サーモトロピック液晶性とプロトン伝導性を両立するアゾベンゼン高分子の調製と光配向

抄録

By RAFT polymerization, we prepared side-chain liquid crystalline block copolymers, PHMA-b-P(Az-co-AA), connected P(Az-co-AA) to poly(hexyl methacrylate) (PHMA). Evaluating the synthesized block copolymers of the composition by NMR, we could obtain PHMA100-b-P(Az34-co-AA52) and PHMA50-b-P(Az36-co-AA84). The volume fractions of P(Az-co-AA) block (ΦAz-AA) in two block copolymers were 0.53 and 0.75, respectively. The LC orientations of two block copolymer thin films were analyzed by UV-vis absorption spectroscopy. After annealing, the absorption band due to the mesogenic Az decreased in PHMA50-b-P(Az36-co-AA84) film. This indicates the homeotropic orientation of the mesogenic group in thin films. On the other hand, in PHMA100-b-P(Az34-co-AA52) film, the absorbance of the band was almost unchanged, suggesting that PHMA100-b-P(Az34-co-AA52) adopts the random planar orientation in a thin film.