Abstract
New side-chain type liquid crystalline (LC) polymers containing carbazolyl group were synthesized. These polymers contain carbazolyl derivatives, 2-(9-methyl-carbazolyl) benzoate as a part of mesogen, and polymethacrylate, polyester, polymethylsiloxane, polymaleimides as a polymer backbone. The mesomorphic behavior and phase transition temperatures of these polymers were characterized by polarizing optical microscopy and differential scanning calorimetry (DSC) measurements. The LC phases were revealed by X-ray diffraction measurements. Polymethacrylate containing non-substituted carbazolyl moiety exhibited a smectic A1 phase. Polymethacrylates containing nitro-substituted carbazolyl moiety exhibited a smectic Ad phase. The latter one has the high phase transition temperatures and the wide mesomorphic temperature ranges. Polyester derivatives did not show typical LC phases. Polysiloxane derivatives exhibited a smectic A1 phase. The siloxane ring would contribute the stability of the LC phase. Polymaleimide derivative with longer methylene unit in the side chain exhibited a smectic C phase, while polymaleimide derivative with shorter methylene unit in the side chain showed a nematic phase.
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