Surface Viscosity of Monomolecular Films of Long-Chain Aliphatic Amides, Amines, Alcohols, and Carboxylic Acids

摘要

The surface viscosities of monomolecular films of 14-, 16-, and 18-carbon aliphatic alcohols, amines, acids, and amides were determined from the rate of flow of the film material through a narrow and relatively deep viscometer canal. The surface viscosities were measured as functions of film pressure, substrate pH, and the rate of flow of the film. The surface viscosity data for alcohols and acids were in good agreement with those previously reported viscosity values also determined by the canal technique. The values determined with a canal viscometer are often an order of magnitude less than those obtained with other types of viscometers. There are no corresponding data available in the literature with which to compare the surface viscosities of the amide and amine monolayers. Experiments were also carried out for distinguishing between Newtonian and non-Newtonian behavior in the monolayers. (Author)