COMPLETE AND PARTIAL MISCIBILITY IN BINARY MONOLAYERS OF PHOSPHATIDYLETHANOLAMINES WITH DIFFERENT LENGTHS OF ACYL-GROUPS

A detailed miscibility analysis of the three systems of binary phospho lipid monolayers (system lethanolamine/dipalmitoylphosphatidylethanola mine, system dylethanolamine/distearoylphosphatidylethanolamine and sy stem ylethanolamine/distearoylphosphatidylethanolamine) was carried ou t by application of a variety of spreading and surface techniques to p roduce mixed monolayers in different mixing states. Studies of the com pression and spreading behavior of these binary systems and the applic ation of the surface-phase rule form a basis for the determination of binary phase diagrams. From these phase diagrams of the binary monolay ers we can analyze and compare the miscibility properties in the mixed films. We found complete or partial miscibility in the binary monolay ers in dependence on the film state (liquid-expanded or condensed film s) and the chain length differences between the mixing components.