Langnmir films of poly(o-toluidine) and poly(o-methoxyaniline) at the water-air interfacet

The behaviour of monomolecular layers prepared on a liquid surface may be considered as a limiting case of adsorption. In the present work, measurements of surface-pressure isotherms have been used to examine the effect of the solvent (tetrahydrofuran, chloroform) and polymer concentration on the formation of poly(o-toluidine) (PoTI) and poly(o-methoxyaniline) (PoMA) monolayers at the water surface. The PoTl monolayer exhibited a hysteresis loop when the PoMA and PoTl monolayers were studied under compression/ expansion conditions. In contrast, the mobility of the monomer units in the PoMA films formed at the water surface enabled them to rapidly restore their structure.