Column preparation contact angle

Table II presents the results of some wettability measurements on adsorbed monolayers prepared from molten Compound D on pure, polished, clean, chromium surfaces after solvent treatment had been used to remove all surplus solidified acid. A series of successive solvent treatments was applied to each coated specimen (see first four columns of Table II) using liquids which have been shown to be good solvents for Compound in the bulk (9). These liquids were either absolute ethyl alcohol or benzene at or above 20°C., or n-hexane at or above 60°C. In the remaining columns are listed the average values of the slowly advancing contact angles measured by the drop-buildup method on from three to five different drops. Measurements were made on sessile drops of water, thiodiglycol, and methylene iodide. These three diagnostic liquids were chosen because of their high surface tensions (72.8, 54.0,...

Besides being added to aqueous solutions of PAM, additive VIII was also added to a solution of the acrylamide monomer prior to polymerization. After polymerization, the PAM was purified as described earlier and films were prepared by solvent evaporation with no further addition of surface active additive VIII. The contact angles given in the last column of Table V for the organic liquids on this film correspond, within the limits of experimental error, to those obtained... 

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