and alkalis is hydrolyzed with the formation of more surface-active products. In the case of hydrolysis, the≡Si-H groups of the oligomer are affected first.
The high sensitivity of PDEHS to the presence of H+ and OH− ions in the substrate permits us to assume that on the surface of glass, which is not, as a rule, neutral, appreciable hydrolysis of PDEHS molecules may occur.
A change in the pH of the substrate leads to correlated changes in the pressure in a monolayer of PDEHS and the wettability by water of such layers, transferred to glass by the Langmuir method.
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The authors would like to thank N. P. Sokolov and N. V. Fedorchenko for obtaining and discussing the IR spectra and V. V. Severnyi for providing the sample of PDEHS.
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Rudoi, V.M., Ogarev, V.A. & Trapeznikov, A.A. Properties of monolayers of polydiethylethylhydrosiloxane at interfaces. Russ Chem Bull 23, 317–320 (1974). https://doi.org/10.1007/BF00924677
- Correlate Change
- Langmuir Method