[19a-211A-1~10] 12.3 Functional Materials and Novel Devices

[19a-211A-10] Alignment Control of Long-Range Ordered Lamellar Structure Formed by Random Copolymers with Liquid Crystalline Azobenzene and POSS Side-Chain Units

〇Shusaku Nagano¹, Miho Nagai², Mitsuo Hara², Takahiro Seki² (1.Nagoya Univ. VBL, 2.Nagoya Univ.)

Keywords:side-chain liquid crystal polymer, silsesquioxane, random copolymer

Random copolymers with azobenzene and polyhedral oligomeric silsesquioxane (POSS) side chains were synthesized. The liquid crystalline structure of the random copolymers was analyzed by X-ray scattering measurement in a bulk state. The copolymers exhibited the first order peak at 6.1 nm with several highly ordered peaks at regular intervals, indicating that the copolymers formed a highly ordered lamellar structure in smectic phase. The azobenzene homopolymer adopts the smectic phase with ca. 3 nm of the smectic lamellar spacing, and the POSS homopolymer exhibits an amorphous phase. The copolymers exhibited high smectic lamellar ordering with large spacing. We presume that the unexpectedly highly ordered lamellar structure of the copolymers is formed by nano-segregation between the azobenzene smectic layers and POSS layers.