MIXED MONOLAYERS AND MULTILAYERS OF POLY(ISOCYANIDE)S WITH NONLINEAR OPTICALLY-ACTIVE SIDE-CHAINS

The properties and structure of Langmuir-Blodgett mono- and multilayer s of several poly(isocyanide)s with non-linear optically active side-c hains were studied. These polymers formed very rigid layers or layers which appeared to be unstable. To circumvent this problem they were mi xed with other poly(isocyanide)s or with amylose-butyrate. Transmissio n electron microscopy studies of the polymeric mixtures revealed that phase separation occurred in all cases and that only poly(isocyanide)s substituted with hydrophilic side chains formed monomolecular layers. Depending on the nature of the polymer which was used for mixing, the dye polymers could be deposited with Y- or Z-type transfer. Second-ha rmonic intensities generated from these films were small in the case o f the Y-type multilayered films and moderately high in the case of the Z-type films.