Abstract
Binary mixed monolayers of poly(vinyl stearate) with 1-hexadecanol, 1-octadecanol, and stearic acid at the air/water interface were studied using pressure-area isotherms and resistance to water evaporation. All of these two-dimensional polymer solutions were homogeneous, but showed marked deviations from ideality. Negative values of excess free energy of mixing ( ΔG ex ) indicated condensation effect and the increase in excess free energy of activation for water evaporation ( ΔG ex‡ ) was closely correlated with the decrease in ΔG ex . These behaviors are attributed to tight packing of the long-chain alcohols or acid within the free area of the comb-like polymer.
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