Influence of salts on poly(vinyl methyl ether) at the air/aqueous-solution interface. Part 1.—Spread monolayers
Abstract
Surface isotherms have been determined over the temperature range 277–291 K for poly(vinyl methyl ether) films spread on water and on dilute salt solutions in a Langmuir–Adam surface balance. The results are interpreted in terms of an electrostriction effect in the surface region. Parameters derived from the fitting of theoretical equations of state are related to the electrostriction partial molal volumes of the salts by application of the McDevit–Long theory.