Abstract
Surface pressure-area measurements are reported for a number of polymers and for 4-cyano-4-n-pentyl-p-terphenyl (T15). Additionally the flow of the condensed films has been measured by applying lines of sulphur powder to the surface. This shows whether or not the film is homogeneous, and how it can be affected by a plateau in the pressure-area curve and by a glass plate in the interface. Measurements on poly(γ-methyl- L-glutamate) confirm earlier work on α-helical synthetic polypeptides. Poly(butyl methacrylate) monolayers are reversible in their behaviour, but are affected by a plate in the interface. T15 shows non-homogeneous behaviour over the range of the plateau in the pressure-area curve, followed by collapse of the film. Some implications of the observations in relation to instrument design and experimental studies are pointed out.
Published Version
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