Abstract
Surface-active n-alkylthiooligooxyethylene glycols C n H 2n+1 SCH 2CH 2(OCH 2CH 2) z OH ( n=4–9; z=0–3) were synthesized and equilibrium surface tension-concentration isotherms of aqueous solutions of these individual substances at 25°C determined. The experimental values of surface tension were well described by a simplified form of Temkin's isotherm. A quantitative correlation has been found between the standard free energy of adsorption Δ G 0 π and the structure of the studied sulfides by using a new empirical adsorption equation. It has been found that the thioethylene group, -SCH 2CH 2-, is hydrophobic. The standard free energy contribution, Δ G 0 π[-SCH 2CH 2-] is not constant. The change of this value from − 0.5 to − 1.9 RT with the change of surface pressure π from 0 to 25 mN m −1 is discussed.
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