Abstract
We investigated the molecular orientation of organized molecular films with regard to solid-state structures for newly synthesized comb copolymers with N-vinylcarbazole (NVCz) by X-ray diffraction (XRD), surface pressure-area (pi-A) isotherm and in-plane XRD. In the bulk state, hydrogenated and fluorinated comb copolymers formed side-chain crystals for a two-dimensional lattice spacing of 4.2 and 5.0 A, respectively. In this case, it was suggested that the carbazole rings in the main-chain were arranged in opposition to each other. From the results of the DSC measurements, sharp-shaped melting peaks appeared in the relatively lower temperature side of the thermograms. This result supported the formation of side-chain crystals in the synthesized comb copolymers. These mono layers of the copolymers on the water surface were extremely condensed, except for the fluorocarbon:NVCz = 1:1 copolymer. From the in-plane XRD measurements of multilayers on solids, the changes in the two-dimensional lattice structure of fluorinated comb copolymer films containing NVCz units, as opposed to their bulk state, were confirmed. It seems that these structural changes are caused by the stronger pi-pi interaction between the carbazole rings rather than the van der Waals interaction between fluorocarbons.
