Preparation of ferroelectric liquid crystalline microcapsule with electro-optical response and its application

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We synthesized a ferroelectric liquid crystalline monomer (4- [4'- (7-octeneloxy) benzoyloxy] benzoate-2methylbutylester, OBBM) possessing both carboxyl p-benzolxybenzoate and carboxyl (s) - (-) -2methylbutylester as a mesogenic group in its side chain. The liquid crystalline and styrene monomers were employed to make matrices of microspheres prepared by dispersion, suspension, or emulsion polymerization. In this study, we investigated in detail physicochemical properties, thermo responses, or electro-optical responses on the microspheres possessing liquid crystalline abilities. The ferroelectric liquid crystal monomer OBBM synthesized had a thermotropic liquid crystalline ability, two phase transition temperatures, and the Smectic C^* texture which is characteristic of the ferroelectric liquid crystalline substances. The microspheres prepared also exhibited liquid crystalline ability, and the phase transition temperatures toward the liquid crystalline segments into the microspheres prepared by copolymerizing the liquid crystalline and styrene monomers could be decreased with increasing styrene monomer. Furthermore, we found that the microspheres remarkably exhibited electro-optical responses at about 10 volt.