Abstract
Morphological variation of diacetylene monolayers during solid-state polymerization was investigated by in-situ observation at the air-water interface. For the first time, use of the circular polarized light detection scheme enables observation of the monomer monolayer of diacetylene. We revealed that the spiral structure of the monolayer is already formed even before the polymerization. The surface structure of the monolayer during the polymerization process by UV irradiation was recorded in both air and argon atmospheres. In the argon atmosphere, the surface morphology remains constant during polymerization. On the other hand, a large deformation was found in the unit cell in the presence of oxygen (air). Attempts have been made to establish a molecular model for the monolayer using molecular mechanics calculations.
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