Side Chain Ferroelectric Liquid Crystalline Conjugated Polymers: Textures under Polarizing Optical Microscope

摘要

Novel liquid crystalline (LC) polyacetylene derivatives were synthesized to develop advanced LC conducting polymers with an ability of quick response to an electric field used as an external force. In practice, we synthesized ferroelectric LC (FLC) conducting polymers by introducing fluorine-containing chiral LC groups into side chains of polyacetylenes. Phase transition behaviors of these polymers were examined by differential scanning calorimetry and polarizing optical microscopy. Mesophases as well as higher order structures were evaluated with X-ray diffraction (XRD) measurements. All of the polymers exhibited mesophases in the heating and cooling processes. Two of the polymers synthesized showed twist grain boundary A (TGB_A~*) and chiral smectic C (S_c~*) phases in the heating and cooling processes. The temperature range of the S? phase was wider than 50" in the cooling process. The observation of the S_c~* phase allowed us to expect that the polymer would exhibit the ferroelectricity.