PB19 Bibenzoateをメソゲン基とする主鎖型液晶エラストマーの変形挙動と配向秩序パラメータ(液晶化学材料,ポスター発表,2015年日本液晶学会討論会)

• Published in: Proceedings of Japanese Liquid Crystal Society Annual meeting Vol. 2015; pp. PB19-1 - PB19-2
• Main Authors: 住友, 昌平, 齊藤, 由香里, 佐藤, 茜, 篠崎, 凌, 平岡, 一幸
• Format: Journal Article
• Language: Japanese
• Published: 一般社団法人 日本液晶学会 2015; THE JAPANESE LIQUID CRYSTAL SOCIETY
• ISSN: 1880-3490; 2432-5988
• DOI: 10.11538/ekitou.2015.0__PB19

We have prepared uniaxially oriented main-chain liquid-crystalline elastomers composed of BB-n smectic polyesters with trifunctional cross-linkers and reported the deformation behaviour in a cyclic heating-cooling process, where successive phase transformations occur. Although the elastomer contracted by about 650 % on heating from room temperature to the isotropic phase, the sample length recovered by 450 % on cooling to room temperature in the first heating-cooling process. We have observed that the elastomer once exposed to the isotropic phase exhibited reversible shrinkage and elongation, estimated at about 450 %, during the transformation between the isotropic and liquid-crystalline phases. In addition, X-ray analysis has revealed that the cybotactic nematic state emerges in the oriented main-chain liquid-crystalline composed of the smectic polyesters. Moreover, we have confirmed that the magnitude of deformation of the elastomers is non-linearly coupled with the orientational order parameter estimated by X-ray scattering observation.