With Asymmetric Mesogenic Crustacean-type Poly P-phenylene Design And Synthesis

The 21st century is the information age, optical information processing, display and storage can be accomplished with polarized light source, the polarized light can be achieved by two kinds of mechanisms: the passive and active way. At present the polarized light system of the liquid-crystal display mainly is a linearly polarized light. Circular polarized light sources as well as linearly polarized light sources have proven themselves indispensable in modern display technologies. Compared with the linearly polarized light monitor, Circular polarized light has the quite high brightness, nearly 100% utilization ratio of the photo source, and so on. At present, the reports of circularly polarized light illumination component are too few, the primary reason is there are few materials with circularly polarized light. In order to get new materials with circularly polarized electroluminescence by effective and convenient way, a new method was proposed through designing the mesogen-jacketed type liquid crystalline conjugated polymers with asymmetry mesogenic units.The asymmetry mesogenic unit was designed with large dipole moment to favor it tropism under the electric field and have a regular orientation in one direction. This kind of orientation will forced the polymer chain to form a single screw direction, (induction of one-handed helix sense) As a result, the polymer will show chiroptical properties.1H-NMR, IR, MS, GPC, DSC, UV-vis spectrum, FL spectrum and POM was used to characterize the intermediate product, polymer chemical constitution, the relative molecular weight, and optical propertied of the polymers. The relationship between the carapace density and the thermal and optical propertied of polymers was also studies.1H-NMR, IR, MS results confirm that the structures of all intermediate product are correct. POM and DSC results indicated that both the monomer and the polymer form the liquid crystalline state when heated above their glass transition temperature. The morphology of the polymers has strong effect on the optical properties of the polymers. Polymers have a blue photoluminescence emission in chloroform solution, the spin films and annealed films of the polymers have large red shifted compared with that of the chloroform solution and show a yellow emission. The red -shift is increase when the carapace densities decrease.