Thin-Film Polydiacetylenes of a Stable Blue Phase Based on Symmetric and Asymmetric Diacetylene N-Arylcarbamates

The conditions and specific features of the formation of Langmuir monolayers of symmetric and asymmetric diacetylene N-arylcarbamates and the structural organization of Langmuir-Schaefer films based on them have been studied. The photopolymerization of monolayer solid films of two types of molecules was monitored using absorption spectroscopy; it demonstrated the transition of diyne molecules to the state of blue-phase polydiacetylenes. The efficiency of solid-phase topochemical polymerization reaction in a film of symmetric diynes turned out to be five times higher than in the film of asymmetric diyne molecules. The monolayer surface morphology before and after UV irradiation was studied by scanning electron microscopy.